This species is captured by trawl over sand and muddy bottom between 36-1350 and observed from submersibles to be most abundant between 250-350 m, with only the heads exposed over sandy substrates or resting on the sediment with their bodies in S-shaped curves . Mature females collected 48-62.8 cm TL .
Vertebrae: 158 - 162. Body uniformly grayish or brown to nearly black. Dorsal fin origin well behind pectoral fin tips; pectoral fin rounded, not elongate and well-developed. Posterior nostril a hole above the upper lip, covered by a flap that extends to or below the edge of the mouth. Upper lip lacks barbels between anterior and posterior nostrils. Pores small but conspicuous, SO 1 + 4, IO 4 + 2, POM 6 +2. Teeth small and conical, biserial on anterior vomer and jaws .: eel-like; Cross section: oval.
Behavioural data for Dark deepwater snake-eel is currently being reviewed.
Marine; bathydemersal; depth range 36 - 1350 m , usually 250 - 350 m . Deep-water Northwest Pacific: Taiwan.
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .
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