Threespine grubfish (Simipercis trispinosa), first described by Johnson & Randall, 2006 is a small fish. Adults typically reach 13.50 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 51 to 170 metres. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.
Vertebrae: 30 - 31. This species is distinguished in having 3 dorsal spines; a low naked fleshy nuchal crest ; dorsal angle of opercular bone broad, not forming a distinct exposed, pointed spine. It also has the following features: vomer and palatines edentate; subopercle and preopercle entire; 10 abdominal and 20-21 caudal vertebrae; scales including those on head and pelvic region large and ctenoid; interorbital with a single row of large scales, extending to, or just beyond anterior margin of eye; suborbital scales reaching a vertical between anterior margin of pupil and anterior margin of eye; and, head and body moderately compressed (body width 1.3- 1.55 in depth in adults) .
Behavioural data for Threespine grubfish is currently being reviewed.
Marine; benthopelagic; depth range 51 - 170 m . Tropical
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