Aulotrachichthys nyx Su, Ho & Lin, 2023
Dark-night luminous roughy

Family:  Trachichthyidae (Slimeheads)
Max. size:  8.25 cm SL (male/unsexed)
Environment:  bathypelagic; marine; depth range 195 - 200 m
Distribution:  Northwest Pacific: eastern Taiwan.
Diagnosis:  Dorsal spines (total): 5-5; Dorsal soft rays (total): 13-13; Anal spines: 3-3; Anal soft rays: 8-8; Vertebrae: 27-27. This species is disinguished from its congeners by having the following set of characters: striated area extending posteriorly, slightly beyond middle point on the caudal peduncle, its length 66.7% caudal-peduncle length; D V,13; A III,8; gill rakers on first gill arch 6 + 1 + 14 = 21; abdominal scutes 9; lateral-scale rows 58; body height 34.1% SL; pelvic-fin-anal-fin length 30.3% SL; forehead height 2 4.1% SL; pectoral-fin length 18.1% SL; dorsal-fin-anal-fin length 42.6% SL; dorsal-fin length 35.3% SL; postdorsal length 29.6% SL; length between the end of the anal-fin base to the end of the striated area (A-SA length), 12.4% SL. Colouration: body overall dark-brown, with chest, isthmus, and abdominal scutes uniformly black, and a distinct black vertical line along caudal-fin base (Ref, 129295),
Biology: 
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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