Tactostoma macropus Bolin, 1939
Longfin dragonfish

Family:  Stomiidae (Barbeled dragonfishes), subfamily: Melanostomiinae
Max. size:  34.3 cm TL (male/unsexed)
Environment:  bathypelagic; marine; depth range 30 - 2000 m
Distribution:  Northwest Pacific: Japan (Ref. 559); Kamchatka and Kuril Islands (Ref. 41668). Eastern Pacific: Bering Sea (Ref. 265) and the Gulf of Alaska to southern California, USA (Ref. 2850), southwards to central Baja California (Ref. 35904). Reported from Chile.
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 14-18; Anal spines: 0-0; Anal soft rays: 19-22; Vertebrae: 79-82. Jet black all over except for the dark gray on the posterior part of the lower jaw; when the thin epidermis is rubbed off, as is difficult to avoid, the dermis shows lead gray; young rich brown in color (Ref. 6885).
Biology:  Mesopelagic migrating into epipelagic at night (Ref. 35904). Oviparous, with planktonic eggs and larvae (Ref. 35904).
IUCN Red List Status: Least Concern (LC); Date assessed: 15 August 2019 Ref. (130435)
Threat to humans:  harmless


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