Hexanchidae
shark family
Quick Summary
The Hexanchidae family, commonly known as cow sharks, are a group of sharks that includes a few living species and many fossil forms. A key characteristic of these sharks is that they possess one dorsal fin and typically have six gill openings on each side of their head, though some species in the genus Hexanchus may have six pairs of branchial clefts. The most well-known example is the six-gilled shark (Hexanchus griseus), a large species found in warm and temperate seas.1234
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