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Plesiosaurs

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Plesiosaurs


Temporal range: Early Jurassic - Late Cretaceous, 199.6–65.5Ma
Artist's reconstruction of Plesiosaurus.
Suborders

Plesiosauroidea
Pliosauroidea

Plesiosauria (/ˌplsi.ɵˈsɔriə/; Greek: plesios meaning 'near to' and sauros meaning 'lizard') is an order of Mesozoic marine reptiles (sauropsida). Plesiosaurs first appeared in the Early Jurassic (and possibly Rhaetian, latest Triassic) Period[1] and became especially common during the Jurassic Period, thriving until the Cretaceous–Paleogene extinction at the end of the Cretaceous Period. They had a worldwide distribution.

The name "plesiosaur" is used to refer to the order Plesiosauria as a whole, not only to the long-necked forms (suborder Plesiosauroidea). These latter constitute the plesiosaurs in the popular imagination ("Nessie", "Nahuelito").

Description

The typical plesiosaur had a broad, flat, body and a short tail. Plesiosaurs retained their ancestral two pairs of limbs, which had evolved into large flippers.[2] Plesiosaurs were related to the earlier Nothosauridae,[3] that had a more crocodile-like body. The flipper arrangement is unusual in aquatic animals in that probably all four limbs were used to propel the animal through the water by up-and-down movements. The tail was most likely only used for helping in directional control. This situation is in contrast to that of the ichthyosaurs and the later mosasaurs, in which the tail provided the main propulsion.

To power the flippers, the shoulder girdle and the pelvis had been greatly modified, developing into broad bone plates at the underside of the body, that served as an attachment surface for large muscle groups, able to pull the limbs downwards. In the shoulder the coracoid had become the largest element covering the major part of the breast. The scapula was much smaller, forming the outer front edge of the trunk. To the middle it continued into a clavicle and finally a small interclavicular bone. As with most tetrapods, the shoulder joint was formed by the scapula and coracoid. In the pelvis, the bone plate was formed by the ischium at the rear and the larger pubic bone in front of it. The ilium, that with land vertebrates bears the weight of the hindlimb, had become a small element at the rear, no longer attached to either the pubic bone or the thighbone. The hip joint was formed by the ischium and pubic bone. The pectoral and pelvic plates were connected by a plastron, a bone cage formed by the paired belly ribs that each had a middle and an outer section. This arrangement immobilised the entire trunk.

To become flippers, the limbs had changed considerably. The limbs were very large, each about as long as the trunk. The forelimbs and hindlimbs strongly resembled each other. The humerus in the upper arm, and the thigbone in the upper leg, had become large flat bones, expanded at their outer ends. The elbow joints and the knee joints were no longer functional: the lower arm and the lower leg could not flex in relation to the upper limb elements but formed a flat continuation of them. All outer bones had become flat supporting elements of the flippers, tightly connected to each other and hardly able to rotate, flex, extend or spread. This was true of the ulna, radius, metacarpals and fingers, as well of the tibia, fibula, metatarsals and toes. Furthermore, in order to elongate the flippers, the number of phalanges had increased, up to eighteen in a row, a phenomenon called hyperphalangy. The flippers were not perfectly flat but had a lightly convexly curved top profile, like an airfoil, to be able to "fly" through the water.

While plesiosaurs varied little in the build of the trunk, and can be called "conservative" in this respect, there were major differences between the subgroups as regarded the form of the neck and the skull. Plesiosaurs can be divided into two major morphological types that differ in head and neck size. "Plesiosauromorphs", such as Cryptoclididae, Elasmosauridae, and Plesiosauridae, had long necks and small heads. "Pliosauromorphs" such as the Pliosauridae and the Rhomaleosauridae had shorter necks with a large, elongated head. The neck length variations were not caused by an elongation of the individual neck vertebrae but by increasing the number of these cervical vertebrae. Elasmosaurus has seventy-two neck vertebrae; the known record is held by the elasmosaurid Albertonectes, with seventy-six cervicals.[4] The large number of joints implied, suggested to early researchers that the neck must have been very flexible. Especially a swan-like curvature of the neck was assumed to be possible; in Icelandic plesiosaurs are even called Svaneðlur. "swan lizards". However, modern research has confirmed an earlier conjecture of Williston that the long plate-like spines on top of the vertebrae, the processus spinosi, strongly limited a vertical movement. Although horizontal curving was less restricted, in general the neck must have been rather stiff and certainly was incapable of being bent into serpentine coils. This is even more true of the short-necked "pliosauromophs" that had as little as eleven cervicals. With early forms the amphicoelous or amphiplat neck vertebrae bore double-headed neck ribs; later forms had single-headed ribs.


In general, plesiosaurians are among the largest marine predators in the fossil record, with even the smallest species around two metres (6.5 ft) long. The largest pliosaurids were up to seventeen metres long,

The anteriorly placed internal nostrils have palatal grooves to channel water, the flow of which would be maintained by hydrodynamic pressure over the posteriorly placed external nares during locomotion. During its passage through the nasal ducts, the water would have been 'tasted' by olfactory epithelia.[5]

History of discovery

Early finds

Skeletal elements of plesiosaurs are among the first fossils of extinct reptiles recognised as such. In 1605, Richard Verstegen of Antwerp illustrated in his A Restitution of Decayed Intelligence plesiosaur vertebrae that he referred to fishes and saw as proof that Great Britain was once connected to the European continent.[6] The Welshman Edward Lhuyd in his Lithophylacii Brittannici Ichnographia from 1699 also included depictions of plesiosaur vertebrae that again were considered fish vertebrae or Ichthyospondyli.[7] Other naturalists during the seventeenth century added plesiosaur remains to their collections, such as John Woodward; these were only much later understood to be of a plesiosaurian nature and are today partly preserved in the Sedgwick Museum.[8]

In 1719, William Stukeley described a partial skeleton of a plesiosaur, which had been brought to his attention by the great-grandfather of Charles Darwin, Robert Darwin of Elston. The stone plate came from a quarry at Fulbeck and had been used, with the fossil at its underside, to reinforce the slope of a watering-hole in Elston. After the strange bones it contained had been discovered, it was displayed in the local vicarage as the remains of a sinner drowned in the Great Flood. Stukely affirmed its "diluvial" nature but understood it represented some sea creature, perhaps a crocodile or dolphin.[9] The specimen is today preserved in the Natural History Museum, its inventory number being BMNH R.1330. It is the earliest discovered more or less complete fossil reptile skeleton in a museum collection. It can perhaps be referred to Plesiosaurus dolichodeirus.[8]

During the eighteenth century, the number of English plesiosaur discoveries rapidly increased, although these were all of a more or less fragmentary nature. Important collectors were the reverends William Mounsey and Baptist Noel Turner, active in the Vale of Belvoir, whose collections were in 1795 described by John Nicholls in the first part of his The History and Antiquities of the County of Leicestershire.[10] One of Turner's partial plesiosaur skeletons is still preserved as specimen BMNH R.45 in the British Museum of Natural History; this is today referred to Thalassiodracon.[8]

Plesiosaurus is named

In the early nineteenth century plesiosaurs were still poorly known and their special build was not understood. No systematic distinction was made with ichthyosaurs so the fossils of one group were sometimes combined with those of the other to obtain a more complete specimen. In 1821, a partial skeleton discovered in the collection of Colonel Thomas James Birch,[11] was described by William Conybeare and Henry Thomas De la Beche, and recognised as representing a distinctive group. A new genus was named, Plesiosaurus. The generic name was derived from the Greek πλήσιος, plèsios, "closer to" and the Latinised saurus, in the meaning of "saurian", to express that Plesiosaurus was in the Chain of Being more closely positioned to the Sauria than Ichthyosaurus which had the form of a more lowly fish.[12] The name should thus be rather read as "approaching the Sauria" than as "near lizard". Parts of the specimen are still present in the Oxford University Museum of Natural History.[8]

Soon afterwards, the morphology became much better known. In 1823, Thomas Clark reported an almost complete skull, probably belonging to Thalassiodracon, which is now preserved by the British Geological Survey as specimen BGS GSM 26035.[8] The same year, commercial fossil collector Mary Anning and her family uncovered an almost complete skeleton at Lyme Regis in Dorset, England, on what is today called the Jurassic Coast. It was acquired by the Duke of Buckingham, who made it available to the geologist William Buckland. He in turn let it be described by Conybeare on 24 February 1824 in a lecture to the Geological Society of London,[13] during the same meeting in which for the first time a dinosaur was named, Megalosaurus. The two finds revealed the unique and bizarre build of the animals, in 1832 by Professor Buckland likened to "a sea serpent run through a turtle". In 1824, Conybeare also provided a specific name to Plesiosaurus: dolichodeirus, "longneck". In 1848, the skeleton was bought by the British Museum of Natural History and catalogued as specimen BMNH 22656.[8] When the lecture was published, Conybeare also named a second species: Plesiosaurus giganteus. This was a short-necked form later assigned to the Pliosauroidea.

Plesiosaurs became better known to the general public through two lavishly illustrated publications by the collector Thomas Hawkins: Memoirs of Ichthyosauri and Plesiosauri of 1834[14] and The Book of the Great Sea-Dragons of 1840. Hawkins entertained a very idiosyncratic view of the animals, seeing them as monstrous creations of the devil, during a pre-Adamitic phase of history.[15] Hawkins eventually sold his valuable and attractively restored specimens to the British Museum of Natural History.

During the first half of the nineteenth century the number of plesiosaur finds steadily increased, especially through discoveries in the sea cliffs of Lyme Regis. Sir Richard Owen alone named nearly a hundred new species. The majority of their descriptions were, however, based on isolated bones, without sufficient diagnosis to be able to distinguish them from the other species that had previously been described. Many of the new species described at this time have subsequently been invalidated. The genus Plesiosaurus is particularly problematic as the majority of the new species were placed in it so that it became a wastebasket taxon. Gradually, other genera were named. Hawkins already created new genera, though these are no longer seen as valid. In 1841, Owen named Pliosaurus brachydeirus. Its etymology referred to the earlier Plesiosaurus dolichodeirus as it is derived from πλεῖος, pleios, "more fully", reflecting that according to Owen it was closer to the Sauria than Plesiosaurus. Its specific name means "with a short neck".[16] Later, the Pliosauridae were recognised as having a morphology fundamentally different from the plesiosaurids. A family Plesiosauridae had already been coined by John Edward Gray in 1825.[17] In 1835, Henri Marie Ducrotay de Blainville named the order Plesiosauria itself.[18]

American discoveries

In the second half of the nineteenth century, important finds were made outside of England. This included some German discoveries, but mainly plesiosaurs found in the sediments of the American Cretaceous Western Interior Seaway, the Niobrara Chalk. One fossil in particular marked the start of the Bone Wars between the rival paleontologists Edward Drinker Cope and Othniel Charles Marsh. In 1867, physician Theophilus Turner near Fort Wallace in Kansas uncovered a plesiosaur skeleton which he donated to Cope.[19] Cope attempted to reconstruct the animal on the assumption the longer extremity of the vertebral column was the tail, the shorter one the neck. He soon noticed that the skeleton taking shape under his hands had some very special qualities: the neck vertebrae had chevrons and with the tail vertebrae the joint surfaces were orientated back to front.[20] Excited, Cope concluded to have discovered an entirely new group of reptiles: the Streptosauria or "Turned Saurians" which would be distinguished by reversed vertebrae and a lack of hindlimbs, the tail providing the main propulsion.[21] After having published a description of this animal,[22] followed by an illustration in a text book about reptiles and amphibians,[23] Cope invited Marsh and Joseph Leidy to admire his new Elasmosaurus platyurus. Having listened to Cope's interpretation for a while, Marsh suggested that a simpler explanation of the strange build would be that Cope had reversed the vertebral column relative to the body as a whole. When Cope reacted indignantly to this suggestion, Leidy silently took the skull and placed it against the presumed last tail vertebra to which it fitted perfectly: it was in fact the first neck vertebra, with still a piece of the rear skull attached to it.[24] Mortified, Cope tried to destroy the entire edition of the text book and when this failed, immediately published an improved edition with a correct illustration but an identical date of publication.[25] He excused his mistake by claiming that he had been mislead by Leidy himself, who, describing a specimen of Cimoliasaurus, had also reversed the vertebral column.[26] Marsh later claimed that the affair was the cause of his rivalry with Cope: "he has since been my bitter enemy". Both Cope en Marsh in their rivalry named many plesiosaur genera and species, most of which are today considered invalid.

Around the turn of the century, most plesiosaur research was done by a former student of Marsh, Professor Samuel Wendell Williston. In 1914, Williston published his Water reptiles of the past and present.[27] Despite treating sea reptiles in general, it would for many years remain the most extensive general text on plesiosaurs. In 2013, a first modern text book was being prepared by Olivier Rieppel. During the middle of the twentieth century, the USA remained an important centre of research, mainly through the discoveries of Samuel Paul Welles.

Recent discoveries

Whereas during the nineteenth and most of the twentieth century, new plesiosaurs were described at a rate of three or four genera each decade, the pace suddenly picked up in the 1990s, with seventeen plesiosaurs being discovered in this period. The tempo of discovery accelerated in the early twenty-first century, about three or four plesiosaurs being named each year.[28] This implies that about half of the known plesiosaurs are relatively new to science, a result of a far more intense field research. Some of this is taking place away from the traditional areas, e.g. in new sites developed in New Zealand, Argentine, Norway, China and Morocco, but the locations of the more original discoveries have proven to be still productive, important new finds having been made in England and Germany. Some of the new genera are a renaming of already known species, that were deemed sufficiently different to warrant a separate genus name.

In 2002, the "Monster of Aramberri" was announced to the press. Discovered in 1982 at the village of Aramberri, in the northern Mexican state of Nuevo León, it was originally classified as a dinosaur. The specimen is actually a very large plesiosaur, possibly reaching 15 m (49 ft) in length. The media published exaggerated reports claiming it was 25 metres (82 ft) long, and weighed up to 150,000 kilograms (330,000 lb), which would have made it the largest predator of all time. This error was dramatically perpetuated in BBC's documentary series Walking with Dinosaurs, which also prematurely classified it as a Liopleurodon ferox.

In 2004, what appears to be a completely intact juvenile plesiosaur was discovered, by a local fisherman at Bridgwater Bay National Nature Reserve in Somerset, UK. The fossil, dated 180 Ma by the ammonites associated with it, measured 1.5 metres (4 ft 11 in) in length, and may be related to Rhomaleosaurus. It is probably the best preserved specimen of a plesiosaur yet discovered.[29][30][31]

In 2006, a combined team of American and Argentinian investigators (the latter from the Argentinian Antarctic Institute and the La Plata Museum) found the skeleton of a juvenile plesiosaur measuring 1.5 metres (4 ft 11 in) in length on Vega Island in Antarctica.[32] The fossil is currently on display as the geological museum of South Dakota School of Mines and Technology.

In 2008, fossil remains of an undescribed plesiosaur that was named Predator X, now known as Pliosaurus funkei, were unearthed in Svalbard.[33] It had a length of 12 m (39 ft),[33] and its bite force of 149 kilonewtons (33,000 lbf) is one of the most powerful known.[34]

Not only has the number of field discoveries increased, plesiosaurs have also since the 1950s been the subject of more extensive theoretical work. The new method of cladistics allowed for the first time to exactly calculate their evolutionary relationships. Several hypotheses have been published about the way they hunted and swam, incorporating general modern insights about biomechanics and ecology. The many recent discoveries have tested these hypotheses and given rise to new ones. The increasing scientific interest in the group has been called a "plesiosaur renaissance".

Evolution


The Plesiosauria have their origins within the Sauropterygia, a group of lepidosauromorph reptiles that returned to the sea. An advanced sauropterygian subgroup, the carnivorous Eusauropterygia with small heads and long necks, during the Upper Triassic split into two branches. One of these, the Nothosauroidea, retained functional elbow and knee joints, but the other, the Pistosauria, more fully adapted to a sea-dwelling lifestyle. Their vertebral column became stiffer and the main propulsion while swimming was no longer provided by the tail but by the limbs that changed into flippers.[35] The Pistosauria became warm-blooded and viviparous, giving birth to live young.[36] Early, basal, members of the group, traditionally called "pistosaurids", still were largely coastal animals. Their shoulder girdles remained weak, their pelves could not power a strong swimming stroke and their flippers were blunt. Later a more advanced pistosaurian group split off: the Plesiosauria. They had reinforced shoulder girdles, flatter pelves and more pointed flippers. Other adaptations allowing to colonise the open seas included stiff limb joints; an increase in the number of phalanges of the hand and foot; a tighter lateral connection of the finger and toe phalanx series and a shortened tail.

From the earliest Jurassic, the Hettangian stage, a rich radiation of plesiosaurs is known, implying that the group must already have diversified in the Late Triassic; of this diversification only a few very basal forms have actually been discovered, however. The subsequent evolution of the plesiosaurs is very contentious. The various cladistic analyses have not resulted in a consensus about the relationships between the main plesiosaurian subgroups. Traditionally, plesiosaurs have been divided into the long-necked plesiosauroidea and the short-necked pliosauroidea. However, modern research suggests that some generally long-necked groups might have had short-necked members. To avoid a confusion between the phylogeny, the evolutionary relationships, and the morphology, the way the animal is built, long-necked forms are therefore called "plesiosauromorph" and short-necked forms are called "pliosauromorph", without the "plesiosauromorph" species necessarily being more closely related to each other than to the "pliosauromorph" forms.[37]

The latest common ancestor of the Plesiosauria was probably a rather small short-necked form. During the earliest Jurassic, the most speciose subgroup were the Rhomaleosauridae, a possibly very basal split-off of species which were also short-necked. Plesiosaurs in this period were at most five metres long. By the Toarcian, about 180 million years ago, other groups, among them the Plesiosauridae, became more numerous and some species developed longer necks, resulting in total body lengths of up to ten metres.[38]

In the middle of the Jurassic, very large Pliosauridae evolved, characterized by a large head and a short neck, such as Liopleurodon and Simolestes. These forms had skulls up to three metres long and reached a length of up to seventeen metres and a weight of ten tonnes. The pliosaurids had large, conical teeth and were the dominant marine carnivores of their time. During the same time, approximately 160 million years ago, the Cryptoclididae were present, shorter species with a long neck and a small head.

During the Early Cretaceous at first the Leptocleididae radiated, rather small forms that despite their short necks might have been more closely related to the Plesiosauridae than to the Pliosauridae. Later in the Early Cretaceous, the Elasmosauridae appeared, that were among the longest plesiosaurs, reaching up to fifteen metres in length by virtue of extremely elongated necks containing as much as seventy-six vertebrae, more than any other known vertebrate. Pliosauridae were still present as is shown by large predators as Kronosaurus.

At the beginning of the Late Cretaceous the Ichthyosauria became extinct; perhaps a plesiosaur group evolved to fill their niches: the Polycotylidae that had short necks and peculiarly elongated heads with narrow snouts. During the Late Cretaceous the elasmosaurids remained very speciose.

All plesiosaurs became extinct as a result of the K-T event at the end of the Cretaceous period, approximately 66 million years ago.

Classification

Taxonomy


The taxonomy presented here is mainly based on the plesiosaur cladistic analyses proposed by Ketchum and Benson, 2011 and Benson et al., 2012 unless otherwise noted.[39][38] In this rank-based list, the traditional suborders Plesiosauroidea and Pliosauroidea are maintained but the short-necked Leptocleididae and Polycotylidae, which traditionally had been seen as Pliosauroidea, have been placed in the Plesiosauroidea, reflecting their evolutionary position according to these studies.

Phylogeny

In modern phylogeny, clades are defined, groups that contain all species belonging to a certain branch of the evolutionary tree. One way to define a clade is to let it consist of the last common ancestor of two such species and all its descendants. Such a clade is called a "node clade". In 2008, Patrick Druckenmiller and Anthony Russell in this way defined Plesiosauria as the group consisting of the last common ancestor of Plesiosaurus dolichocheirus and Peloneustes philarchus; and all its descendants.[40] Plesiosaurus and Peloneustes represented the main subgroups of the Plesiosauroidea and the Pliosauroidea and were chosen for historical reasons; any other species from these groups would have sufficed.

Another way to define a clade is to let it consist of all species more closely related to a certain species that one in any case wishes to include in the clade, than to another species that one to the contrary desires to exclude. Such a clade is called a "stem clade". Such a definition has the advantage that it is easier to include all species with a certain morphology. Plesiosauria was in 2010 by Hillary Ketchum and Roger Benson defined as such a stem-based taxon: "all taxa more closely related to Plesiosaurus dolichodeirus and Pliosaurus brachydeirus than to Augustasaurus hagdorni". Ketchum and Benson (2010) also coined a new clade Neoplesiosauria, a node-based taxon that was defined by as "Plesiosaurus dolichodeirus, Pliosaurus brachydeirus, their most recent common ancestor and all of its descendants".[41] Neoplesiosauria very likely is materially identical to Plesiosauria sensu Druckenmiller & Russell and was meant to be a replacement of this concept. The following cladogram follows an analysis by Ketchum & Benson, 2011.[39]

 Pistosauria 

"Pistosaurus postcranium"




Augustasaurus hagdorni



Bobosaurus forojuliensis



Pistosaurus



Yunguisaurus liae


 Plesiosauria 
 Pliosauroidea 
 Pliosauridae 

Thalassiodracon hawkinsii




Hauffiosaurus spp.




Attenborosaurus conybeari



advanced pliosaurids





 Rhomaleosauridae 

NHMUK 49202 [now Anningasaura lymense]




advanced rhomaleosaurids




"Plesiosaurus" macrocephalus




Archaeonectrus rostratus



Macroplata tenuiceps







 Plesiosauroidea 

OUMNH J.10337 [now Stratesaurus taylori]



 Plesiosauridae 

Seeleyosaurus guilelmiimperatoris




OUMNH J.28585



Plesiosaurus dolichodeirus






Elasmosauridae and Cryptoclidia




Microcleidus homalospondylus




Hydrorion brachypterygius



Occitanosaurus tournemiensis










Benson et al. (2012) found the traditional Pliosauroidea to be paraphyletic in relation to Plesiosauroidea. Rhomaleosauridae was found to be outside Neoplesiosauria, but still within Plesiosauria. The early carnian pistosaur Bobosaurus was found to be more advanced than Augustasaurus in relation to the Plesiosauria and therefore it represents by definition the oldest known plesiosaur. However, the authors excluded Bobosaurus from this clade without any explanation, although that exclusion might be a typo in the article. This analysis focused on basal plesiosaurs and therefore only one derived pliosaurid and one cryptoclidian were included, while elasmosaurids weren't included at all. The cladogram below follows the topology from Benson et al. (2012) analysis.[38]

 Pistosauria 

"Pistosaurus postcranium"



Pistosaurus



Yunguisaurus liae




Augustasaurus hagdorni


 Plesiosauria 

Bobosaurus forojuliensis




NHMUK 49202 [now Anningasaura lymense]



 Rhomaleosauridae 

Stratesaurus taylori




Macroplata tenuiceps




Avalonnectes arturi




Eurycleidus arcuatus




Meyerasaurus victor




Maresaurus coccai




"Rhomaleosaurus" megacephalus




Archaeonectrus rostratus




Rhomaleosaurus cramptoni




Rhomaleosaurus thorntoni



Rhomaleosaurus zetlandicus












Neoplesiosauria 
 Pliosauridae 

Thalassiodracon hawkinsii




Hauffiosaurus spp.




Attenborosaurus conybeari



advanced pliosaurids (Peloneustes)





 Plesiosauroidea 

Eoplesiosaurus antiquior




Plesiosaurus dolichodeirus





Plesiopterys wildi



Cryptoclidus eurymerus



 Microcleididae 

Eretmosaurus rugosus



Westphaliasaurus simonsensii




Seeleyosaurus guilelmiimperatoris




Microcleidus tournemiensis




Microcleidus brachypterygius



Microcleidus homalospondylus















Paleobiology


Food

The probable food source of plesiosaurs varied depending on whether they belonged to the long-necked "plesiosauromorph" forms or the short-necked "pliosauromorph" species.

The extremely long necks of "plesiosauromorphs" have caused speculation as to their function from the very moment their special build became apparent. Already Conybeare offered three possible explanations. The neck could have served to intercept fast-moving fish in a pursuit. Alternatively, plesiosaurs rested on the sea bottom while the head was sent out to search for prey. This seemed to be confirmed by the fact the eyes were directed relatively upwards. Finally, Conybeare suggested the possibility that plesiosaurs swam on the surface, letting their necks plunge downwards to seek food at lower levels. All these interpretations took for granted that the neck was very flexible. The modern insight that the neck was in fact rather rigid, with limited vertical movement, has necessitated new explanations. One hypothesis is that the length of the neck made it possible to surprise schools of fish, the head arriving before the sight or pressure wave of the trunk could alert them. "Plesiosauromorphs" hunted visually, as shown by their large eyes, and perhaps employed a directional sense of olfaction. Hard and soft-bodied cephalopods probably formed part of their diet. Their jaws were probably strong enough to bite through the hard shells of this prey type. Fossil specimens have been found with cephalopod shells still in their stomach.[42] The bony fish (Osteichthyes), which further diversified during the Jurassic, were likely prey as well. A very different hypothesis claims that "plesiosauromorphs" were bottom feeders. The stiff necks would have been used to plough the sea bottom, eating the benthos. This would have been proven by long furrows present in ancients seabeds.[43][44] "Plesiosauromorphs" were not well adapted to catching large fast-moving prey, as their long necks, though seemingly streamlined, caused enormous skin friction. Sankar Chatterjee in 1989 suggested that some Cryptocleididae were suspension feeders, filtering plankton. Aristonectes e.g. had hundreds of teeth, allowing it to sieve small Crustacea from the water.[45]

The short-necked "pliosauromorphs" were top carnivores, or apex predators, in their respective foodwebs.[46] They were pursuit predators[47] or ambush predators of various sized prey and opportunistic feeders; their teeth could be used to pierce soft-bodied prey, especially fish.[48] Their heads and teeth were very large, suited to grab and rip apart large animals. Their morphology allowed for a high swimming speed. They too hunted visually.

Plesiosaurs were themselves prey for other carnivores as shown by bite marks left by a shark that have been discovered on a fossilized plesiosaur fin[49] and the fossilized remains of a mosasaur’s stomach contents that are thought to be the remains of a plesiosaur.[50]

Skeletons have also been discovered with gastroliths, stones, in their stomachs, though whether to help break down food, especially cephalopods, in a muscular gizzard, or to vary buoyancy, or both, has not been established.[51][52] However, the total weight of the gastroliths found in various specimens appear to be insufficient to modify the buoyancy of these large reptiles.[53]

Locomotion

Flipper movement

The distinctive four-flippered design has caused considerable speculation about what kind of stroke plesiosaurs used. The only modern group with four flippers are sea turtles which only use the front pair for propulsion. Conybeare and Buckland already compared the flippers with bird wings also. However, such a comparison was not very informative as the mechanics of bird flight in this period were poorly understood. By the middle of the nineteenth century, it was typically assumed that plesiosaurs employed a rowing movement. The flippers would have been moved forward in a horizontal position, to minimise friction, and then axially rotated to a vertical position in order to be pulled to the rear, causing the largest possible reactive force. In fact such a method would be very inefficient: the recovery stroke in this case generates no thrust and the rear stroke generates an enormous turbulence. In the early twentieth century, the newly discovered principles of bird flight suggested to several researchers that plesiosaurs like turtles and penguins made a flying movement while swimming. This was e.g. proposed by Eberhard Fraas in 1905,[54] and in 1908 by Othenio Lothar Franz Anton Louis Abel.[55] When flying, the flipper movement is more vertical, its point describing an oval or "8". Ideally, the flipper is first moved obliquely to the front and downwards and then, after a slight retraction and rotation, crosses this path from below to be pulled to the front and upwards. During both strokes, down and up, according to Bernoulli's principle, forward and upward thrust is generated by the convexly curved upper profile of the flipper, the front edge slightly inclined relative to the water flow, while turbulence is minimal. However, despite the evident advantages of such a swimming method, in 1924 the first systematic study on the musculature of plesiosaurs, by David Meredith Seares Watson, concluded they nevertheless performed a rowing movement.[56]

During the middle of the twentieth century, Watson's "rowing model" remained the dominant hypothesis regarding the plesiosaur swimming stroke. In 1957, Lambert Beverly Halstead, at the time using the family name Tarlo, proposed a variant: the hindlimbs would have rowed in the horizontal plane but the forelimbs would have paddled, moved to below and to the rear.[57][58] In 1975, the traditional model was challenged by Jane Ann Robinson who revived the "flying" hypothesis. She argued that the main muscle groups were optimally placed for a vertical flipper movement, not for pulling the limbs horizontally, and that the form of the shoulder and hip joints would have precluded the vertical rotation needed for rowing.[59] In a subsequent article, Robinson proposed that the kinetic energy generated by the forces exerted on the trunk by the strokes, would have been stored and released as elastic energy in the ribcage, allowing for an especially efficient and dynamic propulsion system.[60]

In Robinson's model, both the downstroke and the upstroke would have been powerful. In 1982 she was criticised by Samuel Tarsitano, Eberhard Frey and Jürgen Riess, who claimed that, while the muscles at the underside of the shoulder and pelvic plates were clearly powerful enough to pull the limbs downwards, comparable muscle groups on the top of these plates to elevate the limbs were simply lacking, and, had they been present, could not have been forcefully employed, their bulging carrying the danger of hurting the internal organs. They proposed a more limited flying model in which a powerful downstroke was combined with a largely unpowered recovery, the flipper returning to its original position by the momentum of the forward moving and temporarily sinking body.[61][62] This modified flying model became a popular interpretation. Less attention was given to an alternative hypothesis by Stephen Godfrey, in 1984 proposing that both the forelimbs and hindlimbs performed a deep paddling motion to the rear combined with a powered recovery stroke to the front, resembling the movement made by the forelimbs of sea-lions.[63]

In 2010, Frank Sanders and Kenneth Carpenter published a study concluding that Robinsons's model had been correct. Frey & Riess would have been mistaken in their assertion that the shoulder and pelvic plates had no muscles attached to their upper sides. While these muscle groups were probably not very powerful, this could easily have been compensated by the large muscles on the back, especially the Musculus latissimus dorsi which would have been well developed in view of the high spines on the backbone. Furthermore, the flat build of the shoulder and hip joints strongly indicated that the main movement was vertical, not horizontal.[64]

Gait

Like all tetrapods with limbs, plesiosaurs must have had a certain gait, a coordinated movement pattern of the, in this case, flippers. Of the infinite number of possibilities, attention in practice has been largely directed to the question of whether the front pair and hind pair moved simultaneously, so that all four flippers were engaged at the same moment, or in an alternate pattern, each pair being employed in turn. Frey & Riess in 1991 proposed an alternate model, which would have had the advantage of a more continuous propulsion.[65] In 2000, Theagarten Lingham-Soliar evaded the question by concluding that, like sea turtles, plesiosaurs only used the front pair for a powered stroke. The hind pair would have been merely used for steering. Lingham-Soliar deduced this from the form of the hip joint, which would have allowed for only a limited vertical movement. Furthermore a separation of the propulsion and steering function would have facilitated the general coordination of the body and prevented a too extreme pitch. He rejected Robinson's hypothesis that elastic energy was stored in the ribcage, considering the ribs too stiff for this.[66]

The interpretation by Frey & Riess became the dominant one but was in 2004 challenged by Sanders, who showed experimentally that, whereas an alternate movement might have caused excessive pitching, a simultaneous movement would have caused only a slight pitch, which could have been easily controlled by the hind flippers. Of the other axial movements, rolling could have been controlled by alternately engaging the flippers of the right or left side, and yaw by the long neck or a vertical tail fin. Sanders did not believe that the hind pair was not used for propulsion, concluding that the limitations imposed by the hip joint were very relative.[67] In 2010, Sanders & Carpenter concluded that with an alternating gait, the turbulence caused by the front pair would have hindered an effective action of the hind pair. Besides, a long gliding phase after a simultaneous engagement would have been very energy efficient.[64] It is also possible that the gait was optional and was adapted to the circumstances. During a fast steady pursuit an alternate movement would have been useful, in an ambush a simultaneous stroke would have made a peak speed possible. When searching for prey over a longer distance a combination of a simultaneous movement with gliding would have cost the least energy.[68]

Speed

In general, it is hard to determine the maximum speed of extinct sea creatures. For plesiosaurs this is made more difficult by the lack of consensus about their flipper stroke and gait. There are no exact calculations of their Reynolds Number. Fossil impressions show that the skin was relatively smooth, not scaled, and this may have reduced form drag.[64] Small wrinkles are present in the skin that may have prevented separation of the laminar flow in the boundary layer and thereby reduced skin friction.

Sustained speed may be estimated by calculating the drag of a simplified model of the body, that can be approached by a prolate spheroid, and the sustainable level of energy output by the muscles. A first study of this problem was published by Judy Massare in 1988.[69] Even when assuming a low hydrodynamic efficiency of 0.65, Massare's model seemed to indicate that plesiosaurs, if warm-blooded, would have cruised at a speed of four metres per second, or about fourteen kilometres per hour, considerably exceeding the known speeds of extant dolphins and whales.[70] However, Ryosuke Motani in 2002 showed that the formulae Massare used, had been flawed. A recalculation, using corrected formulae, resulted in a speed of half a metre per second (1,8 km/h) for a cold-blooded plesiosaur and one and a half metre per second (5,4 km/h) for an endothermic plesiosaur. Even the highest estimate is about a third lower than the speed of extant Cetacea.[71]

Massare also tried to compare the speeds of plesiosaurs with those of the two other main sea reptile groups, the Ichthyosauria and the Mosasauridae. She concluded that plesiosaurs were about 20% slower than advanced ichthyosaurs, which employed a very effective tunniform movement, oscillating just the tail, but 5% faster than mosasaurids which were assumed to swim with an inefficient anguilliform, eel-like, movement of the body.[70]

The many plesiosaur species may have differed considerably in their swimming speeds, reflecting the various body shapes present in the group. While the short-necked "pliosauromorphs" (e.g. Liopleurodon) may have been fast swimmers, the long-necked "plesiosauromorphs" were built more for manoeuvrability than for speed, slowed by a strong skin friction, yet capable of a fast rolling movement. Some long-necked forms, such as the Elasmosauridae, also have relatively short stubby flippers with a low aspect ratio, further reducing speed but improving roll.[72]

Diving

Few data are available that show how deep exactly plesiosaurs dived. That they dived to some considerable depth is proven by traces of decompression sickness. The heads of the humeri and femora with many fossils show necrosis of the bone tissue, caused by a too rapid ascent after deep diving. However, this does not allow to deduce some exact depth as the damage could have been caused by a few very deep dives, or alternatively by a great number of relatively shallow descents. The vertebrae show no such damage: they were probably protected by a superior blood supply, made possible by the arteries entering the bone through the two foramina subcentralia, large openings in their undersides.[73]

Descending would have been helped by a negative Archimedes Force, i.e. being heavier than water. Of course, this would have had the disadvantage of hampering coming up up again. Young plesiosaurs show pachyostosis, an extreme density of the bone tissue, which might have increased relative weight. Adult individuals have more spongy bone. Gastroliths have been suggested as a method to increase weight or even as means to attain neutral buoyancy, swallowing or spitting them out again as needed.[74]

The relatively large eyes of the Cryptocleididae have been seen as an adaptation to deep diving.

Metabolism

Traditionally, of extinct reptile groups it was assumed that they were cold-blooded like modern reptiles. New research during the past decades has lead to the conclusion that some groups, such as theropod dinosaurs and pterosaurs, were very likely warm-blooded. Whether perhaps plesiosaurs too were warm-blooded, is difficult to determine. One of the indications of a high metabolism is the presence of fast-growing fibrolamellar bone. The pachyostosis with juvenile individuals makes it hard to establish whether plesiosaurs possessed such bone, though. However, it has been possible to check its occurrence with more basal members of the more inclusive group plesiosaurs belonged to, the Sauropterygia. A study in 2010 concluded fibrolamellar bone was originally present with sauropterygians.[75] A subsequent publication in 2013 found that the Nothosauridae lacked this bone type but that basal Pistosauria possessed it, a sign of a more elevated metabolism.[76] It is thus more parsimonious to assume that the more derived pistosaurians, the plesiosaurs, also had a faster metabolism.

Reproduction

As reptiles in general are oviparous, until the end of the twentieth century it had been seen as possible that smaller plesiosaurs may have crawled up on a beach to lay their eggs, like the modern turtles. Their possession of strong limbs and a flat underside seemed to have made this feasible. This method was e.g. defended by Halstead. However, as those limbs no longer had functional elbow or knee joints and the underside by its very flatness would have generated a large friction, already in the nineteenth century it was hypothesised that plesiosaurs had been viviparous. Besides, it was hard to conceive how the largest species, with the size of whales, could have survived a beaching. Fossils finds of embryo's of ichthyosaurs showed that at least one group of marine reptiles had bore live young. The first to claim that similar embryos had been found with plesiosaurs was Harry Govier Seeley who reported in 1887 to have acquired a nodule with four to eight tiny skeletons.[77] In 1896, he described this discovery in more detail.[78] If authentic, the embryos of plesiosaurs would have been very small like those of ichthyosaurs. However, in 1982 Richard Anthony Thulborn showed that Seeley had been deceived by a "doctored" fossil of a nest of some crayfish.[79]

A real plesiosaur specimen found in 1987 eventually proved that plesiosaurs gave birth to live young:[80] This fossil of a pregnant Polycotylus latippinus shows that these animals gave birth to a single large juvenile and probably invested parental care in their offspring, similar to modern whales. The young was with a length of 1.5 metres large in comparison to its mother of five metres length, indicating a k-strategy in reproduction.[81] Little is known about growth rates or a possible sexual dimorphism.

Social behaviour and intelligence

From the parental care indicated by the large size of the young it can be deduced that social behaviour in general was relatively complex.[80] It is not known whether plesiosaurs hunted in packs. Their relative brain size seems to be typical for reptiles. Of the senses, sight and smell were important, hearing less so; elasmosaurids have lost the stapes completely. It has been suggested that with some groups the skull housed electro-sensitive organs.[82]

Paleopathology

Some plesiosaur fossils show pathologies, the result of illness or old age. In 2012, a mandible was described with a jaw joint clearly afflicted by arthritis, a typical sign of senescence.[83]

Distribution

Plesiosaurs have been found on every continent, including Antarctica.[84]

Stratigraphic distribution

The following is a list of geologic formations that have produced plesiosaur fossils.

Name Age Location Notes

Agardhfjellet Formation

Tithonian Colymbosaurus svalbardensis, Djupedalia, Pliosaurus funkei, Spitrasaurus

Akrabou Formation

Turonian Manemergus, Thililua

Allen Formation

Ampthill Clay Formation

Oxfordian Liopleurodon pachydeirus

Bearpaw Formation

Campanian Albertonectes, Dolichorhynchops herschelensis, Terminonatator

Blue Lias Formation

Rhaetian-Hettangian Anningasaura, Avalonnectes, Eoplesiosaurus, Eurycleidus, "Plesiosaurus" cliduchus, Plesiosaurus dolichodeirus, "Plesiosaurus" macrocephalus, "Rhomaleosaurus" megacephalus, Stratesaurus, Thalassiodracon

Britton Formation

Coniacian Libonectes

Bückeberg Formation

Berriasian Brancasaurus, Gronausaurus

Bulldog Shale Formation

Aptian-Albian Opallionectes, Umoonasaurus

Calcaire à Bélemnites

Pliensbachian Cryonectes

Carlile Formation

Turonian Megacephalosaurus

Charmouth Mudstone Formation

Sinemurian Archaeonectrus, Attenborosaurus

Chichali Formation

Clearwater Formation

Albian Nichollssaura, Wapuskanectes

Conway Formation

Campanian-Maastrichtian Mauisaurus

Coral Rag Formation

Oxfordian "Pliosaurus" grossouvrei

Favret Formation

Anisian Augustasaurus

Fencepost Limestone

Turonian Trinacromerum

Franciscan Formation

Graneros Shale

Cenomanian Thalassomedon

Greenhorn Limestone

Turonian Brachauchenius, Pahasapasaurus

Guanling Formation

Hiccles Cove Formation

Callovian Borealonectes

Horseshoe Canyon Formation

Maastrichtian Leurospondylus

Jagua Formation

Oxfordian Gallardosaurus, Vinialesaurus

Jaguel Formation

Maastrichtian Tuarangisaurus cabazai

Katiki Formation

Maastrichtian Kaiwhekea

Kimmeridge Clay

Kimmeridgian Bathyspondylus, Colymbosaurus, Kimmerosaurus, "Plesiosaurus" manselli, Pliosaurus brachydeirus, Pliosaurus brachyspondylus, Pliosaurus carpenteri, Pliosaurus kevani, Pliosaurus macromerus, Pliosaurus portentificus, Pliosaurus westburyensis

Kingsthorp

Toarcian Rhomaleosaurus thorntoni

Kiowa Shale

Albian Apatomerus

La Colonia Formation

Campanian Sulcusuchus

Lake Waco Formation

Los Molles Formation

Bajocian Maresaurus

Maree Formation

Leicestershire

late Sinemurian Eretmosaurus

Lücking clay pit

early Pliensbachian Westphaliasaurus

Marnes feuilletés

Toarcian Occitanosaurus

Mooreville Chalk Formation

Moreno Formation

Albian Fresnosaurus, Hydrotherosaurus, Morenosaurus

Muschelkalk

Anisian Pistosaurus

Naknek Formation

Kimmeridgian Megalneusaurus

Niobrara Formation

Santonian Brimosaurus,[85] Dolichorhynchops osborni,[86] Elasmosaurus,[86] Polycotylus,[86] Styxosaurus snowii[86][87]

Oxford Clay

Callovian Cryptoclidus, Liopleurodon, Marmornectes, Muraenosaurus, Pachycostasaurus, Peloneustes, "Pliosaurus" andrewsi, Picrocleidus, Simolestes, Tricleidus

Oulad Abdoun Basin

late Maastrichtian Zarafasaura

Paja Formation

Aptian Callawayasaurus, Kronosaurus boyacensis

Paso del Sapo Formation

Maastrichtian Aristonectes

Pierre Shale

Campanian Dolichorhynchops bonneri, Hydralmosaurus

Posidonia Shale

Toarcian Hauffiosaurus zanoni, Hydrorion, Meyerasaurus, Plesiopterys, Seeleyosaurus

Rio del Lago Formation

early Carnian Bobosaurus

São Gião Formation

Toarcian Lusonectes

Smoky Hill Chalk

Campanian Dolichorhynchops osborni

Sundance Formation

Oxfordian Megalneusaurus, Pantosaurus, Tatenectes

Sundays River Formation

Valanginian Leptocleidus capensis

Tahora Formation

Campanian Tuarangisaurus keyesi

Tamayama Formation

Santonian Futabasaurus

Thermopolis Shale

Albian Edgarosaurus

Toolebuc Formation

Albian Eromangasaurus

Tropic Shale Formation

Turonian Brachauchenius sp. (unnamed, previously referred to B. lucasi), Dolichorhynchops tropicensis, Eopolycotylus, Palmulasaurus, Trinacromerum sp.

Vectis Formation

Aptian Vectocleidus

Wadhurst Clay Formation

Valanginian Hastanectes

Wallumbilla Formation

Aptian-Albian Styxosaurus glendowerensis

Weald Clay

Barremian Leptocleidus superstes

Whitby Mudstone Formation

Toarcian Hauffiosaurus longirostris, Hauffiosaurus tomistomimus, Macroplata, Microcleidus homalospondylus, Microcleidus macropterus, Rhomaleosaurus cramptoni, Rhomaleosaurus propinquus, Rhomaleosaurus zetlandicus, Sthenarosaurus

Wilczek Formation

Norian Alexeyisaurus

Xintiangou Formation

Middle Jurassic Yuzhoupliosaurus

Zhenzhuchong Formation

Ziliujing Formation

Toarcian Bishanopliosaurus, Sinopliosaurus

Plesiosaurs in contemporary culture

Main article: Loch Ness Monster

It has been suggested that legends of sea serpents and modern sightings of supposed monsters in lakes or the sea could be explained by the survival of plesiosaurs into modern times. This cryptozoological proposal has been rejected by the scientific community at large, which considers it to be based on fantasy and pseudoscience. Purported plesiosaur carcasses have shown to be partially decomposed corpses of basking sharks instead.[88][89][90]

While the Loch Ness monster is often reported as looking like a plesiosaur, it is also often described as a creature that looks nothing like a plesiosaur. A number of reasons have been presented why a plesiosaurian identity is unlikely. These include the assumption that the water in the lake is too cold for a presumed cold-blooded reptile to be able to survive easily, the assumption that air-breathing animals would be easy to see whenever they appear at the surface to breathe,[91] the fact that the lake is too small and contains insufficient food to be able to support a breeding colony of large animals, and finally the fact that the lake was only formed ten thousand years ago at the end of the last ice age, while the latest fossil appearance of plesiosaurs dates to over 65 million years ago.[92] Frequent explanations for the sightings include waves, floating inanimate objects, tricks of the light, swimming known animals, and practical jokes.[93] Nevertheless, in the popular imagination plesiosaurs have come to be identified with the Monster of Loch Ness. This has had the advantage of making the group better known to the general public but the disadvantage that people have trouble taking the subject seriously, forcing paleontologists to explain time and again that plesiosaurs really did exist and are not mythical or fantasy creatures.[94]

References

Bibliography

  • Carpenter, K. 1996. A review of short-necked plesiosaurs from the Cretaceous of the western interior, North America. Neues Jahrbuch fuer Geologie und Palaeontologie Abhandlungen (Stuttgart) 201(2):259-287.
  • Carpenter, K. 1997. Comparative cranial anatomy of two North American Cretaceous plesiosaurs. Pp 91–216, in Calloway J. M. and E. L. Nicholls, (eds.), Ancient Marine Reptiles, Academic Press, San Diego.
  • Carpenter, K. 1999. Revision of North American elasmosaurs from the Cretaceous of the western interior. Paludicola 2(2):148-173.
  • Cope, E. D. 1868. Remarks on a new enaliosaurian, Elasmosaurus platyurus. Proceedings of the Academy of Natural Sciences of Philadelphia 20:92-93.
  • Ellis, R. 2003: Sea Dragons (Kansas University Press)
  • Everhart, M. J. 2002. Where the elasmosaurs roamed Prehistoric Times 53: 24-27.
  • Everhart, M.J. 2005. "Where the Elasmosaurs roamed," Chapter 7 in Oceans of Kansas: A Natural History of the Western Interior Sea, Indiana University Press, Bloomington, 322 p.
  • Hampe, O., 1992: Courier Forsch.-Inst. Senckenberg 145: 1-32
  • ( ), 1997: in Reports of the National Center for Science Education, 17.3 (May/June 1997) pp 16–28.
  • Everhart, M.J. 2005. Oceans of Kansas: A Natural History of the Western Interior Sea. Indiana University Press, Bloomington, 322 pp.
  • Everhart, M.J. 2005. "Gastroliths associated with plesiosaur remains in the Sharon Springs Member (Late Cretaceous) of the Pierre Shale, Western Kansas" ( 103(1-2):58-69)
  • Everhart, Michael J. 2006. The Occurrence of Elasmosaurids (Reptilia: Plesiosauria) in the Niobrara Chalk of Western Kansas; Paludicila; 5(4) pp. 170–183
  • Storrs, G. W., 1999. An examination of Plesiosauria (Diapsida: Sauropterygia) from the Niobrara Chalk (Upper Cretaceous) of central North America, University of Kansas Paleontologcial Contributions, (N.S.), No. 11, 15 pp.
  • Welles, S. P. 1943. Elasmosaurid plesiosaurs with a description of the new material from California and Colorado. University of California Memoirs 13:125-254. figs.1-37., pls.12-29.
  • Welles, S. P. 1952. A review of the North American Cretaceous elasmosaurs. University of California Publications in Geological Science 29:46-144, figs. 1-25.
  • Welles, S. P. 1962. A new species of elasmosaur from the Aptian of Columbia and a review of the Cretaceous plesiosaurs. University of California Publications in Geological Science 46, 96 pp.
  • White, T., 1935: in Occasional Papers Boston Soc. Nat. Hist. 8: 219-228
  • Williston, S. W. 1890. A new plesiosaur from the Niobrara Cretaceous of Kansas. Kansas Academy of Science, Transactions 12:174-178, 2 fig.
  • Williston, S. W. 1902. Restoration of Dolichorhynchops osborni, a new Cretaceous plesiosaur. Kansas University Science Bulletin, 1(9):241-244, 1 plate.
  • Williston, S. W. 1903. North American plesiosaurs. Field Columbian Museum, Publication 73, Geology Series 2(1): 1-79, 29 pl.
  • Williston, S. W. 1906. North American plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus. American Journal of Science, Series 4, 21(123): 221-234, 4 pl.
  • Williston, S. W. 1908. North American plesiosaurs: Trinacromerum. Journal of Geology 16: 715-735.

External links

  • The Plesiosaur Site. Richard Forrest.
  • The Plesiosaur Directory. Adam Stuart Smith.
    • Plesiosauria technical definition at the Plesiosaur Directory
  • Plesiosaur FAQ's. Raymond Thaddeus C. Ancog.
  • Oceans of Kansas Paleontology. Mike Everhart.
  • "Plesiosaur fossil found in Bridgwater Bay". Somersert Museums County Service. (best known fossil)
  • "Fossil hunters turn up 50-ton monster of prehistoric deep". Allan Hall and Mark Henderson. Times Online, December 30, 2002. (Monster of Aramberri)
  • Triassic reptiles had live young.
  • Bridgwater Bay juvenile plesiosaur

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