Numbfish

Numbfishes
Lesser electric ray, Narcine bancroftii
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Torpediniformes de Buen, 1926
Family:	Narcinidae T. N. Gill, 1862

The numbfishes are a group of electric rays (order Torpediniformes) in the family Narcinidae. They are bottom-dwelling cartilaginous fishes with large, rounded pectoral fin discs and long tails. They can produce an electric discharge for defense, from which their scientific name is derived (Greek narke, meaning "paralysis").

Members of this family are commonly known as the numbfishes, and are found almost worldwide in warm temperate and tropical continental and continental insular waters. They are strictly marine, so are absent from rivers and lakes. They occur in sandy beaches, muddy enclosed bays, estuaries, off coral reefs and river mouths, and on the upper continental slope to a depth of 1,071 m.

Small to medium-sized rays, adult numbfishes range from 15 to 66 cm long, though most are less than 50 cm. They have oval, rounded, or shovel-shaped pectoral discs and stout tails of equal or longer length. The snout is moderately elongated, rounded, or rounded-angular, differing from the narkids in being supported by broad rostral cartilages. The mouth is straight, with stout, elongated, and highly protrusible jaws and a prominent groove around its periphery. The nostrils are just forward of the mouth and connected to it by a broad groove; the nasal flaps are short, but merged into a broad nasal curtain that overlaps the mouth. The small teeth have a single moderate cusp; the teeth and tooth bands are exposed when the mouth is closed (except in Diplobatis). Two prominent dorsal fins of roughly equal size and a large caudal fin are present.

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Wikipedia