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Scalenodontoides Temporal range: Norian–Rhaetian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Family:	†Traversodontidae
Subfamily:	†Gomphodontosuchinae
Genus:	†Scalenodontoides
Type species
Scalenodontoides macrodontes Crompton & Ellenberger, 1957

Scalenodontoides is an extinct genus of Traversodontidae, a family of herbivorous cynodonts. It lived during the Late Triassic in what is now South Africa. Its type species is Scalenodontoides macrodontes. It was named in 1957 by A. W. Crompton and F. Ellenberger. Arctotraversodon plemmyrodon was originally classified as a species of Scalenodontoides, but was given its own genus in 1992. It is found in the Scalenodontoides Assemblage Zone of the Elliot Formation, which is named for it. It is one of the geologically youngest traversodontids, alongside the putative traversodontid Boreogomphodon. It is closely related to Exaeretodon and Siriusgnathus, but is distinguished by the presence of a shelf-like expansion of its parietal called the nuchal table. Though the largest known complete skull is only 248 millimetres (9.8 in) long, it may have been the largest non-mammalian cynodont, as an incomplete snout would have belonged to a specimen with an estimated skull length of 617 millimetres (24.3 in).

References

1. ^ Crompton & Ellenberger 1957, p. 2.
2. Sues, Hopson & Shubin 1992.
3. Viglietti et al. 2020.
4. Miron et al. 2020, p. 6.
5. Pavanatto et al. 2018.
6. Gow & Hancox 1993, p. 162.
7. Tolchard et al. 2021, p. 14.

Bibliography

• Crompton, A W; Ellenberger, F (1957). "On a new cynodont from the Molteno beds and the origin of the Tritylodontids". Annals of the South African Museum. 44: 1–14.
• Gow, C. E.; Hancox, P. J. (1993). "First complete skull of the Late Triassic Scalenodontoides (Reptilia Cynodontia) from southern Africa". New Mexico Museum of Natural History and Science Bulletin. 3: 161–168.
• Miron, Lívia Roese; Pavanatto, Ane Elise Branco; Pretto, Flávio Augusto; Müller, Rodrigo Temp; Dias-da-Silva, Sérgio; Kerber, Leonardo (2020). "Siriusgnathus niemeyerorum (Eucynodontia: Gomphodontia): The youngest South American traversodontid?". Journal of South American Earth Sciences. 97: 102394. doi:10.1016/j.jsames.2019.102394. ISSN 0895-9811. S2CID 210628164.
• Pavanatto, Ane Elise Branco; Pretto, Flávio Augusto; Kerber, Leonardo; Müller, Rodrigo Temp; Da-Rosa, Átila Augusto Stock; Dias-da-Silva, Sérgio (2018). "A new Upper Triassic cynodont-bearing fossiliferous site from southern Brazil, with taphonomic remarks and description of a new traversodontid taxon". Journal of South American Earth Sciences. 88: 179–196. doi:10.1016/j.jsames.2018.08.016. ISSN 0895-9811. S2CID 135131520.
• Sues, Hans-Dieter; Hopson, James A.; Shubin, Neil H. (1992-06-10). "Affinities of ?Scalenodontoides plemmyridon Hopson, 1984 (Synapsida: Cynodontia) from the Upper Triassic of Nova Scotia". Journal of Vertebrate Paleontology. 12 (2): 168–171. doi:10.1080/02724634.1992.10011447. ISSN 0272-4634.
• Tolchard, Frederick; Kammerer, Christian F.; Butler, Richard J.; Hendrickx, Christophe; Benoit, Julien; Abdala, Fernando; Choiniere, Jonah N. (2021-07-26). "A new large gomphodont from the Triassic of South Africa and its implications for Gondwanan biostratigraphy". Journal of Vertebrate Paleontology. 41 (2): e1929265. doi:10.1080/02724634.2021.1929265. ISSN 0272-4634. S2CID 237517965.
• Viglietti, P.A.; McPhee, B.W.; Bordy, E.M.; Sciscio, L.; Barrett, P.M.; Benson, R.B.J.; Wills, S.; Tolchard, F.; Choiniere, J.N. (2020-06-01). "Biostratigraphy of the Scalenodontoides Assemblage Zone (Stormberg Group, Karoo Supergroup), South Africa". South African Journal of Geology. 123 (2): 239–248. doi:10.25131/sajg.123.0017. eISSN 1996-8590. ISSN 1012-0750. S2CID 225846284.

v t e Cynognathia
Kingdom: Animalia Phylum: Chordata Clade: Synapsida Clade: Therapsida Clade: Cynodontia Clade: Eucynodontia Synapsida see Synapsida Cynodontia see Cynodontia Cynognathia see below↓ Cynognathia
Cynognathia Cynognathus Gomphodontia Gornogomphodon Diademodontidae Diademodon Titanogomphodon Trirachodontidae Cricodon Guttigomphus Impidens Langbergia Trirachodon Sinognathinae Beishanodon Sinognathus Traversodontidae Andescynodon Colbertosaurus Etjoia Luangwa Mandagomphodon Nanogomphodon Pascualgnathus Scalenodon Theropsodon Traversodon Massetognathinae Dadadon? Massetognathus Santacruzodon Arctotraversodontinae Arctotraversodon Boreogomphodon Habayia Maubeugia Microscalenodon Plinthogomphodon Rosieria Gomphodontosuchinae Exaeretodon Gomphodontosuchus Menadon Protuberum Ruberodon Scalenodontoides Siriusgnathus
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