Diancistrus jackrandalli Schwarzhans, Møller & Nielsen, 2005
Randall's coralbrotula
Diancistrus jackrandalli
photo by W. Schwarzhans et al.

Family:  Dinematichthyidae (Viviparous brotula)
Max. size:  7.9 cm SL (male/unsexed)
Environment:  reef-associated; marine; depth range 2 - 4 m
Distribution:  Northwest Pacific: Ryukyu Islands, Japan.
Diagnosis:  Dorsal soft rays (total): 76-79; Anal soft rays: 60-67; Vertebrae: 40-41. The species is distinguished by the following: Vertebrae 11+29-30=40-41, dorsal fin rays 76-79, anal fin rays 60-67; small eyes (1.6-2.1% SL); outer pseudoclasper moderately large, wing- shaped, slightly bent outwards; inner pseudoclasper almost free, bifurcate, with stout hook-like anterior branch and broad flap-like posterior branch; scale patch on cheek with 6-7 rows of small scales on upper cheek, 2 large scales on operculum above opercular spine; head massive, broad; otolith length to height ratio 2.1. This is the only species of the genus which combines small eyes (about 2.1% SL) with presence of scales on the operculum (Ref. 57884).
Biology: 
IUCN Red List Status: Data deficient (DD); Date assessed: 15 August 2019 Ref. (130435)
Threat to humans:  harmless


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