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A new tritylodontid synapsid from Mongolia

100%

Watabe M., Tsubamoto T., Tsogtbaatar K.

Acta Palaeontologica Polonica

2007

tom 52

nr 2

The Upper Jurassic Ulaan Malgait Beds in the Shar Teg locality of southwestern Mongolia have yielded remains of a new tritylodontid therapsid (Synapsida), Bienotheroides shartegensis sp. nov. The specimen consists of a fragmentary skull associated with lower jaws. It is assigned to Bienotheroides based on its short snout, a premaxilla−palatine contact, very reduced maxilla, relatively rounded corner of upper postcanine teeth (PC), and PC cusp formula of 2−3−3. It differs from the other species of Bienotheroides in having a much more reduced middle mesial cusp of PC. It further differs from B. zigongensis and B. ultimus in having shorter and wider PC, from B. ultimus in lacking a projection at the middle mesial margin of PC, and from B. wansienensis in lacking the vestigialmost mesiobuccal cusp of PC and in lacking a diastema between upper I1 and I2. This is the first discovery of the Tritylodontidae in Mongolia. This discovery extends the taxonomic (morphological) diversity and geographic range of Bienotheroides and underlies the success of the genus in the Middle to Late Jurassic biota of eastern Eurasia.

A new tritylodontid from the Upper Jurassic of Xinjiang, China

80%

Hu Y., Meng J., Clark J. M.

Acta Palaeontologica Polonica

2009

tom 54

nr 3

385-391

A new genus and species of Tritylodontidae, Yuanotherium minor, is described and compared with other known tritylodontids. The new taxon is represented by a partially preserved upper jaw with three postcanines, collected from the upper part of the Shishugou Formation (Oxfordian, Late Jurassic) in the Wucaiwan area of the Junggar Basin, northwestern Xinjiang, China. Like other tritylodontids its maxillary teeth have three rows of blade−like trenchant cusps separated by deep furrows. The new species differs from other tritylodontids mainly in having posteriormost two cusps of the median row on upper postcanines closely placed. The new tritylodontid may have been omnivorous rather than herbivorous, as previously suggested for tritylodontids in general.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Clark J. M.

1 Hu Y.

1 Meng J.

1 Tsogtbaatar K.

1 Tsubamoto T.

1 Watabe M.

1 2009

1 2007

Wyniki wyszukiwania

A new tritylodontid synapsid from Mongolia

A new tritylodontid from the Upper Jurassic of Xinjiang, China