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{{Automatic taxobox
| name = Cow sharks
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| subdivision = See text
| authority = [[John Edward Gray|J. E. Gray]], 1851
}}
'''Cow sharks''' are a [[shark]] [[family (biology)|family]], the '''Hexanchidae''', characterized by an additional pair or pairs of [[gill slit]]s. Its 37 species are placed within the 10 genera: ''[[Gladioserratus]]'', ''[[Sharpnose sevengill shark|Heptranchias]]'', ''[[Hexanchus]]'', ''Notidanodon'', ''[[Notorynchus]]'', ''Pachyhexanchus'', ''Paraheptranchias'', ''Pseudonotidanus'', ''[[Welcommia]]'', and ''Weltonia''.<ref>Allen, 45</ref>
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== Species ==
[[File:Hexanchus nakamurai JNC2615 6 gills.JPG|thumb|100px|View of the six gill openings of ''[[Bigeyed sixgill shark|Hexanchus nakamurai]]'']]
The 37 species of cow shark (
* †''[[Gladioserratus]]'' <small>Underwood, Goswami, Prasad, Verma & Flynn, 2011</small>
** †''[[Gladioserratus aptiensis]]'' <small>Pictet, 1864</small>
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