| 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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