The Triassic marine reptile Omphalosaurus: osteology, jaw anatomy, and evidence for ichthyosaurian affinities

摘要: Abstract Omphalosaurus is a marine reptile known from the latest Early Triassic to Middle Triassic. It has wide distribution in northern hemisphere, occurring eastern Pacific realm, Spitsbergen, and western Tethys, but remains poorly known. A recently discovered partial skeleton Alps only specimen showing cranial postcranial bones together. described here detail compared other material, especially holotype skull Nevada. Although numerous disarticulated are present Alpine specimen, their identification interpretation difficult. The lower jaw dentition sufficiently well preserved reconstruct morphology, function, tooth replacement. Remarkably, snout of was rather elongate with crushing placed anteriorly. concentrated along midline forms convex upper concave pavement button-like teeth, set p...