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Sphenacodontoidea : ウィキペディア英語版 | Sphenacodontoidea
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. Class Synapsida * Sphenacodontoidea * * Family †Sphenacodontidae * * Therapsida
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