Acta Palaeontologica Polonica

First evidence of a neonate dentition in pareiasaurs from the Upper Permian of Russia

Elena G. Kordikova and Albert J. Khlyupin

Acta Palaeontologica Polonica 46 (4), 2001: 589-594

Finds of juvenile parareptiles are rare in the fossil record. We describe partial upper dentition with large vacuities between bones belonging to a neonate pareiasaur (preserved skull fragment is 22.4 mrn long). The specimen was collected within 5 m from a skeleton of an adult specimen of Deltavjatia vjatkensis (Hartmann-Weinberg, 1937) (Pareiasauridae) from red calcareous mudstones in the upper part of the Vanyushonkov Member of Ursulov Formation (Upper Permian, Upper Tatarian substage, Vishkil'skiy regional stage) of Kotel'nich locality, Vyatka River region, Russia. Referral to Deltavjatia vjatkensis is based on the presence of heterodont dentition: spatulate maxillary, triconodont vomerine and conical, palatine and pterygoid teeth located on well-developed palate ridges. This is the
first positively identified record of the neonate pareiasaur dentition.

Elena G. Kordikova [ or elena.kordikova@uni-tuebingen.de1 , present address: Universitat Tiibingen, Institut u. Museum fur Geologie u. Palaontologie, Sigwartstrasse 10, 72076 Tiibingen, Germany; Albert J. Khlyupin [ ], Kotel'nich Museum, K. MarxStr., 5, Kotelnich 612100, Kirov area, Russia.

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