Helicoprionidae

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Helicoprionidae
Temporal range: 358–252  Ma
Helicoprion reccon.png
Helicoprion
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order:† Eugeneodontiformes
Clade:† Edestoidea
Family:† Helicoprionidae
Karpinsky, 1911
Type genus
Helicoprion
Karpinsky, 1899 [1]
Type species
Helicoprion bessonowi
Karpinsky, 1899
Genera [2]
Synonyms
  • Agassizodontidae Zangerl, 1981 [1]

Helicoprionidae (sometimes referred to as Agassizodontidae) [3] is an extinct family of holocephalans within the order Eugeneodontida. Members of the Helicoprionidae possessed a "whorl" of tooth crowns connected by a single root along the midline of the lower jaw. [3] [4] While historically considered elasmobranchs related sharks and rays, [3] the closest living relatives of the Helicoprionidae and all other eugeneodonts are now thought to be the ratfishes. [5] The anatomy of the tooth-whorls vary between taxa, with some possessing highly specialized, coiling spirals (such as those of the namesake genus Helicoprion ), while others such as Sarcoprion and Parahelicoprion possessed shorter whorls. [3]

References

  1. 1 2 Lebedev, O. A. (2009). "A new specimen of Helicoprion Karpinsky, 1899 from Kazakhstanian Cisurals and a new reconstruction of its tooth whorl position and function". Acta Zoologica. 90: 171–182. doi:10.1111/j.1463-6395.2008.00353.x.
  2. ↑ Lebedev, O. A.; Itano, W. M.; Johanson, Z.; Alekseev, A. S.; Smith, M. M.; Ivanov, A. V.; Novikov, I. V. (2022). "Tooth whorl structure, growth and function in a helicoprionid chondrichthyan Karpinskiprion (nom. nov.) (Eugeneodontiformes) with a revision of the family composition". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 113 (4): 337–360. doi:10.1017/S1755691022000251.
  3. 1 2 3 4 Zangerl, Rainer (1981). Chondrichthyes 1: Paleozoic Elasmobranchii (Handbook of Paleoichthyology). Friedrich Pfiell. pp. 74–94. ISBN   978-3899370454.
  4. ↑ Cicimurri, D. J.; Fahrenbach, M. D. (2002). "Chondrichthyes from the upper part of the Minnelusa Formation (Middle Pennsylvanian: Desmoinesian), Meade County, South Dakota" (PDF). Proceedings of the South Dakota Academy of Science. 81: 81–92.
  5. ↑ Nelson, Joseph S.; Grande, Terry; Wilson, Mark V. H.; Wilson, Mark V. (2016). Fishes of the world (5th ed.). Hoboken, New Jersey: John Wiley & Sons. pp. 48–50. ISBN   978-1-118-34233-6.


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