Cromptodon
{{Short description|Extinct genus of cynodonts}}
{{speciesbox
| fossil_range = Anisian
~{{fossilrange|247.2|242}}
| genus = Cromptodon
| parent_authority = Bonaparte, 1972
| species = mamiferoides[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=39176 Cromptodon] at Fossilworks.org
| authority = Bonaparte, 1972
}}
Cromptodon is an extinct genus of cynodonts from the Triassic of Cerro Bayo de Portrerillos, Cerro de las Cabras Formation, Argentina, South America. It is known only from PVL 3858, a mandible.
Description
The skull has been estimated to have a length of {{convert|2.7|cm|in}}.{{cite journal |last=Abdala |first=Fernando |date=2000 |title=Catalogue of non-mammalian cynodonts in the Vertebrate Paleontology Collection of the Instituto Miguel Lillo, Universidad Nacional de Tucumán, with comments on species |url=https://www.researchgate.net/publication/258110074 |journal=Ameghiniana |volume=27 |pages=436–475 }}
The morphology and distribution of the cups on the postcanines is considered to be very similar to Thrinaxodon liorhinus differing in the fact that the cingulum is lingually wider. The coronoid, prearticular and angular processes, Bonaparte considered, were more developed than those in Thrinaxodon, being more similar to Tribolodon (now Bolotridon). The lower postcanines are buccolingually expanded.{{cite journal |last=Bonaparte|first=José F. |title=CROMPTODON MAMIFEROIDES GEN. ET SP. NOV., GALESAURIDAE DE LA FORMACION RIO MENDOZA, MENDOZA, ARGENTINA. (THERAPSIDA - CYNODONTIA) |url=http://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/1395 |journal=Ameghiniana |date=1972 |volume=9 |issue=4 |pages=343–353 |access-date=15 September 2019}}
Classification
Bonaparte originally classified Cromptodon as a galesaurid. In 1991, J. A. Hopson, pointed out a resemblance between the teeth of Cromptodon and juvenile Aleodon and reclassified Cromptodon as a chiniquodontid.{{cite journal |last=Hopson |first=J. A. |date=1991 |title=Systematics of the nonmammalian Synapsida and implications for patterns of evolution in Synapsids |url=https://www.researchgate.net/publication/331763723 |journal=Origins of the Higher Groups of Tetrapods: Controversy and Consensus |pages=635–93 }} In 2003, Fernando Abdala and Norberto P. Giannini systematically described Chiniquodontidae and found both Cromptodon and Aleodon to fall outside of Chiniquodontidae as both lacked features their study found to be diagnostic of the family, although additional material was required to provide a definite taxonomic placement.{{cite journal |last1=Abdala |first1=F. |last2=Giannini |first2=N. P. |date=2003|title=Chiniquodontid cynodonts: systematic and morphometric considerations |journal=Palaeontology |volume=45 |issue=6 |pages=1151–1170 |doi=10.1111/1475-4983.00280 |doi-access=free }} A 2024 study by Agustín G. Martinelli and colleagues once again found Cromptodon to be a chiniquodontid, belonging to the clade Aleodontinae together with Aleodon and Riojanodon.{{cite journal |last1=Martinelli |first1=A. G. |last2=Ezcurra |first2=M. D. |last3=Fiorelli |first3=L. E. |last4=Escobar |first4=J. |last5=Hechenleitner |first5=E. M. |last6=von Baczko |first6=M. B. |last7=Taborda |first7=J. R. A. |last8=Desojo |first8=J. B. |title=A new early-diverging probainognathian cynodont and a revision of the occurrence of cf. Aleodon from the Chañares Formation, northwestern Argentina: New clues on the faunistic composition of the latest Middle–?earliest Late Triassic Tarjadia Assemblage Zone |journal=The Anatomical Record |date=2024 |volume=307 |issue=4 |pages=818–850 |doi=10.1002/ar.25388|pmid=38282519 }}
See also
References
{{Reflist}}
{{Cynodontia|P.}}
{{Taxonbar|from=Q5187635}}
Category:Middle Triassic synapsids of South America