Longnose sleeper shark

A known holotype sleeper shark with a long pointed and flat snout

The Longnose Sleeper shark (Somniosus sp. A) is a Sleeper shark of the family Somniosidae. The only found shark was found off the coast of Portugal in deep water.


Family: Somniosidae – Sleeper sharks

Genus: Somniosus 

Species: sp. A


Phylum– Chordata

Class– Chondrichthyles



Common NameDogfish Sharks

Family– Somniosidae

Common NameSleeper Sharks


Speciessp. A


Average Size and Length: Known from one species: 2.7 feet.

Teeth and Jaw: The Longnose Sleeper shark has spear-like upper teeth and lower teeth made for cutting with short, low and strongly oblique cusps and high, narrow roots.

Head: The Longnose Sleeper shark has an elongated, pointed and flattened snout. The head is long.

Tail: The caudal peduncle is very long. The caudal fin is short with a long ventral lobe.

Demographic, Distribution, Habitat, Environment and Range: The Longnose Sleeper shark is a holotype, and the only found species was off the coast of Portugal in deep water.

Aesthetic Identification: There are two spineless dorsal fins of equal size on the Longnose Sleeper shark. The first dorsal fin insertion is closer to the pelvic bases rather than the pectoral fins.

Biology and Reproduction: Unknown.

Behavioral Traits, Sensing and Intelligence: Unknown.

Longnose Sleeper Shark Future and Conservation: Not evaluated. Holotype.

Longnose Sleeper Shark Recorded Attacks on Humans: Not a threat to humans.