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Naturwissenschaften. 2014 Mar;101(3):251-9. doi: 10.1007/s00114-014-1148-4. Epub 2014 Jan 23.

A new marine reptile from the Triassic of China, with a highly specialized feeding adaptation.

Author information

1
Wuhan Institute of Geology and Mineral Resources, 69 Gangyao Road, Wuhan, 430223, People's Republic of China, clong@cgs.cn.

Abstract

The Luoping fauna (Anisian, Middle Triassic) is probably the oldest of Triassic faunas in Guizhou-Yunnan area, China. The reptilian assemblage is comprised of ichthyosaurs, a number of sauropterygians (pachypleurosaur-like forms), saurosphargids, protorosaurs, and archosauriforms. Here, we report on a peculiar reptile, newly found in this fauna. Its dentition is fence or comb-like and bears more than 175 pleurodont teeth in each ramus of the upper and lower jaws, tooth crown is needle-like distally and blade-shaped proximally; its rostrum strongly bends downward and the anterior end of its mandible expands both dorsally and ventrally to form a shovel-headed structure; and its ungual phalanges are hoof-shaped. The specializations of the jaws and dentition indicate that the reptile may have been adapted to a way of bottom-filter feeding in water. It is obvious that such delicate teeth are not strong enough to catch prey, but were probably used as a barrier to filter microorganisms or benthic invertebrates such as sea worms. These were collected by the specialized jaws, which may have functioned as a shovel or pushdozer (the mandible) and a grasper or scratcher (the rostrum). Our preliminary analysis suggests that the new reptile might be more closely related to the Sauropterygia than to other marine reptiles.

PMID:
24452285
DOI:
10.1007/s00114-014-1148-4
[Indexed for MEDLINE]
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