Side-Necked Turtle Lower Jaws (Podocnemididae, Bothremydidae) from the Late Cretaceous Maevarano Formation of Madagascar

作者: EUGENE S. GAFFNEY , CATHERINE A. FORSTER

DOI: 10.1206/0003-0082(2003)397<0001:STLJPB>2.0.CO;2

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摘要: Two lower jaws from the upper part (early Maastrichtian) of late Cretaceous Maevarano Formation in Mahajanga Basin, northwestern Madagascar, are identified as belonging to side-necked turtles (Pleurodira). A nearly complete jaw is cf. Erymnochelys because its close resemblance living Malagasy madagascariensis. Both uniquely possess combination a posteriorly directed processus retroarticularis and identical triturating surface that narrow anteriorly with horizontal labial ridge dorsally rising lingual ridge. second specimen, consisting an incomplete symphyseal region, questionably Bothremydidae on basis thick wedge-shaped symphysis partial or pits rami. The specimen oldest record Erymnochelysor taxon very similar it, it indicates persistence Mesozoic element extant turtle fauna. possible bothremydid suggests more cosmopolitan now extinct.

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