Small deepwater shark with a long snout and rough skin

The Rough Longnose Dogfish (Deania hystricosa) is a deepwater shark belonging to the family Centrophoridae. Like its name, it has a long snout and rough skin. It was first described by Samuel Garman in 1906 and originally named Acanthidium hystricosa.


Family: Centrophoridae – Gulper Sharks

Genus: Deania

Species: hystricosa


Phylum– Chordata

Class– Chondrichthyles



Common NameDogfish Sharks

Family– Centrophoridae

Common Name– Gulpher Sharks




Average Size and Length: Mature males have been recorded at 2.8 feet. Mature females have been recorded between 3-3.5 feet. The longest recorded has been 3.6 feet.

Teeth and Jaw: The teeth of the Rough Longnose Dogfish differ in in the upper and the lower jaws. The teeth in the lower jaws are bigger, broader with a curved hook to a point. The upper teeth are much smaller and are straight to a point.

Head: The snout of the Rough Longnose Dogfish is long and flat.

Denticles: The skin of the Rough Longnose Dogfish is rough. The dermal denticles are large lateral trunk pitchforked shaped at around 1 mm long.

Tail: There is no subcaudal keel beneath the caudal peduncle.

Demographic, Distribution, Habitat, Environment and Range: The Rough Longnose Dogfish can be found in the east Atlantic. They have been recorded in the Canaries, Madeira, Namibia, South Africa and possibly the Azores. In the northwest Pacific they can be found in Japan and possibly New Zealand. They live over the insular slopes between 1,542-4,265 feet. They prefer depths below 3,281 feet in South Africa. The Rough Longnose Dogfish is considered benthic and epibenthic.

Aesthetic Identification: The Rough Longnose Dogfish is blackish-brown to greyish-brown in color. The first dorsal fin is very long and low. The second dorsal fin is taller, but much shorter than the first dorsal fin. The spines are grooved. There is no anal fin.

Biology and Reproduction: The Rough Longnose Dogfish is ovoviviparous. On record, one female had 12 large eggs.

Behavioral Traits, Sensing and Intelligence: Unknown.

Rough Longnose Dogfish Future and Conservation: There is not enough data to evaluate, but they are of low interest to fisheries. However, they are probably bycatch of deep trawling fisheries.

Rough Longnose Dogfish Recorded Attacks on Humans: Not a threat to humans.