Eureptilia

Eureptilia ("true reptiles") is one of the two major clades of the Sauropsida, the other being Parareptilia. Eureptilia includes not only all Diapsids, but also a number of primitive Permo-Carboniferous forms previously classified under the Anapsida, in the old (no longer recognised) order "Cotylosauria".

Eureptilians
Temporal range:
Pennsylvanian–Present, 312–0 Ma
Labidosaurikos meachami, an early eureptilian of the family Captorhinidae
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Eureptilia
Olson, 1947
Subgroups

†Brouffia
†Coelostegus
†Thuringothyris
†Captorhinidae
Romeriida

Primitive were all small, superficially lizard-like forms, that probably scurried through the Paleozoic undergrowth in search of insects. The diapsids are the only eureptilian clade to continue beyond the Permian Period. Eureptilia is characterized by the skull having greatly reduced supraoccipital, tabular, and supratemporal bones that are no longer in contact with the postorbital.

Classification

Eureptilia was defined as a stem-based clade, specifically, the most inclusive clade containing Captorhinus aguti and Petrolacosaurus kansensis but not Procolophon trigoniceps, by Tsuji and Müller (2009).[1] The cladogram here was modified after Muller and Reisz (2006):[2]

Reptilia 
 

†Parareptilia

 
 Eureptilia 
 

†Coelostegus

 
 
 
 

†Thuringothyris

 
 

†Captorhinidae

 
 
 
 

†Brouffia

 
 Romeriida 
 

†Paleothyris

 
 
 

†Hylonomus

 
 
 

†Protorothyrididae

 
 

Diapsida

 
 
 
 
 
 
 
 

References
  1. Benton, M. J., Donoghue, P. C., Asher, R. J., Friedman, M., Near, T. J., & Vinther, J. (2015). "Constraints on the timescale of animal evolutionary history." Palaeontologia Electronica, 18.1.1FC; 1-106; palaeo-electronica.org/content/fc-1
  2. Muller, J. and Reisz, R.R. (2006). "The phylogeny of early eureptiles: Comparing parsimony and Bayesian approaches in the investigation of a basal fossil clade." Systematic Biology, 55(3):503-511. doi:10.1080/10635150600755396
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