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The Hexanchiformes / h ɛ k ˈ s æ ŋ k ɪ f ɔːr m iː z / are a primitive order of sharks, [a] numbering just seven extant species in two families. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens.
The shark order Hexanchiformes (in a broad sense, not only comprising the cow sharks, but also including the frilled sharks, Chlamydoselachidae) is often considered the most primitive of extant sharks, since they share some features with Paleozoic and early-Mesozoic shark groups as the Cladoselachiformes.
Chlamydoselachus is a genus of sharks and the sole extant member of the family Chlamydoselachidae, in the order Hexanchiformes. It contains two extant and four extinct species. The most widely known species still surviving is the frilled shark (Chlamydoselachus anguineus).
Based on the few stomach examinations of these sharks, they are thought to feed mainly on small to moderately sized bony fish and bottom dwelling crustaceans. Like all sharks of the order Hexanchiformes found so far, this shark is ovoviviparous, meaning the eggs are retained inside the female's body until hatching. The bigeyed sixgill, after an ...
Komoksodon is an extinct genus of hexanchiform shark known from the Late Cretaceous to the Paleocene.It is the only member of the monotypic family Komoksodontidae. [1] [2]It is represented by a single known species, K. kwutchakuth from the Campanian Northumberland Formation of Canada.
Chlamydoselachidae is a family of primitive deep-sea sharks in the order Hexanchiformes.They are one of only two extant families in the order alongside the cow sharks in the family Hexanchidae, and the only members of the suborder Chlamydoselachoidei.
Hexanchiformes to Lamniformes // Sharks of the world. An annotated and illustrated catalogue of sharks species known to date. ... Wikipedia® is a registered ...
The order Hexanchiformes is a very small and primitive order consisting of cow sharks and frilled sharks. These sharks have only 1 dorsal fin, 6-7 gill slits, and no nictitating membrane on the eyes. Cow sharks are fairly large and stocky, while frilled sharks are smaller and have eel-like bodies.