Romeriida

Romeriida is a clade of reptiles that consists of diapsids and the extinct protorothyridid genus paleothyris, if not the entire family protorothyrididae. it is phylogenetically defined by Laurin & Reisz (1995) as the last common ancestor of paleothyris and diapsids, and all its descendants. it is named after Alfred Romer, a prominent vertebrate paleontologist of the twentieth century

protorothyridids were once placed in the family Romeriidae along with the captorhinid romeria, because Romeria is now considered to be a captorhinid, and captorhinidae is placed outside Romeriida, the genus is excluded from the clade. protorothyridids were once the collective term for several Romeriid genera of uncertain classification. however more recent studies proposed that protorothyrididae is a paraphyletic taxon. therefore, it is possible that many protorothyridids do not lie within the clade Romeriida

several synapomorphies characterized the Romeriids. these include the separation of the tabular bone from the opisthotic bone, ventrally keeled anterior pluerocentra, long and slender carpi and tarsi, overlapping metapodials

genera
hylomonus

clade:diapsida

paleothyris

family:protorothyrididae

anthracodromeus

cephalerpeton

protorothyris

clade:neodiapsida

mycterosaurus

heleosaurus

clade:parareptilia

node:ankyramorpha

lanthanosuchus

superfamily:parieasauroidea

scutosaurus

parieasaurus

embrithosaurus

Rhipaeosaurus

arganaceras

provelosaurus