The Paleobiogeography of Shastasaurus

摘要: Publisher Summary This chapter discusses various aspects of the paleobiogeography Shastasaurus. The position and morphology rib articular facets have played an important role in systematics Triassic ichthyosaurs. articulation pattern Jurassic Ophthalmosaurus, Ichthyosaurus, Stenopterygius is different from that Shastasauridae uniform. In Shastasauridae, a fundamentally involving loss parapophysis encountered. cervical vertebrae, present as forms, elongate diapophysis connects to neural arch. region combination with clearly autapomorphic for has been documented Cymbospondylu, Shastasaurus, Californosaurus. It suggested strings vertebrae even isolated dorsal general shastasaurid type which makes contact or truncated by anterior margin can be assigned Cymbospondylus reasonable confidence.