Acta Palaeontologica Polonica

Mammal-like tooth from the Upper Triassic of Poland

Marlena Świło, Grzegorz Niedźwiedzki, and Tomasz Sulej

Acta Palaeontologica Polonica 59 (4), 2014: 815-820 doi:

Recent Triassic discoveries have extended the record of near-mammals (Mammaliaformes) back to the Norian, about 215 Ma, and reveal a significant diversity of Late Triassic (Norian-Rhaetian) forms. We now add to this Late Triassic diversity a nearly complete double-rooted right lower molariform tooth (ZPAL V.33/734) from the Polish Upper Triassic that is significant because it comes from uppermost Norian–lower Rhaetian rocks and is the first discovery of a mammal-like tooth in the Mesozoic of Poland. The described tooth shows transitional dental morphology between advanced cynodonts and mammaliaforms and it appears to represent a basal mammaliaform (genus Hallautherium), probably belonging to Morganucodonta.

Marlena Świło [], Instytut Paleobiologii PAN, ul. Twarda 51/55, PL−00−818 Warszawa, Poland and Polish Geological Institute–National Research Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland; Grzegorz Niedźwiedzki [], Department of Organismal Biology, Uppsala University, Norbyvägen 18A, 752 36 Uppsala, Sweden; Tomasz Sulej [], Instytut Paleobiologii PAN, ul. Twarda 51/55, PL−00−818 Warszawa, Poland.

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