Bregmaceros retrodorsalis

Taxonavigation: Gadiformes

Superregnum: Eukaryota Cladus: Unikonta Cladus: Opisthokonta Cladus: Holozoa Regnum: Animalia Subregnum: Eumetazoa Cladus: Bilateria Cladus: Nephrozoa Superphylum: Deuterostomia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata Megaclassis: Osteichthyes Superclassis/Classis: Actinopterygii Classis/Subclassis: Actinopteri Subclassis/Infraclassis: Neopterygii Infraclassis: Teleostei Megacohors: Osteoglossocephalai Supercohors: Clupeocephala Cohors: Euteleosteomorpha Subcohors: Neoteleostei Infracohors: Eurypterygia Sectio: Ctenosquamata Subsectio: Acanthomorphata Divisio/Superordo: Paracanthopterygii Series: Zeiogadaria Subseries: Gadariae Ordo: Gadiformes

Familia: Bregmacerotidae
Genus: Bregmaceros
Species: Bregmaceros retrodorsalis

Name

Bregmaceros retrodorsalis H.-C. Ho & Endo, 2020

Holotype: MNHN 2002-3218. Paratypes (21): BSKU, MNHN, NSMT.

Type locality: Northern New Caledonia, Coral Sea, 19°01'58.8"S, 163°18'00"E, depth 250–290 meters.

Diagnosis. A species of Bregmaceros with orgin of second dorsal-fin well posterior, above bases of 5th to 7th anal-fin rays and combination of the following characters: a pointed snout distinctly longer than eye diameter; upper lobe of opercle branched distally; body relatively slender, its depth 10.0‒13.0% SL; 13 principal caudal-fin rays (middle 11 branched); 52‒57 second dorsal-fin rays; 58‒63 anal-fin rays; 16‒18 transverse scale rows below orgin of second dorsal-fin; 86‒93 longitudinal scale rows along body axis; vertebrae 55‒58; entire body evenly covered with melanophores, those on lateral sides forming regular longitudinal rows, one melanophores per scale; head and isthmus entirely, but loosely, covered with variably sized melanophores.

Etymology. From Latin retro, back or behind, and dorsum, upper side of an animal, e.g. dorsal-fin in a fish; referring to the backward position of second dorsal fin.

Distribution. Known from southern Japan (Tosa Bay) and the tropical Pacific Ocean (Wallis & Futuna, Vanuatu, Fiji, New Caledonia, and Chesterfield). Bathymetric range 10‒455 m, suggesting diel vertical migration in Tosa Bay.

References

• Ho, H-C., Endo, H. & Chu, T-W. 2020. A new species of the codlet genus Bregmaceros from the western Pacific Ocean (Gadiformes: Bregmacerotidae). Zootaxa 4786(4): 565–573. DOI: 10.11646/zootaxa.4786.4.8 full article pdf Reference page.  [See page 566, Figs. 1–3.]