Hexanchus

Common Names

Members of the genus Hexanchus are commonly referred to as "sixgill sharks" due to their distinctive six gill slits. The specific common names vary depending on the species: the bluntnose sixgill shark is also known as the "grey sixgill shark" or "cow shark," while the common sixgill shark is sometimes called the "bluntnose sixgill shark" or "bluntnose shark."

Characteristics

Hexanchus sharks are typically large, with the bluntnose sixgill shark reaching lengths of up to 5.5 meters (18 feet) and the common sixgill shark reaching up to 4.3 meters (14 feet). They have elongated, slender bodies with a pointed head and a large, wide mouth. Their six gill slits are located on the sides of their head, rather than the underside like in most other sharks. Other distinguishing features include a single dorsal fin positioned far back on the body, an anal fin, and two small pelvic fins. Their skin is covered in tiny, overlapping scales that give it a rough texture.

Environments

Hexanchus sharks are found in deep waters, generally at depths of 200 to 1,000 meters (660 to 3,300 feet), but sometimes venturing closer to the surface. They have a global distribution, inhabiting temperate and tropical oceans around the world. These sharks are generally solitary animals, preferring to live on the ocean floor.

References

For further information on Hexanchus, consult these reliable sources:

• FishBase
• Florida Museum of Natural History
• Elasmo Research