Hexanchiformes
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The Hexanchiformes /hɛkˈsæŋkɪfɔːrmiːz/ are a primitive order of sharks, numbering just seven extant species in two families, Chlamydoselachidae and Hexanchidae. Chlamydoselachidae are also known as fr
Notorynchus cepedianus head 3
Chlamydoselachus anguineus 2
Notidanodon sp. fossil at the Geological Museum, Copenhagen
Paraorthacodus jurensis
Cow shark
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Cow sharks are a shark family, the Hexanchidae, characterized by an additional pair or pairs of gill slits. Its species are placed within the 11 genera: Gladioserratus, Heptranchias, Hexanchus, Notida
Hexanchiformes
…The Hexanchiformes /hɛkˈsæŋkɪfɔːrmiːz/ are a primitive order of sharks, numbering just seven extant species in two families, Chlamydoselachidae and Hexanchidae. Chlamydoselachidae are also known as frilled sharks, these sharks are very rare fishes and typically reside in deeper waters. Hexanchidae are also…
Six gill shark
View of the six gill openings of Hexanchus nakamurai