Edestidae
The Edestidae are a poorly known, extinct Family (biology), family of shark-like eugeneodontid holocephalid cartilaginous fish. Similar to the related family Helicoprionidae, members of this family possessed a unique "tooth-whorl" on the symphysis of the lower jaw and pectoral fins supported by long radials. In addition to having a tooth-whorl on the lower jaw, at least one species of the genus ''Edestus'' had a second tooth-whorl in the upper jaw. The palatoquadrate was either fused to the skull or reduced. Edestids, along with the rest of the Eugeneodontida, are placed within the subclass (biology), subclass Holocephali. The family disappeared in the Early Triassic. References External linksPalaeos Vertebrates 70.100 Chondrichthyes: Eugnathostomata Paleos.comat paleos.comJSTOR: Journal of PaleontologyVol. 70, No. 1 (Jan., 1996), pp. 162-165
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