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Protorothyrididae is an extinct family of small, lizard-like reptiles. Their skulls did not have fenestrae, as is also true of modern turtles and tortoises. Protorothyridids lived from the Late Carboniferous to Early Permian periods, in what is now North America.[1][2][3][4] Many genera of primitive reptiles were thought to be protorothyridids. Brouffia, Coelostegus, Paleothyris and Hylonomus, for example, were recently found to be more basal eureptiles.[5]

Temporal range: Pennsylvanian-Asselian, 307.1–294.6 Ma
Life restoration of Protorothyris archeri
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Romeriida
Family: Protorothyrididae
Price, 1937
Type species
Protorothyris archeri
Price, 1937


  1. ^ Llewellyn Ivor Price (1937). "Two new cotylosaurs from the Permian of Texas". Proceedings of the New England Zoölogical Club. 11: 97–102.CS1 maint: Uses authors parameter (link)
  2. ^ Alfred Sherwood Romer (1952). "Late Pennsylvanian and Early Permian Vertebrates of the Pittsburgh-West Virginia Region". Annals of Carnegie Museum. 33: 47–113.CS1 maint: Uses authors parameter (link)
  3. ^ R. L. Moodie (1912). "The Pennsylvanic Amphibia of the Mazon Creek, Illinois, Shales". Kansas University Science Bulletin. 6 (2): 232–259.CS1 maint: Uses authors parameter (link)
  4. ^ Robert L. Carroll and Donald Baird (1972). "Carboniferous Stem-Reptiles of the Family Romeriidae". Bulletin of the Museum of Comparative Zoology. 143 (5): 321–363.CS1 maint: Uses authors parameter (link)
  5. ^ Müller, J.; 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. PMID 16861212.