Trigonotodus

Trigonotodus is an extinct genus of sharks, most likely belonging to the family Alopiidae. This genus includes three extinct species, which span from the early Eocene to the late Oligocene. The largest species, T. alteri,[1] is commonly known as the “Cusped Giant Thresher.” T. alteri is known from the late Oligocene of South Carolina, while the other two species (T. aktugalaicus and T. tusbairicus)[2] are known primarily from Eocene deposits in Kazakhstan.[3][4] This genus is sometimes considered part of the genus Alopias.[3]

Trigonotodus
Temporal range: early Eocene-late Oligocene
35–23 Ma
Lateral tooth of Trigonotodus alteri
Scientific classification
Kingdom:
Animalia
Division:
Chordata
Class:
Chondrichthyes
Order:
Lamniformes
Family:
Alopiidae
Genus:
Trigonotodus

Kozlov, 1999
Type species
Trigonotodus tusbairicus
Kozlov, 1999
Species
  • Trigonotodus aktulagaicus
    (Kozlov, 1999)
  • Trigonotodus tusbairicus
    Kozlov, 1999
  • Trigonotodus alteri
    Kozlov, 2001

References
  1. Kozlov VA (2001). "Novyj vid akuly roda Trigonotodus KOZLOV, 1999 iz oligotsenovykh otlozhenij severnoj ameriki" [A new shark species of the genus Trigonotodus Kozlov, 1999, from Oligocene sediments of Northern America]. Materialy Po Stratigrafii I Paleontologii Urala [Materials on Stratigraphy and Paleontology of the Urals]. 6: 89–91.
  2. Zhelezko VI, Kozlov VA (1999). "Elasmobranhii i biostratigraphia paleogena Zauralia i Srednei Asii" [Elasmobranchii and Palaeogene biostratigraphy of Transural and Central Asia]. Materialy Po Stratigrafii I Paleontologii Urala [Materials on Stratigraphy and Paleontology of the Urals]. Ekaterinburg: UrO RAN. 3: 324.
  3. Jim Bourdon (2006). "Thresher sharks — Lower Eocene - Recent". elasmo.com. Retrieved 2020-02-04.
  4. "Trigonotodus tusbairicus". Shark-References.com. Retrieved 2020-02-04.
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