Diapsids pdf

Dec 5, 1996 - Diapsid. • The name Diapsida means "two arches”. • two ancestral skull openings (temporal fenestrae) posteriorly above and below the eye. • allows attachment With 1 7 figures Classification and phylogeny of the diapsid reptiles MICHAEL J. The genus Petrolacosaurus is the sister-group of all later diapsids which fall Reptiles with two temporal openings in the skull are generally divided into two groups–the Lepidosauria (lizards, snakes, Sphenodon, 'eosuchians') and the The morphology of the anapsid skull is generally regarded as primitive with respect to the more advanced condition of diapsid reptiles (i.e., the presence of twoRequest PDF | Turtles as diapsid reptiles | Recent molecular studies of amniote relationships show turtles to be diapsid reptiles, related to the archosauromorph openings. although those with two. the diapsids. have been further subdivided into the Subclasses Lepidosauria (lizards. snakes. S'henodon. various extinct. Apr 27, 2011 - It is therefore the earliest and most primitive representative of the largest assemblage of fossil and living reptiles, collectively called diapsids. Radiation of Diapsids. Diapsida is a diverse clade of reptiles. Modern diapsids include lizards, snakes, turtles, birds, and crocodylians; extinct diapsids