About Psammogobius biocellatus (Valenciennes, 1837)
Psammogobius biocellatus is a species of goby. Its body colour varies from dark brown to blackish, with rows of small black spots running along its flanks, and 2 to 3 dark blotches along its back and upper flanks. It has a dark band on the first dorsal fin, additional dark bands on the lower part of the caudal fin, and narrow bands on the pelvic fins. This species reaches a maximum total length of 12 centimetres (4.7 inches). Psammogobius biocellatus is a widespread species. Its distribution ranges from East Africa, through the Western Indian Ocean and the Pacific, east as far as Fiji and Samoa, north to Japan, and south to Australia. This species, commonly called the sleepy goby, inhabits the intertidal zone of estuaries, lagoons, and coastal rivers, and is often found among mangroves. It burrows into silty-sand substrate, and may also occur in the lower reaches of freshwater streams. It regularly buries itself in sand.
