Hexanchiformes
Hexanchiformes is an order of sharks that includes the cow sharks and the sixgill sharks. These sharks are distinguished by the presence of six or seven gill slits, a feature that sets them apart from most other sharks. They are ancient sharks, with fossils dating back to the Late Cretaceous period. Hexanchiformes are found in deep waters around the world, and play an important role in their respective ecosystems.
Common Names
Hexanchiformes are commonly referred to as cow sharks or sixgill sharks, depending on the species.
Characteristics
Hexanchiformes exhibit a number of distinctive characteristics, including:
- Six or seven gill slits (most sharks have five)
- A single dorsal fin, positioned far back on the body
- A small, pointed snout
- A large, powerful jaw with numerous teeth
- A relatively primitive body form
Environments
Hexanchiformes are found in deep waters around the world, typically inhabiting continental slopes, seamounts, and submarine canyons. These sharks prefer cool, oxygen-rich waters and are often associated with benthic habitats.
References
For further information on Hexanchiformes, consult the following sources: