Oxynotidae

Oxynotidae is a family of sharks, commonly known as rough sharks, that are distinguished by their rough, spiny skin. They are found in deep waters around the world, particularly in the Atlantic Ocean. Oxynotidae is a relatively small family, with only about 12 recognized species. These sharks are characterized by their elongated, flattened bodies and their distinctive, thorny skin. Their bodies are typically covered with numerous small, sharp spines, which give them a rough, sandpaper-like texture. The spines serve as a protective mechanism against predators.

Angular roughshark – Oxynotus centrina

Common Names

Members of the Oxynotidae family are commonly known as rough sharks. This name is derived from the presence of the numerous sharp spines that cover their bodies. Some species may also have specific common names, such as the spiny dogfish or the goosefish shark.

Characteristics

Oxynotidae sharks are typically characterized by the following features:

  • Elongated, flattened bodies: They have a distinctive flattened body shape, which helps them maneuver in deep waters.
  • Thorny skin: Their skin is covered in numerous small, sharp spines, giving them a rough texture.
  • Large, prominent eyes: Their eyes are large and well-developed, which helps them see in the dim light of deep waters.
  • Short, broad snout: They have a short, broad snout with a distinctive upturned mouth.
  • Two dorsal fins: They possess two dorsal fins, each with a prominent spine.
  • Small, rounded pectoral fins: Their pectoral fins are small and rounded, which helps them in slow, deliberate swimming.
  • No anal fin: They lack an anal fin.
  • Small gill slits: Their gill slits are relatively small, suggesting that they are not highly active swimmers.
  • Cartilaginous skeleton: Like all sharks, they have a cartilaginous skeleton, which is lighter and more flexible than bone.

Environment

Oxynotidae sharks are found in deep waters around the world, typically at depths of 200 to 1,500 meters (656 to 4,921 feet). They are most commonly found in the Atlantic Ocean, but they can also be found in other oceans, including the Pacific and Indian oceans.

References