Biology:Sphenacodontoidea
| Sphenacodontoids | |
|---|---|
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| Fossilized skull of two sphenacodontoids: Clelandina (Therapsida, Gorgonopsidae) and a Dimetrodon (Sphenacodontidae). | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Sphenacomorpha |
| Clade: | Sphenacodontia |
| Clade: | Pantherapsida |
| Clade: | Sphenacodontoidea Marsh, 1878 |
| Clades | |
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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).[1] Sphenacodontoids are characterised by a number of synapomorphies concerning proportions of the bones of the skull and the teeth.[2][3]
The sphenacodontoids evolved from earlier sphenacodonts such as Haptodus and Ianthodon via a number of transitional stages of small, 1-10 kg, faunivore animals.[1] The possible common ancestor of sphenacodontids and therapsids was a carnivorous synapsid that reached moderate or large size and more closely resembled the land-dominant Early Permian sphenacodontids than the small Haptodus.[2] The first predators among Sphenacodontoidea, like Shashajaia, appeared in the tropical western part of Pangea in the Late Carboniferous.[1] Later, in Permian, sphenacodontoids gave rise to the dominant terrestrial carnivores in both sphenacodontid and therapsid groups.[2]
Classification
The following taxonomy follows Fröbisch et al. (2011) and Benson (2012) unless otherwise noted.[4][5]
Class Synapsida
- Sphenacodontoidea
- Family †Sphenacodontidae
- Therapsida
Phylogeny
Sphenacodontoidea in a cladogram modified from Huttenlocker et al. (2021):[1]
| Synapsida |
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See also
References
- ↑ 1.0 1.1 1.2 1.3 Huttenlocker, A. K.; Singh, S. A.; Henrici, A. C.; Sumida, S. S. (2021). "A Carboniferous synapsid with caniniform teeth and a reappraisal of mandibular size-shape heterodonty in the origin of mammals". Royal Society Open Science 8 (12): 211237. doi:10.1098/rsos.211237. PMID 34925870. Bibcode: 2021RSOS....811237H.
- ↑ 2.0 2.1 2.2 R. R. Reisz, David S Berman, Diane Scott (1992). "The cranial anatomy and relationships of Secodontosaurus, an unusual mammal-like reptile (Synapsida: Sphenacodontidae) from the Early Permian of Texas". Zoological Journal of the Linnean Society 104 (2): 127-184. doi:10.1111/j.1096-3642.1992.tb00920.x. https://www.researchgate.net/publication/227670876.
- ↑ "Autapomorphies of the main clades of synapsids". http://tolweb.org/notes/?note_id=466.
- ↑ 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". Acta Palaeontologica Polonica 56 (1): 113–120. doi:10.4202/app.2010.0039. http://www.app.pan.pl/archive/published/app56/app20100039.pdf.
- ↑ 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.
Further reading
- Laurin, M. and Reisz, R. R., 1997, Autapomorphies of the main clades of synapsids - Tree of Life Web Project
External links
- "Synapsida". http://www.fmnh.helsinki.fi/users/haaramo/Metazoa/deuterostoma/chordata/Synapsida/synapsida_1.htm#Sphenacodontidae.
Wikidata ☰ Q5853182 entry
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