Sphenacodontoidea
From Infogalactic: the planetary knowledge core
Sphenacodontoids |
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File:Ctenospondylus2DB2.jpg | |
Ctenospondylus | |
Scientific classification ![]() |
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Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Synapsida |
Clade: | Sphenacodontia |
Clade: | Sphenacodontoidea |
Clades | |
See text. |
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Sphenacodontoidea is a node-based clade that defined to include the most recent common ancestor of the Sphenacodontidae and the Therapsida and their descendants (including mammals). They are defined according to a number of specialised characteristics concerning proportions of the bones of the skull and the teeth.
The Sphenacodontoidea evolved from earlier Sphenacodontia such as Haptodus via a number of transitional stages of small, unspecialised pelycosaurs.
Classification
The following taxonomy follows Fröbisch et al. (2011) and Benson (in press) unless otherwise noted.[1][2]
Class Synapsida
- Sphenacodontoidea
- Family †Sphenacodontidae
- Therapsida
References
- Laurin, M. and Reisz, R. R., 1997, Autapomorphies of the main clades of synapsids - Tree of Life Web Project