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Saccopharyngiformes (Swallowers and gulpers) >
Monognathidae (Onejaws)
Etymology: Monognathus: Greek, monos = one + Greek, gnathos = jaw (Ref. 45335).
Eponymy: Dr Anton Frederik Bruun (1901–1961) was a Danish oceanographer and ichthyologist. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathypelagic; depth range 0 - 3000 m (Ref. 34506). Deep-water
Western Pacific: Vietnam, South China Sea.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 8.0 cm TL male/unsexed; (Ref. 34506)
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 72; Anal soft rays: 42. M. bruuni differs from all other species of the genus except M. jesperseni in having a glandular part of the dorsal fin. Is distinguished by the following combination of characters: head short, snout blunt, skull length 3.8% TL, rostral fang with dorsal profile slightly convex forming an almost straight line with frontal part of skull, dorsal fin origin above myomere number 13, and small pectoral fins (ca. 1% TL).
Body shape (shape guide): eel-like.
Holotype was captured with a ringnet, at a depth of about 4000 m (Ref. 34506).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Bertelsen, E. and J.G. Nielsen, 1987. The deep sea eel family Monognathidae (Pisces, Anguilliformes). Steenstrupia 13(4):141-198. (Ref. 34506)
IUCN Red List Status (Ref. 130435: Version 2025-2)
Threat to humans
Harmless
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