Helicoprionidae
| Helicoprionidae |
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| Outdated reconstruction of Helicoprion bessonovi | |
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Helicoprionidae
Karpinsky, 1911
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| Type genus | |
| Agassizodus St John and Worthen, 1875[1]
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| Type species | |
| Lophodus variabillis Newberry and Worthen 1870
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Helicoprionidae is an extinct, poorly known family of bizarre holocephalids within the poorly studied order Eugeneodontida. Members of Helicoprionidae possessed a unique "tooth-whorl" on the symphysis of the lower jaw as well as pectoral fins supported by long radials.[2] The closest living relatives of 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.[3]
References
External links
- 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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