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 hexanchiform sharks are mysterious creatures that lead secret lives, often in the deepest, darkest, coldest parts of the ocean. Due to the inaccessible depths inhabited by these sharks, we know very little about them.

They occur in deep water throughout the world's oceans and hatch young from eggs inside the body. Appearance: Resembling an eel, this slim shark has a snake-like head and...

The Hexanchiformes are a primitive order of sharks, that numbering just seven extant species in two families. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens. Species are widespread and found across most of the world.

The Hexanchiformes (Cow and Frilled Sharks) comprises two families, four genera, and seven species of morphologically distinct sharks, in that they are the only group to possess six or seven paired gill slits, a single dorsal fin, and an anal fin. Members of this group of moderately sized to very large sharks mostly occupy a benthopelagic habitat.