Seymouriamorpha

Seymouriamorpha
Temporal range: Early Permian - Late Permian
Skeleton of Seymouria in the National Museum of Natural History
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Subclass: "Labyrinthodontia"
(unranked): Reptiliomorpha
Suborder: †Seymouriamorpha
Watson, 1917
Families

Seymouriamorpha were a small but widespread group of reptiliomorphs. Many seymouriamorphs were terrestrial or semi-aquatic. However, aquatic larvae bearing external gills and grooves from the lateral line system has been found, making them unquestionably amphibians. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to crocodile-sized 150 centimeter long animals. They were reptile-like. Because seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes, or the relatives of the amniotes's ancestor. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, a group that includes the best known genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.

Contents

Taxonomy

Cladogram based on Ruta, Jeffery, & Coates (2003):[2]

Seymouriamorpha

Kotlassia



Utegenia




Seymouria baylorensis


Seymouria sanjuanensis




Ariekanerpeton



Discosauriscus austriacus


Discosauriscus pulcherrimus






Cladogram based on Klembara (2009) & Klembara (2010):[3][4]

Seymouriamorpha

Utegenia



Seymouria



Karpinskiosaurus

Discosauriscidae


Makowskia


Spinarerpeton




Ariekanerpeton


Discosauriscus






Gallery

References

  1. ^ Olson, E. C. (1951). "Fauna of upper Vale and Choza: 1-5 Fieldiana:". Geology 10 (11): 89–128. 
  2. ^ Ruta, M.; Jeffery, J. E.; and Coates, M. I. (2003). "A supertree of early tetrapods". Proceedings of the Royal Society B 270 (1532): 2507–16. doi:10.1098/rspb.2003.2524. PMC 1691537. PMID 14667343. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1691537. 
  3. ^ Klembara, Jozef (2009). "The skeletal anatomy and relationships of a new discosauriscid seymouriamorph from the lower Permian of Moravia (Czech Republic)". Annals of Carnegie Museum 77 (4): 451–483. doi:10.2992/0097-4463-77.4.451. 
  4. ^ Klembara, Jozef (2011). "The cranial anatomy, ontogeny, and relationships of Karpinskiosaurus secundus (Amalitzky) (Seymouriamorpha, Karpinskiosauridae) from the Upper Permian of European Russia". Zoological Journal of the Linnean Society 161 (1): 184–212. doi:10.1111/j.1096-3642.2009.00629.x. 

External links