Cocotropus Masudai (Cocotropus masudai), first described by Matsubara, 1943 is a small fish in the family Aploactinidae (order Perciformes). Adults typically reach 5.00 cm in maximum length. It inhabits marine coastal and open-ocean environments. It occurs in Temperate waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus.
Dorsal spines (total): 12; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 7; Vertebrae: 26. Body compressed and somewhat sparsely covered with rather soft prickles. Preoperculum with 5 spines; uppermost longest with a cutting end; lowest rudimentary and embedded . Snout in lateral profile concave. Streaks on body few, if any .: elongated; Cross section: compressed.
Behavioural data for Cocotropus Masudai is currently being reviewed.
Marine; demersal. Temperate Northwest Pacific: known only from Hachijojima, Japan.
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