Hexanchidae
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Heptranchias perlo
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Hexanchidae (cow sharks) are charatcterized by extra pairs of gill slits.
There are four species of cow shark: Heptranchias perlo (Sharpnose sevengill shark), Hexanchus griseus (Bluntnose sixgill shark), Hexanchus vitulus (Bigeye sixgill shark) and Notorynchus cepedianus Broadnose sevengill shark. <stub>