Nannobrachium achirus (Andriashev, 1962)
Lantern fish
Nannobrachium achirus
photo by Reyes, P.

 Family:  Myctophidae (Lanternfishes), subfamily: Lampanyctinae
 Max. size:  16.2 cm SL (male/unsexed)
 Environment:  bathypelagic, oceanodromous
 Distribution:  Circumglobal from the Subtropical Convergence to south of the Antarctic Polar Front at Weddell-Scotia confluence and northern reaches of Ross Sea, and extending northwards to 21°S in meridional currents.
 Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 13-16; Anal spines: 0-0; Anal soft rays: 15-19; Vertebrae: 36-38. 14-16 AO photophores; 9-12 tooth patches on the lower limb of the second gill arch; 34-38 lateral line organs (Ref. 36121). Pectoral fins relatively long and well developed in juveniles (easily visible in individuals up to about 6 cm SL), progressively becoming relatively shorter, with thicker rays, and covered by skin (in various stages of becoming vestigial between 5-8 cm SL). Adults (greater than 8 cm SL) with vestigial rays buried in skin and not externally visible unless skin abraded or otherwise torn (Ref. 36121).
 Biology:  Oceanic (Ref. 4479) and mesopelagic (Ref. 75154). Usually found below 500 m at night but shallower in upwelling regions.
 IUCN Red List Status: Not Evaluated  (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Jarre-Teichmann, Astrid - 23.01.93
 Modified by: Bailly, Nicolas - 15.07.13
 Checked by: Agustin, Liza Q. - 16.08.94

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