Naso mcdadei Johnson, 2002
Squarenose unicornfish
photo by Hazes, B.

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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