Monognathus nigeli Bertelsen & Nielsen, 1987

Family:  Monognathidae (Onejaws)
Max. size:  5.7 cm TL (male/unsexed)
Environment:  bathypelagic; marine; depth range 1500 - 3910 m
Distribution:  Eastern Central Atlantic. High Seas only.
Diagnosis:  Dorsal soft rays (total): 82-95; Anal soft rays: 56-60. M. nigeli differs from the other species of the genus by the following combination of characters: head long with elongate, pointed snout and almost straight jaw, skull length 6.0-7.0% TL, rostral fang strongly hooked with distal part in a neatly right angle to dorsal profile of skull, predorsal length 14.5-18.5% TL, anterior anal fin ray below dorsal fin ray nos. 15-21, and 5 lateral, subdermal spots of pigmentation (Ref. 34506).
Biology:  Four "Discovery" specimens were taken in closing nets between 1510 and 3910 m depth, three of these 1500-2000 m, and one 23 m above the bottom. The "Vityaz" specimen was taken between 3000 m and the surface (Ref. 34506).
IUCN Red List Status: Data deficient (DD); Date assessed: 10 July 2014 Ref. (130435)
Threat to humans:  harmless


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