Echidna nebulosa is a nocturnal moray. It is white in color, with black blotches, covered in black en yellow spots with white (scribble) markings in between. Usually the head is yellow with a white or dark snout tip. Eyes are yellow. They are commonly solitary.

Unassessed by the IUCN Red list, but this is a fairly common species in the Indo-Pacific region.

They can be found in the Indo-Pacific; from the Red Sea, south to South Africa, and all the way East up to the Western Panamanian coast, the Ryukyu islands, Hawaii and French Polynesia. It is also reported from some sites in the Southeast Atlantic. They prefer open spaces on reef flats and rocky shorelines, in a depth range of 1-18 meters. Juveniles often occupy intertidal pools or find shelter on top of the reef.

Echidna nebulosa are hermaphroditic, meaning they are both male and female. It has been suggested that they are protogynous, starting life as females, and changing into males when conditions are right, but more research has to be done to confirm this.