Osteology of the Cryptocleidoid Plesiosaur Tatenectes laramiensis, with Comments on the Taxonomic Status of the Cimoliasauridae

  title={Osteology of the Cryptocleidoid Plesiosaur Tatenectes laramiensis, with Comments on the Taxonomic Status of the Cimoliasauridae},
  author={F. Robin O'Keefe and Hallie Street},
ABSTRACT Recent field work in the Bighorn Basin, Wyoming has recovered significant new material of the plesiosaur Tatenectes laramiensis. The majority of cryptocleidoid plesiosaurs have been recovered from Middle and Upper Jurassic units (Oxford and Kimmeridge Clays, respectively) in the United Kingdom, but Tatenectes laramiensis is one of at least two cryptocleidoids known from the Upper Sundance Member of the Sundance Formation (Oxfordian) of North America. Although poorly known, they bear… 

A New Skeleton of the Cryptoclidid Plesiosaur Tatenectes laramiensis Reveals a Novel Body Shape Among Plesiosaurs

It is hypothesized that Tatenectes had a dorsoventrally compressed, oblate spheroid body shape, with a high skeletal mass concentration in the ventral elements, perhaps allowing access to above normal wave base, inshore environments in the shallow Sundance Seaway.

A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography

A phylogenetic analysis incorporating new characters reveals a novel tree topology for Cryptoclididae and particularly within the subfamily Colymbosaurinae, showing that at least two cryptoclidid lineages were present in the Boreal Region during the latest Jurassic at middle to high latitudes.

A New Partial Skeleton of a Cryptocleidoid Plesiosaur from the Upper Jurassic Sundance Formation of Wyoming

These specimens represent the first significant adult material provisionally referable to Pantosaurus striatus, as well as the first posterior axial column and pelvic girdle from the Bighorn Basin of Wyoming.

Evidence of Pachyostosis in the Cryptocleidoid Plesiosaur Tatenectes laramiensis from the Sundance Formation of Wyoming

In this paper we present evidence for pachyostosis in the cryptocleidoid plesiosaur Tatenectes laramiensis Knight, 1900 (O’Keefe and Wahl, 2003a). Pachyostosis is not common in plesiosaurs and is

Anatomy of Colymbosaurus megadeirus (Reptilia, Plesiosauria) from the Kimmeridge Clay Formation of the U.K., and High Diversity Among Late Jurassic Plesiosauroids

Substantial differences between the atlas-axis complexes and cervical vertebrae of Kimmerosaurus langhami, ‘Plesiosaurus’ manselii, C. megadeirus, and specimens referred here to cf.

Cryptoclidid Plesiosaurs (Sauropterygia, Plesiosauria) from the Upper Jurassic of the Atacama Desert

ABSTRACT This study presents the first plesiosaurs recovered from the Jurassic of the Atacama Desert that are informative at the genus level. One specimen is represented by an articulated axial

Osteology and Relationships of Colymbosaurus Seeley, 1874, Based on New Material of C. svalbardensis from the Slottsmøya Member, Agardhfjellet Formation of Central Spitsbergen

A phylogenetic analysis recovers a monophyletic and well-supported Colymbosaurus, and confirms that this species is not synonymous with other described Slottsmøya Member plesiosauroids, demonstrating considerable diversity of the clade at high latitudes close to the Jurassic-Cretaceous boundary.

Two new species of long-necked plesiosaurians (Reptilia: Sauropterygia) from the Upper Jurassic (Middle Volgian) Agardhfjellet Formation of central Spitsbergen

The Middle Volgian age of this material helps to bridge the temporal and morphological gap between better known Middle and Late Jurassic plesiosaurians from Europe and Late Cretaceous taxa primarily known from North America.



Current Taxonomic Status of the Plesiosaur Pantasaurus Striatus from the Upper Jurassic Sundance Formation, Wyoming

The taxon MuraenQSOUrus reedii Mebl 1912 is shown to be a junior synonym of Pantowurus striatus and it is believed that Panlosaurus striatus is a valid taxon.

A Cladistic Analysis and Taxonomic Revision of the Plesiosauria (Reptilia: Sauropterygia)

The Plesiosauria is found to by polyphyletic due to the inclusion of the Polycotylidae; this second clade is instead a member of the Plesiosauroidea, and thus more closely related to elasmosaurs than to other ‘pliosaurs’.

A New Marine Reptile (Sauropterygia) from New Zealand: Further Evidence for A Late Cretaceous Austral Radiation of Cryptoclidid Plesiosaurs

Kaiwhekea katiki gen. et sp. nov. represents the first described cryptoclidid plesiosaurian from New Zealand. It is one of the largest cryptoclidids known, at a length of over 6.5 m, and represents

Preliminary Report on the Osteology and Relationships of a New Aberrant Cryptocleidoid Plesiosaur from the Sundance Formation, Wyoming

The cryptocleidoid plesiosaur Taktwcflts laram.eruiS, new genus, is described from the Redwater Shale: Member of the Sundance fonnation. Narrona County, Wyommg.. The bolotypc of this species was a


The dental morphology and peculiar occlusal pattern, forming an interlocking trap, suggest that Aristonectes strained a diet of small, soft organisms from the water.

New plesiosaurs from the Upper Cretaceous of Antarctica

  • S. ChatterjeeB. Small
  • Geography, Environmental Science
    Geological Society, London, Special Publications
  • 1989
Abstract New plesiosaur remains from the Upper Cretaceous Lopez de Bertodano Formation (late Campanian-Maastrichtian) of Seymour Island, Antarctic Peninsula include Cryptoclididae and Elasmosauridae.

A pliosaur (Reptilia, Sauropterygia) exhibiting pachyostosis from the Middle Jurassic of England

A new and unusual pliosaurid from the Peterborough Member, Oxford Clay Formation (Callovian, Jurassic) of Cambridgeshire, UK, exhibits a type of pachyostosis and bone thickening of the rib cage and

Reassessment of the Early Cretaceous plesiosaur Cimoliasaurus maccoyi Etheridge, 1904 (Reptilia : Sauropterygia) from White Cliffs, New South Wales

A review of 'cimoliasaurian' taxa described from the Callovian to Maastrichtian of Europe, North and South America, New Zealand and Australia indicates that all can either be reassigned or represent nomina dubia.

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

The species, judging from the remains at hand, is one of the most primitive found in America and in all probability belongs to a new genus and is provisionally placed with the English genus Muraenosaurus Seeley,' which it closely resembles in several respects.

Notes on some Reptile finds from the Mesozoic of Scania

Abstract The material here described includes 1.) A Plesiosaurian pubis (fig. 1) from the Lower Campanian at Onnestad, N. E. Scania. The bone is with great probability referable to Scanisaurus cf.