Cromptodon

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.[1]

Cromptodon
Temporal range: Anisian
~247.2–242 Ma
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Therapsida
Clade: Cynodontia
Family: †Galesauridae
Genus: †Cromptodon
Bonaparte, 1972
Species:
†C. mamiferoides[1]
Binomial name
†Cromptodon mamiferoides[1]
Bonaparte, 1972

Description

The skull has been estimated to have a length of 2.7 centimetres (1.1 in).[2]

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. [3]

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. [4] 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. [5]

See also

References
  1. Cromptodon at Fossilworks.org
  2. Abdala, Fernando (2000). "Catalogue of non-mammalian cynodonts in the Vertebrate Paleontology Collection of the Instituto Miguel Lillo, Universidad Nacional de Tucumán, with comments on species". Ameghiniana. 27: 436–475.
  3. Bonaparte, José F. "CROMPTODON MAMIFEROIDES GEN. ET SP. NOV., GALESAURIDAE DE LA FORMACION RIO MENDOZA, MENDOZA, ARGENTINA. (THERAPSIDA - CYNODONTIA)". Ameghiniana. 9 (4). Retrieved 15 September 2019.
  4. Hopson, J. A. (1991). "Systematics of the nonmammalian Synapsida and implications for patterns of evolution in Synapsids". Origins of the Higher Groups of Tetrapods: Controversy and Consensus: 635–93.
  5. Abdala, Fernando; Giannini, Norberto P. (2003). "Chiniquodontid cynodonts: systematic and morphometric considerations". Palaeontology. 45 (6): 1151–1170. doi:10.1111/1475-4983.00280.


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