Sphenacodontoidea

Sphenacodontoidea is a node-based clade that is defined to include the most recent common ancestor of Sphenacodontidae and Therapsida and its descendants (including mammals). Sphenacodontoids are characterised by a number of synapomorphies concerning proportions of the bones of the skull and the teeth.

Sphenacodontoids
Temporal range: Late Carboniferous-Recent,
Fossilized skull of two sphenacodontoids : Clelandina (Therapsida, Gorgonopsidae) and a Dimetrodon (Sphenacodontidae).
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Sphenacomorpha
Clade: Sphenacodontia
Clade: Pantherapsida
Clade: Sphenacodontoidea
Clades

The sphenacodontoids evolved from earlier sphenacodonts such as Haptodus via a number of transitional stages of small, unspecialised pelycosaurs.

Classification

The following taxonomy follows Fröbisch et al. (2011) and Benson (2012) unless otherwise noted.[1][2]

Class Synapsida

See also

References
  1. Jörg Fröbisch; Rainer R. Schoch; Johannes Müller; Thomas Schindler; Dieter Schweiss (2011). "A new basal sphenacodontid synapsid from the Late Carboniferous of the Saar-Nahe Basin, Germany" (PDF). Acta Palaeontologica Polonica. 56 (1): 113–120. doi:10.4202/app.2010.0039.
  2. Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10 (4): 601–624. doi:10.1080/14772019.2011.631042. S2CID 84706899.
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