Oxynotus is a genus of sharks in the order Squaliformes, commonly known as the Roughsharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans.
Roughsharks are small to medium in size, ranging from 1.61 to 4.92 feet in length (mature) depending on species. Their bodies are compressed, giving them a triangular cross-section. They have two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Even more so than their relatives, the Dogfishes, they have rough and prickly skin. Unusually among sharks, they also possess a luminous organ. Therefore, these are glowing sharks.