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The actinistian (Sarcopterygii) Piveteauia madagascariensis Lehman from the Lower Triassic of northwestern Madagascar: a redescription on the basis of new material

1999; Taylor & Francis; Volume: 19; Issue: 2 Linguagem: Inglês

10.1080/02724634.1999.10011137

1937-2809

Gaël Clément,

Ichthyology and Marine Biology

ABSTRACT A second specimen of Piveteauia madagascariensis (Sarcopterygii, Actinistia) from the Lower Triassic of Madagascar, very well-preserved compared to the holotype, adds to our knowledge of the genus. It is characterized by an anterior position of the pelvic fins, a lachrymojugal very elongated and slightly curved, and a palatal surface of the entopterygoid covered with numerous parallel rows and tiny rounded denticles. The new specimen shows also some peculiar elements such as remains of the calcified bladder consisting of superimposed plates with parallel striations and enigmatic spherical bodies extending from the area of the pectoral fin to that of the pelvic fin.