Triisodon

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Triisodon
Temporal range: 63.3–61.7 
Ma
↓
Torrejonian[1]
Skull of T. quivirensis from New Mexico
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: †Mesonychia
Family: †Triisodontidae
Genus: †Triisodon
Cope, 1881
Species
  • T. quivirensis
  • T. heilprinianus

Triisodon is a genus of extinct

creodonts and mesonychians. The premolar teeth have three points, hence the generic name (tri=three, don=tooth).[citation needed] Cope described the type specimen of T. quivirensis as "about the size of a wolf."[2]
A smaller species has also been identified from the same region. Since material from this genus is incomplete, the exact size of adults and whether they showed sexual dimorphism or regional variations in size is unknown.

Taxonomy

Restoration of T. quivirensis

Triisodon is the

ancient South American ungulates.[4]

Species

  • Genus Triisodon[5]
    • Trisonodon crassicuspus (= T. rusticus, Goniacodon, "Conoryctes")
      • Lower Paleocene (Torrejonian). Much smaller than T. quivirensis and with more elongate third premolar; distinguished from Eoconodon by having a somewhat reduced third molar.
    • Triisodon quivirensis (= T. antiquus)
      • Lower Paleocene (Torrejonian), coexisted in the same habitat with T crassicuspus. Distinguished from T. crassicuspus by much larger size, from Eoconodon as above.
    • Triisodon heilprinianus identified by Cope, 1882[6] on the basis of a single molar, has since been referred to multiple groups. Referred to Eoconodon coryphaeus by Kondrashov and Lucas 2006.

References

  1. ^ "Triisodon". paleobiodb.org. Retrieved 2021-08-28.
  2. JSTOR 982794
    .
  3. ^ "Mesonychians part III: Andrewsarchus and the triisodontines | ScienceBlogs". scienceblogs.com. Retrieved 2019-06-09.
  4. ^ "Palaeos Vertebrates Laurasiatheria: Eparctocyona". palaeos.com. Retrieved 2019-06-09.
  5. ^ Kondrashov, and Spencer Lucas, Peter (January 2006). "EARLY_PALEOCENE_PUERCAN_AND_TORREJONIAN_ARCHAIC_UNGULATES_CONDYLARTHRA_PROCREODI_AND_ACREODI_OF_THE_SAN_JUAN_BASIN_NEW_MEXICO" – via ResearchGate. {{cite journal}}: Cite journal requires |journal= (help)
  6. ^ Journal of Mammalogy. American Society of Mammalogists. 1981. p. 683.

External links

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