Eryopoidea are a taxon of late Carboniferous

Pennsylvanian

The Pennsylvanian is, in the ICS geologic timescale, the younger of two subperiods of the Carboniferous Period. It lasted from roughly . As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain...

 and Permian

Permian

The PermianThe term "Permian" was introduced into geology in 1841 by Sir Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil; Murchison asserted in 1841 that he named his "Permian...

 temnospondyli

Temnospondyli

Temnospondyli is a diverse order of small to giant tetrapods—often considered primitive amphibians—that flourished worldwide during the Carboniferous, Permian, and Triassic periods. A few species continued into the Cretaceous. Fossils have been found on every continent...

 amphibians, known from North America and Europe. Carroll includes no less than ten families, but Yates and Warren replace this with a cladistic approach and include only two Permian families, the Eryopidae

Eryopidae

Eryopidae are a family of medium to large Permian temnospondyli amphibians, known from North America and Europe. They are defined cladistically as all Eryopoidea with interpterygoid vacuities that are rounded at the front; and large external nares...

 and Zatrachydidae

Zatrachydidae

The Zatrachydidae are a family of late Carboniferous and Early Permian temnospondyl amphibians, known from North America and Europe. They are distinguished by lateral bony protuberances of the Quadratojugal bone of the skull, and a large opening in the palate. The skull is flattened, with...

. They define the Eryopoidea as all Euskelia

Euskelia

Euskelia is a clade of extinct Temnospondyl amphibians.-References:*Yates, A. M. & Warren, A. A. , The phylogeny of the 'higher' temnospondyls and its implications for the monophyly and origins of the Stereospondyli. Zoological Journal of the Linnean Society 128: 77-121....

 in which the choana

Choana

Choana is the posterior nasal aperture.The choanae are separated by the vomer.- Boundaries :It is the opening between the nasal cavity and the nasopharynx....

 are relatively rounded and the iliac blade vertical. A similar definition but without the Euskelia is provided by Laurin and Steyer.

External links

• Palaeos
• Eryopoidea – Mikko's Phylogeny Archive