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A new primitive ichthyopterygian Xinminosaurus catactes gen.et.sp.nov.is erected based on a complete skeleton from the Middle Triassic Upper Member of the Guanling Formation at Panxian,Guizhou,southwestern China.It has a suite of uniquely derived char- acters in its dentition,ulna,carpals and tarsals.It is similar to primitive ichthyopterygians in retaining elongated limb bones.The new taxon and a diversity of marine reptiles in Panxian Fauna are the physical markers of the Middle Triassic Biotic radiation.Detailed stud- ies of this fauna will supply essential knowledge on the diversity,migration and paleobiogeographic affinity of Middle Triassic ichthyopterygians.
A new primitive ichthyopterygian Xinminosaurus catactes gen.et.sp.nov.is erected based on a complete skeleton from the Middle Triassic Upper Member of the Guanling Formation at Panxian, Guizhou, southwestern China. It has a suite of uniquely derived char- acters in its dentition, ulna, carpals and tarsals. It is similar to primitive ichthyopterygians in retaining elongated limb bones.The new taxon and a diversity of marine reptiles in Panxian Fauna are the physical markers of the Middle Triassic Biotic radiation. Detective stud- ies of this fauna will supply essential knowledge on the diversity, migration and paleobiogeographic affinity of Middle Triassic ichthyopterygians.