Cromptodon

Cromptodon
Temporal range: Anisian
~247.2–242 Ma
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Family: incertae sedis
Genus: Cromptodon
Bonaparte, 1972
Species:
C. mamiferoides
Binomial name
Cromptodon mamiferoides
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 2.7 centimetres (1.1 in).

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.

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. 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. 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.

See also



This page was last updated at 2024-02-10 11:14 UTC. Update now. View original page.

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