Rhino Filefish

Pale brown to grey in color; two brown stripes on body; adults with yellow spots on head and body; soft dorsal and anal fins yellowish; caudal fin dark brown (Ref. 4421).Description: Characterized further by having shorter snout than first dorsal spine, origin of spine anterior to level of eye; relatively slender body, depth at level of origin of anal fin about 6.0 in SL in juvenile and about 3.5 in adult male; very low second dorsal and anal fins; convex snout profile, especially in male; absence of pelvic rudiment or ventral flap; short and rounded caudal fin (Ref. 90102).

Dorsal spines (total): 2; Dorsal soft rays (total): 43 - 50; Analspines: 0; Analsoft rays: 41 - 46

Inhabits weedy and sandy areas of lagoon and seaward reefs (Ref. 9710). Often found in pairs (Ref. 9710).

Inhabit coastal reefs and enter estuaries. Often in silty habitat and usually on slopes with low rubble reef and rich invertebrate growth, ranging to moderate depths (Ref. 48637). Found on weedy and sandy areas of lagoon and seaward reefs (Ref. 9710). Often found in pairs (Ref. 9710). Sometimes solitary or in groups (Ref. 90102). Juveniles hide or shelter near seawhips or seapens (Ref. 48637).

Pseudalutarius nasicornis (Schlegel)

The adductor mandibulae complex is very much like that of O. longirostris, although the snout is not as elongated. A 1α′ inserts more on the maxilla than the lips, and A 1β′ completely overlies A 1γ.

Where O. longirostris differs from P. melanocephalus, the descriptions also apply to P. nasicornis, with the following exceptions.

There is a larger section of the levator operculi originating from the pterotic, and the retractor interoperculi is present. Obliquus ventralis II is apparently absent.

The general positioning of the dorsal branchial levators seems more primitive than in P. melanocephalus, since all the origins are from the posterolateral face of the prootic, and none from the poorly developed prootic shelf. The small size of the shelf could, of course, be secondary.

小型魚類，不常見，無經濟價值。或以其可愛的模樣而常被飼養於水族館中，供人欣賞。

林清哲2012年4月於南部墾丁海域發現的新紀錄種。