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Trigonias osborni Lucas 1900 (rhinoceros)

Osteichthyes - Perissodactyla - Rhinocerotidae

PaleoDB taxon number: 52444

Synonyms: Caenopus premitis Gregory and Cook 1928 (no. 44754), Procaenopus premitis Gregory and Cook 1928 (no. 50682), Trigonias cooki Wood 1931 (no. 52441), Trigonias hypostylus Gregory and Cook 1928 (no. 52443), Trigonias paucidens Wood 1927 (no. 52445), Trigonias precopei Gregory and Cook 1928 (no. 52446), Trigonias preoccidentalis Gregory and Cook 1928 (no. 52447), Trigonias taylori Gregory and Cook 1928 (no. 52448), Trigonias tetradactylum Osborn 1923 (no. 52449)

Full reference: F. A. Lucas. 1900. A New Rhinoceros, Trigonias osborni, from the Miocene of South Dakota. 23(1207):221-223

Belongs to Trigonias according to D. R. Prothero 2005

Sister taxon: Trigonias wellsi

Type specimens:

  • Trigonias osborni: USNM 3924, a partial skull (the anterior part of the palatal portion of the cranium bearing on the right side three incisors, a canine, and the first three premolars, and on the left side )
  • Caenopus premitis: Its type locality is Trigonias Quarry, which is in a Chadronian fluvial-lacustrine volcaniclastic in the Chadron Formation of Colorado.
  • Trigonias cooki: UCM 1053.
  • Trigonias hypostylus: Its type locality is Trigonias Quarry, which is in a Chadronian fluvial-lacustrine volcaniclastic in the Chadron Formation of Colorado.
  • Trigonias paucidens: Its type locality is Quinn Draw (Lower Titanotherium Beds), which is in a Chadronian terrestrial horizon in the Chadron Formation of South Dakota.
  • Trigonias precopei: Its type locality is Trigonias Quarry, which is in a Chadronian fluvial-lacustrine volcaniclastic in the Chadron Formation of Colorado.
  • Trigonias preoccidentalis: Its type locality is Trigonias Quarry, which is in a Chadronian fluvial-lacustrine volcaniclastic in the Chadron Formation of Colorado.
  • Trigonias taylori: Its type locality is Trigonias Quarry, which is in a Chadronian fluvial-lacustrine volcaniclastic in the Chadron Formation of Colorado.
  • Trigonias tetradactylum:

Ecology: scansorial insectivore

Average measurements (in mm): M1 35.6 x 42.6, M2 42.0 x 48.0, M3 39.1 x 43.6, m1 27.7 x 19.6

Estimated body mass: 391.4 kg based on M3 length