Seymouriamorpha
Template:Short description Template:Automatic taxobox
Seymouriamorpha were a small but widespread group of limbed vertebrates (tetrapods). They have long been considered stem-amniotes (reptiliomorphs), and most paleontologists still accept this point of view, but some analyses suggest that seymouriamorphs are stem-tetrapods (not more closely related to Amniota than to Lissamphibia).[1]
Many seymouriamorphs were terrestrial or semi-aquatic. However, aquatic larvae bearing external gills and grooves from the lateral line system have been found, making them unquestionably non-amniotes. As they matured, they became more terrestrial and reptile-like. They ranged from 30 cm (1 ft) long lizard-sized creatures to the 1.5 m (5 ft) long Enosuchus. If seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes.
Seymouriamorphs are divided into three main groups: Kotlassiidae, Discosauriscidae, and Seymouriidae, which includes the best-known genus, Seymouria. The last seymouriamorphs became extinct by the end of the Permian.[2]
They have been considered to be the makers of the trace fossils placed in the ichnogenus Amphisauropus.[3]
Taxonomy
- Biarmica
- Enosuchus
- Kotlassia
- Leptoropha
- Microphon
- Nyctiboetus
- Utegenia
- Waggoneria[4]
- Family Karpinskiosauridae
- Family Discosauriscidae
- Family Seymouriidae
Cladogram based on Ruta, Jeffery, & Coates (2003):[5]
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Cladogram based on Klembara (2009) & Klembara (2010):[6][7]
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Gallery
References
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