Puneet Varma (Editor)

Romeriida

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Kingdom
  
Animalia

Clade
  
Eureptilia

Higher classification
  
Eureptilia

Phylum
  
Chordata

Scientific name
  
Romeriida

Romeriida httpsuploadwikimediaorgwikipediacommonsthu

Clade
  
Romeriida Gauthier et al., 1988

Similar
  
Eureptilia, Reptile, Protorothyrididae, Chordate, Batrachosauria

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 have proposed that Protorothyrididae is a paraphyletic taxon. Therefore, it is possible that many protorothyridids do not lie within the clade Romeriida.

Several synapomorphies characterize the romeriids. These include the separation of the tabular bone from the opisthotic bone, ventrally keeled anterior pleurocentra, long and slender carpi and tarsi, and overlapping metapodials.

Below is a cladogram showing the placement of Romeriida within Amniota, modified from Hill, 2005:


Cladogram after Müller & Reisz, 2006:

  Polyphyletic Protorothyrididae

References

Romeriida Wikipedia