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Due to their primitive anatomy, hexanchiforms were previously considered the most basal group of sharks. However, more recent phylogenetic studies indicate that while primitive, they in fact belong to the superorder Squalomorphii, which also contains dogfishes, angelsharks, and sawsharks, although they are thought to be the most basal member of the group.
Cow sharks are a shark family, the Hexanchidae, characterized by an additional pair or pairs of gill slits. Its 37 species are placed within the 10 genera: Gladioserratus , Heptranchias , Hexanchus , Notidanodon , Notorynchus , Pachyhexanchus , Paraheptranchias , Pseudonotidanus , Welcommia , and Weltonia .
The bluntnose sixgill shark (Hexanchus griseus), often simply called the cow shark, is the largest hexanchoid shark, growing to 20 ft (6.1 m) in length. [2] It is found in tropical and temperate waters worldwide and its diet is widely varied by region.
Pages in category "Hexanchidae" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. G. Gladioserratus; H ...
Common name Scientific name authority Preferred habitat IUCN status Range Family Suidae: pigs: Palawan bearded pig: Sus ahoenobarbus Huet, 1888: Forest NT: Bornean bearded pig: Sus barbatus S. Müller, 1838: Wide range of habitats where occurring; Possibly extirpated VU: Visayan warty pig: Sus cebifrons Heude, 1888: Forest and grassland CR ...
The bigeyed sixgill shark (Hexanchus nakamurai) is a cow shark of the family Hexanchidae. Its dorsal surface has a brownish-gray color, and is sharply separated from the light coloring of its ventral surface. The eyes are a fluorescent green while the shark is alive. The body of this shark is small, slim, and fusiform in shape.
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.
Hexanchidae (3 C, 4 P) Pages in category "Hexanchiformes" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. ...