| Family: |
Acanthuridae (Surgeonfishes, tangs, unicornfishes), subfamily: Nasinae |
| Max. size: |
75 cm SL (male/unsexed) |
| Environment: |
reef-associated; marine; depth range 5 - 65 m |
| Distribution: |
Indo-West Pacific: East Africa to the Great Barrier Reef, including the Timor Sea. |
| Diagnosis: |
Dorsal spines (total): 5-5; Dorsal soft rays (total): 28-31; Anal spines: 2-2; Anal soft rays: 26-29. Description: Characterized by bluish grey to olive grey body color, paler on ventral parts; angular, squarish protuberance at front of head in adults; caudal peduncle with pair of bony plates, each with large keel with forward projecting point; greatest depth of body 2.4 (subadults)-3.0 in SL (Ref. 90102). |
| Biology: |
Inhabits steep drop-offs of offshore coral reefs or rocky outcrops (Ref. 37792). Feeds on algae and larger zooplankton (Ref. 37792). Solitary or in groups (Ref. 90102). Minimum depth from Ref. 58018. |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 06 May 2010 Ref. (130435)
|
| Threat to humans: |
harmless |
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