Black membranehead (Hymenocephalus fuscus) is a ray-finned fish of the family Macrouridae. It inhabits marine (saltwater) waters in deep-water environments. This species can reach a maximum total length of 14.8 cm. It occurs at depths between 549 and 1202 metres. With a trophic level of 3.3, it is a low-level carnivore, feeding on invertebrates and small organisms.
This species is distinguished by the following characters: pelvic fin rays 11-12; gill rakers first arch (outer/inner) 12-15/16-19; no or minute barbel; orbit diameter 20-33 % HL; body depth 70-85 % HL; suborbital width 23-28 % HL; snout length 25-33 % HL; upper jaw length 38-48 % H; colour of head and trunk of fresh specimens blackish, tail brownish peppered with melanophores; large, oval, deciduous scales on body and tail .: elongated; Cross section: oval.
Behavioural data for Black membranehead is currently being reviewed.
Marine; bathypelagic; depth range 549 - 1202 m . Subtropical Southwest Pacific: Wanganella Bank, West Norfolk Ridge, off northeast and north coasts of North Island, and northwest Challenger Plateau.
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