Temporal range: 360–251 Ma Early Carboniferous to Early Triassic
St John and Worthen, 1875
Newberry and Worthen 1870
The Helicoprionidae are an extinct, poorly known family of bizarre holocephalids within the poorly understood order Eugeneodontida. Members of the Helicoprionidae possessed a unique "tooth-whorl" on the symphysis of the lower jaw and pectoral fins supported by long radials. The closest living relatives of the Helicoprionidae and all other eugeneodontids are the ratfishes. The anatomy of the tooth-whorl differed amongst genus and species, some possessing complete spirals (such as those of Helicoprion), others possessing halved spirals (seen in Parahelicoprion), and some with wedged half-spirals (seen in Sarcoprion). Each tooth-whorl is thought to be adapted to a different type of prey, and a different predation strategy.
- 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" (PDF). Acta Zoologica. 90: 171–182. doi:10.1111/j.1463-6395.2008.00353.x.
Apart from the type genus, Agassizodus St John and Worthen, 1875; Parahelicoprion Karpinsky, 1924; Campyloprion Eastman, 1902; Sarcoprion Nielsen, 1952; Toxoprion Hay, 1909; Sinohelicoprion Liu and Chang, 1963; Hunanohelicoprion Liu, 1994 and Shaktauites Tchuvashov, 2001.
- 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.
- Fishes and the Break-up of Pangaea edited by Lionel Cavin, A. E. Longbottom, Martha Richter (1825)
- Palaeos Vertebrates 70.100 Chondrichthyes: Eugnathostomata at paleos.com
- JSTOR: Journal of PaleontologyVol. 70, No. 1 (Jan., 1996), pp. 162-165
- More about Chondrichthyes at Denovian Times
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