GONDWANODUS IRWINENSIS GEN. ET. SP. NOV., A NEW ELASMOBRANCH FROM THE EARLY PERMIAN (LATE SAKMARIAN) FOSSIL CLIFF MEMBER OF THE HOLMWOOD SHALE, PERTH BASIN, WESTERN AUSTRALIAWA Museum Records and Supplements | Updated 8 years agoAbstract - A new elasmobranch is described from the Early Permian (Sakmarian, Sterlitamaklan) of Western Australia. Gondwanodus irwinensis gen. et sp. nov. is represented by a single tooth which has a lingually prominent rectangular coronal base, a long, wide, robust tooth root and a low, medially acuminate crown. The tooth shares the lingually prominent coronal base with the petalodonts and Heteropetalus Lund, 1977. The morphology of the tooth suggests a specialized durophagous diet that may, have included small decapod crustaceans or phyllocarids. The specimen was recovered from residue obtained through acid etching of small limestone blocks collected from Fossil Cliff in the northern part of the Perth Basin. The sediments are glacio-marine in origin and were formed when the Perth Basin was located at a latitude of approximately 70 degrees S. To date a vertebrate fauna comprising symmoriid and stethacanthid shark teeth, a variety of placoid scales, and teeth and scales of palaeoniscoid fish, has been recovered. Author(s) DAYMOND, STEPHEN M. : Part 4 Page Number 371 GONDWANODUS IRWINENSIS GEN. ET. SP. NOV., A NEW ELASMOBRANCH FROM THE EARLY PERMIAN (LATE SAKMARIAN) FOSSIL CLIFF MEMBER OF THE Download 1.58 MB To request an accessible version of this pdf please email email@example.com View the discussion thread.