Eryopoidea are a taxon of

late Carboniferous Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, ...

and

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

temnospondyli Temnospondyli (from Greek τέμνειν, ''temnein'' 'to cut' and σπόνδυλος, ''spondylos'' 'vertebra') is a diverse order of small to giant tetrapods—often considered primitive amphibians—that flourished worldwide during the Carb ...

amphibians, known from North America and Europe. Carroll includes no fewer than ten families, but Yates and Warren replace this with a cladistic approach and include three families, the

Eryopidae Eryopidae were a group of medium to large amphibious temnospondyli, known from North America and Europe. They are defined as all eryopoids with interpterygoid vacuities (spaces in the interpterygoid bone) that are rounded at the front; and larg ...

Parioxyidae ''Parioxys'' is an extinct genus of temnospondyl amphibian from the Early Permian of Texas. History of study The type species, ''Parioxys ferricolus'', was named in 1878 by American paleontologist Edward Drinker Cope based on two badly preser ...

and Zatrachydidae. They define the Eryopoidea as all

Euskelia Euskelia is a clade of extinct Temnospondyl amphibians. ''Euskelia'' is a stem-based taxon including all temnospondyls more closely related to ''Eryops'' than to ''Parotosuchus ''Parotosuchus'' is an extinct genus of capitosaurian temnospondyl ...

in which the

choana The choanae (singular choana), posterior nasal apertures or internal nostrils are two openings found at the back of the nasal passage between the nasal cavity and the throat in tetrapods, including humans and other mammals (as well as crocodilia ...

are relatively rounded and the

iliac blade The crest of the ilium (or iliac crest) is the superior border of the wing of ilium and the superiolateral margin of the greater pelvis. Structure The iliac crest stretches posteriorly from the anterior superior iliac spine (ASIS) to the posteri ...

vertical. A similar definition but without the Euskelia is provided by Laurin and Steyer.

References

External links

Palaeos
– Mikko's Phylogeny Archive {{Taxonbar, from=Q3816041 Carboniferous temnospondyls Permian temnospondyls Pennsylvanian first appearances Permian extinctions Taxa named by Edward Drinker Cope