Body typically slender and elongate, without scales, encased in a series of bony rings. Snout longer, its length 1.5-2.0 in HL. Superior trunk and tail ridges discontinuous, the trunk ridge arches dorsad on subdorsal rings; inferior trunk ridge ends at anal ring; lateral trunk ridge confluent with inferior tail ridge. Median dorsal snout ridge a litter elevated above nares, entire to irregularly denticulate; opercle with a low,complete or incomplete,ridge angled upward toward gill opening; scutella without longitudinal keels; dermal flaps present or absent in adults. Rings 21-24 + 55-63, darsal-fin rays 24-32, pectoral-fin rays 15-19. Variably near white to almost black, tip of snout often pale in dark fish; body plain, spotted or mottled.
Inhabits subtidal lagoon and seaward reefs, usually among algae or seagrasses. Most are seen on sand and mud areas, prone to currents; usually soft bottom to about 25 m.
Distributed in the Indo-West Pacific from Red Sea and East Africa to New Caledonia, north to southern Japan; Mariana Islands in Micronesia. It is found in Penghu Is., western Taiwan.
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