Cromptodon

In today's world, Cromptodon has become a topic of great importance and relevance. Since its emergence, it has captured the attention of a large number of individuals, either due to its direct impact on society or due to its influence in different areas. Cromptodon has generated controversy, debate and discussion, and its presence continues to generate interest and curiosity in those who wish to further understand its meaning and scope. In this article, we will explore the different aspects related to Cromptodon, from its origin to its evolution in the present, with the aim of providing a comprehensive and comprehensive view on the topic.

Cromptodon
Temporal range: Anisian
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Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Family: incertae sedis
Genus: †Cromptodon
Bonaparte, 1972
Species:
†C. mamiferoides[1]
Binomial name
†Cromptodon mamiferoides[1]
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.[1]

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] 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.[6]

See also

References

  1. ^ a b 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. (1972). "CROMPTODON MAMIFEROIDES GEN. ET SP. NOV., GALESAURIDAE DE LA FORMACION RIO MENDOZA, MENDOZA, ARGENTINA. (THERAPSIDA - CYNODONTIA)". Ameghiniana. 9 (4): 343–353. 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, F.; Giannini, N. P. (2003). "Chiniquodontid cynodonts: systematic and morphometric considerations". Palaeontology. 45 (6): 1151–1170. doi:10.1111/1475-4983.00280.
  6. ^ Martinelli, A. G.; Ezcurra, M. D.; Fiorelli, L. E.; Escobar, J.; Hechenleitner, E. M.; von Baczko, M. B.; Taborda, J. R. A.; Desojo, J. B. (2024). "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". The Anatomical Record. 307 (4): 818–850. doi:10.1002/ar.25388. PMID 38282519.