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[dinosaur] Polycotylus sopozkoi, new plesiosaur from Russia + new Mongolian lizards + turtles from Arkansas





Ben Creisler
bcreisler@gmail.com

Some new non-dino papers:


Two Russian refs. The official English translations are not yet available so the titles and abstracts are my rough translations with a little help from Google Translate.


V.M. Efimov, I.A. Meleshin & A.V. Nikiforov  (2016)
A new species of the plesiosaur genus Polycotylus from the Late Cretaceous of the Southern Ural.
Paleontological Journal  50(5): 62-72  (Russian edition)
DOI: 10.7868/S0031031X16050056
http://elibrary.ru/item.asp?id=26601035

A description of the most complete remains discovered of the plesiosaur genus Polycotylus from the Upper Cretaceous of the Southern Ural. This find is in many ways similar to the species  P. latipinnis described from North America, but there are significant differences in the structure of the limbs and bones of the skull that allow assignment to a separate species, Polycotylus sopozkoi sp. nov.

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This paper names new taxa, but I have don't have access and have not found the new taxa named in another source.

V. R. Alifanov (2016) 
The lizard family Hodzhakuliidae (Scincomorpha) from the Early Cretaceous of Mongolia.
Paleontological Journal  50(5):  73-82 (Russian edition)
DOI:  10.7868 / S0031031X16050032
http://elibrary.ru/item.asp?id=26601036



The Hodzhakuliidae (Scincomorpha) family of lizards, endemic to the Early Cretaceous Central Asia, are characterized in the light of the discovery of representatives in the Hobur location in Mongolia. Materials are  classified as Hodzhakulia magna Nessov, 1985, previously described from the Upper Albian of Uzbekistan, and three new genera and species. It is assumed that representatives of  the Hodzhakuliidae occupied the ecological niche of small carnivorous predators until the appearance of the taxon Platynota.


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Free pdf:

Martin A. Becker, Harry M. Maisch IV and John A. Chamberlain Jr. (2016)
Turtles From an Arkadelphia Formation—Midway Group Lag Deposit (Maastrichtian—Paleocene), Hot Spring County, Arkansas, USA.
Geosciences 2016, 6(3), 41; 
doi:10.3390/geosciences6030041
http://www.mdpi.com/2076-3263/6/3/41

The Arkadelphia Formation—Midway Group (Maastrichtian—Paleocene) contact near Malvern, Arkansas preserves a K-Pg boundary assemblage of turtle species consisting of skull, shell, and non-shell postcranial skeletal elements. The Malvern turtles are preserved within a coquina lag deposit that comprises the basalmost Midway Group and also contains an abundance of other reptiles, as well as chondrichthyans, osteichthyans, and invertebrates. This coquina lag deposit records a complex taphonomic history of exhumation and reburial of vertebrate skeletal elements along a dynamic ancestral shoreline in southwestern Arkansas during the late Cretaceous-early Paleocene. Based on stratigraphic occurrence, the Malvern turtle assemblage indicates that these marine reptiles were living at or near the time of the K-Pg mass extinction and represent some of the latest Cretaceous turtles yet recovered from the Gulf Coastal Plain of the United States.

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