Keasius

Keasius
Temporal range: 41.2–11.63 Ma Middle Eocene–Middle Miocene
Restoration, with Austromola
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Division: Selachii
Order: Lamniformes
Family: Cetorhinidae
Genus: †Keasius
Welton, 2013
Type species
†Keasius taylori
Welton, 2013
Other species
  • †Keasius parvus
    (Leriche, 1908)
  • †Keasius septemtrionalis
    Reinecke, von der Hocht, & Dufraing, 2015
  • †Keasius rhenanus
    Reinecke, von der Hocht, & Dufraing, 2015
Synonyms
Genus synonymy
Species synonymy
  • K. parvus
      • Cetorhinus parvus
        Leriche, 1908

Keasius is an extinct genus of basking sharks that lived during the Cenozoic. It contains four valid species, which have been found in North America, Europe, and Antarctica.

Palaeobiology

A 2026 study analyzed a regurgitalite produced by either a lamniform or a hexanchid shark which contained remains attibuted to K. cf. septemtrionalis from the Miocene (Burdigalian) of Slovenia, extending it's known range to the southeastern central paratethys ocean.

References

  1. 1 2 Welton, B.J. (2013). "A new archaic basking shark (Lamniformes: Cetorhinidae) from the late Eocene of western Oregon, U.S.A., and description of the dentition, gill rakers and vertebrae of the recent basking shark Cetorhinus maximus (Gunnerus)". New Mexico Museum of Natural History and Science Bulletin. 58: 1–48.
  2. ↑ Leriche, M. (1908). "Sur un appareil fanonculaire de Cetorhinus trouvé à l'état fossile dans le Pliocène d'Anvers". Comptes rendus hebdomadaires des séances de l'Académie des sciences. 146 (16): 875–878.
  3. 1 2 Reinecke, T.; von der Hocht, F.; Dufraing, L. (2015). "Fossil basking shark of the genus Keasius (Lamniforme, Cetorhinidae) from the boreal North Sea Basin and Upper Rhine Graben: evolution of dental characteristics from the Oligocene to late Middle Miocene and description of two new species". Palaeontos. 28: 39–98.
  4. ↑ von der Hocht, F. (1978). "Bestandsaufnahme der Chondrichthyes-Fauna des unteren Meeressandes (Oligozän, Rupelium) in Mainzer Becken". Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie. 15 (3): 77–83.
  5. 1 2 Gašparič, Rok; Kovalchuk, Oleksandr; Mazuch, Martin; Košťák, Martin; Hitij, Tomaž; Kočová Veselská, Martina; Kočí, Tomáš; Barkaszi, Zoltán (2026-07-20). "An Early Miocene regurgitalite containing basking shark remains from Slovenia: insight into cetorhinid paleoecology of the Central Paratethys". Swiss Journal of Palaeontology. 145: 839–849. doi:10.3897/sjp.145.203557. ISSN 1664-2384.