Penopus japonicus Nielsen & Ohashi, 2011
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 Family:  Ophidiidae (Cusk-eels), subfamily: Neobythitinae
 Max. size:  22.9 cm SL (male/unsexed)
 Environment:  benthopelagic; depth range - 3924 m
 Distribution:  Northwest Pacific: Ryukyus, Japan.
 Diagnosis:  Dorsal soft rays (total): 117-117; Anal soft rays: 89-89; Vertebrae: 75-75. This species is distinguished from the Atlantic species by having fewer rays in the dorsal 117 (vs. 135-158) and anal 89 (vs. 106-122) fins; head squamation restricted to the middle part of the preopercle (vs. head almost fully scaled - over the dorsum, preopercle and the opercle in part); a distinct spine behind the posterior nostril (vs. spine hardly visible); 9 spines on the hind margin of the preopercle (vs. 4-7 spines) (Ref. 87601).
 Biology: 
 IUCN Red List Status: Not Evaluated  (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Capuli, Estelita Emily - 04.08.11

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