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 cepedianusBroadnose sevengill shark.
External links
More info (http://www.elasmo-research.org/education/shark_profiles/hexanchiformes.htm)
Haaientanden (1): Notorynchus primigenius is een Hexanchiformes, die nauw verwant is aan de moderne Notorynchus cepedianus (Peron, 1807), ofwel: broadnose sevengill shark.
Sevengill (Cow) Sharks - Underwater Videography: These sharks, from the hexanchidae (cow shark) family, are sometimes referred to as "primitive" sharks as they bear the closest resemblance of any to extinct...
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