Bregmaceros retrodorsalis Ho & Endo, 2020
Back-fin codlet

Family:  Bregmacerotidae (Codlets)
Max. size:  6.4 cm SL (male/unsexed)
Environment:  pelagic-neritic; marine; depth range 10 - 455 m
Distribution:  Western Pacific: southern Japan (Tosa Bay) to Wallis & Futuna, Vanuatu, Fiji, New Caledonia, and Chesterfield.
Diagnosis:  Dorsal soft rays (total): 52-57; Anal soft rays: 58-63; Vertebrae: 55-58. This species is distinguished by the following characters: orgin of second dorsal-fin well posterior, above bases of 5th to 7th anal-fin rays; snout pointed distinctly longer than eye diameter; upper lobe of the opercle branched distally; body is relatively slender, its depth 10.0-13.0% SL; principal caudal-fin rays 13 (middle 11 branched); D2 52.57; A 58-63; transverse scale rows below orgin of second dorsal-fin 16-18; longitudinal scale rows along body axis 86-93; vertebrae 55-58; the entire body evenly covered with melanophores, those on lateral sides forming regular longitudinal rows, one melanophores per scale; head and isthmus are entirely, but loosely, covered with variably sized melanophores (Ref. 123139).
Biology:  The depth range suggests diel vertical migration in Tosa Bay (Ref. 123139).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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