AN EARLY POLYCOTYLID PLESIOSAUR (REPTILIA: SAUROPTERYGIA) FROM THE CRETACEOUS OF HOKKAIDO, JAPAN

@inproceedings{Sato2000ANEP,
  title={AN EARLY POLYCOTYLID PLESIOSAUR (REPTILIA: SAUROPTERYGIA) FROM THE CRETACEOUS OF HOKKAIDO, JAPAN},
  author={Tamaki Sato and Glenn W. Storrs},
  year={2000}
}
Abstract A partial skeleton of a short-necked plesiosaur excavated from the Upper Cenomanian of the Middle Yezo Group of Hokkaido, Japan, includes disarticulated vertebrae, the right half of the pectoral girdle, fragments of the pelvic girdle, ribs, gastralia, and gastroliths. Gastroliths are unusual in short-necked plesiosaurs. Skeletal characters indicate that the specimen belongs to the Family Polycotylidae, well known from North America, the former Soviet Republics, and possibly from New… 

A Turonian Polycotylid Plesiosaur (Reptilia: Sauropterygia) from Obira Town, Hokkaido, and Its Biostratigraphic and Paleoecological Significance

Abstract. The Polycotylidae are short-necked plesiosaurs known from the Cretaceous in various parts of the world, but only a few occurrences have been documented in Japan, where elasmosaurid remains

Unusual occurrence of gastroliths in a polycotylid plesiosaur from the Upper Cretaceous Tropic Shale, southern Utah

Abstract A polycotylid plesiosaur (Dolichorhynchops sp.), recently discovered in the Upper Cretaceous (Cenomanian-Turonian) Tropic Shale in Glen Canyon National Recreation Area, southern Utah, is

OSTEOLOGY OF A NEW PLESIOSAUR FROM THE LOWER CRETACEOUS (ALBIAN) THERMOPOLIS SHALE OF MONTANA

Abstract A new taxon of Cretaceous short-necked plesiosaur, Edgarosaurus muddi, gen. et sp. nov., is described. The specimen consists of a complete skull, 34 vertebrae including the entire series of

ON THE CRANIAL ANATOMY OF THE POLYCOTYLID PLESIOSAURS, INCLUDING NEW MATERIAL OF POLYCOTYLUS LATIPINNIS, COPE, FROM ALABAMA

New data on the cranial anatomy of polycotylid plesioaurs is presented, and is shown to compare closely to the structure of cryptocleidoid plesiosaurs, and a preliminary phylogenetic analysis is used to establish ingroup relationships of the Cryptocleidoidea.

A new elasmosaurid (Sauropterygia: Plesiosauria) from the non-marine to paralic Dinosaur Park Formation of southern Alberta, Canada

This study reports on a recently collected and prepared specimen, which represents the most complete elasmosaurid yet collected from the DPF, and is sufficiently complete to be assigned as the holotype of a new genus and species.

Revision of Sulcusuchus erraini (Sauropterygia, Polycotylidae) from the Upper Cretaceous of Patagonia, Argentina

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.

Revision of polycotylid plesioaur systematics (sauropterygia plesiosauria) and description of the axial osteology of a juvenile polycotylid

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.

A NEW POLYCOTYLID PLESIOSAUR (REPTILIA: SAUROPTERYGIA) FROM THE UPPER CRETACEOUS BEARPAW FORMATION IN SASKATCHEWAN, CANADA

  • Tamaki Sato
  • Environmental Science, Geography
    Journal of Paleontology
  • 2005
Abstract A new species of polycotylid, Dolichorhynchops herschelensis, is described based on a well-preserved skeleton from the Upper Cretaceous (Campanian–Maastrichtian) Bearpaw Formation of

The evolutionary history of polycotylid plesiosaurians

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.

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