ON THE CRANIAL ANATOMY OF THE POLYCOTYLID PLESIOSAURS, INCLUDING NEW MATERIAL OF POLYCOTYLUS LATIPINNIS, COPE, FROM ALABAMA
@inproceedings{OKeefe2004ONTC, title={ON THE CRANIAL ANATOMY OF THE POLYCOTYLID PLESIOSAURS, INCLUDING NEW MATERIAL OF POLYCOTYLUS LATIPINNIS, COPE, FROM ALABAMA}, author={F. Robin O'Keefe}, year={2004} }
Abstract The cranial anatomy of plesiosaurs in the family Polycotylidae (Reptilia: Sauropterygia) has received renewed attention recently because various skull characters are thought to indicate plesiosauroid, rather than pliosauroid, affinities for this family. New data on the cranial anatomy of polycotylid plesiosaurs is presented, and is shown to compare closely to the structure of cryptocleidoid plesiosaurs. The morphology of known polycotylid taxa is reported and discussed, and a…
58 Citations
OF THE SHOULDER IN POLYCOTYLUS LATIPINNUS ( PLESIOSAURIA : POLYCOTYLIDAE ) AND ITS BEARING ON PLESIOSAUR VIVIPARITY
- Biology
- 2012
Comparison of the fetal material with a juvenile polycotylid specimen and with adult material of Dolichorhynchops osborni demonstrates that the elements identified as fetal humeri are in fact scapulae, and that the fetal clavicles were misidentified as the scapula.
Braincase of a Polycotylid Plesiosaur (Reptilia: Sauropterygia) from the Upper Cretaceous of Manitoba, Canada
- Medicine
- 2011
A virtual reconstruction of the braincase of a polycotylid plesiosaur referable to Dolichorhynchops from the Niobrara Formation was created by using a three-dimensional scanning technique that produces accurate reconstruction of missing or damaged elements and demonstrates the three- dimensional relationships among the elements.
Revision of polycotylid plesioaur systematics (sauropterygia plesiosauria) and description of the axial osteology of a juvenile polycotylid
- Biology
- 2016
A phylogenetic analysis incorporating a large taxon sampling from the Polycotylidae was used to parse out the evolutionary relationships among the taxa, and revealed that the two Wallace Ranch specimens form a well-supported clade, and feature a mosaic of character states found in currently described species, and may represent a new species.
The cranial osteology of two specimens of Dolichorhynchops bonneri (Plesiosauria, Polycotylidae) from the Campanian of South Dakota, and a cladistic analysis of the Polycotylidae
- BiologyCretaceous Research
- 2019
On the skull of a pliosaur (Plesiosauria; Pliosauridae) from the Upper Cretaceous (Early Turonian) of the North American Western Interior
- Geography, Environmental Science
- 2008
Abstract A partial pliosaur skull reveals anatomical features poorly known for Plesiosauria. The specimen lacks recorded contextual information, however preservational character and nannofossil…
Revision of Sulcusuchus erraini (Sauropterygia, Polycotylidae) from the Upper Cretaceous of Patagonia, Argentina
- Biology
- 2013
Sulcusuchus erraini, from the upper Campanian–lower Maastrichtian of Patagonia, Argentina, is the only polycotylid from the Southern Hemisphere for which the skull and mandible are known and several hypotheses about the identity of the structures that could have been housed in the rostral and mandibular grooves are evaluated.
A new plesiosaur from the Lower Jurassic of Portugal and the early radiation of Plesiosauroidea
- BiologyActa Palaeontologica Polonica
- 2021
This plesiosaur partial skeleton, comprising most of the trunk and including axial, limb, and girdle bones, was collected in the lower Sinemurian of Praia da Concha and testifies to the incursion of marine reptiles in the newly formed proto-Atlantic sea, prior to the Atlantic Ocean floor spreading in the Early Cretaceous.
The Anatomy and Taxonomy of Macroplata tenuiceps (Sauropterygia, Plesiosauria) from the Hettangian (Lower Jurassic) of Warwickshire, United Kingdom
- Geography
- 2010
ABSTRACT
A detailed re-description and revised diagnosis is given for Macroplata tenuiceps Swinton, 1930, a plesiosaurian known from a single almost complete specimen (BMNH R5488) from the Blue…
The evolutionary history of polycotylid plesiosaurians
- Environmental ScienceRoyal Society Open Science
- 2018
Phylogenetic analyses of a new cladistic dataset based on first-hand observation of most polycotylids recover Thililua and Mauriciosaurus as successive lineages at the base of the earliest Late Cretaceous polycotyline radiation.
The cranial anatomy and taxonomy of Peloneustes philarchus (Sauropterygia, Pliosauridae) from the Peterborough Member (Callovian, Middle Jurassic) of the United Kingdom
- Geography
- 2011
Well-preserved material clearly indicates that P. philarchus lacked nasals, but possessed a lacrimal, and a previously unrecognised ‘palpebral’ forms part of the dorsal orbit margin adjacent to the prefrontal.
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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.