Bob Wisner's hagfish

📖 Overview

Bob Wisner's hagfish (Eptatretus bobwisneri) is a ray-finned fish of the family Myxinidae. It inhabits marine (saltwater) waters in deep-water environments. This species can reach a maximum total length of 32.8 cm. It occurs at depths between 512 and 577 metres. With a trophic level of 4, it is a mid-level predator. It is assessed as Least Concern on the IUCN Red List.

🔬 Taxonomy

🐟 Physical Description

This species is distinguished from its congeners except E. gomoni, E. luzonicus, E. octatrema, E. okinoseanus by the following characters: eight pairs of gill apertures that are well-spaced and arranged in an almost straight line; teeth 3/2 multicusps pattern; total cusps 44-47 (vs. 50 in E. gomoni, 38-40 in E. octatrema); prebranchial pores 9-11 (vs. 12-13 in E. gomoni, 22-26 in E. octatrema, 13-17 in E. okinoseanus); trunk pores 43-47 (vs. 57-58 in E. gomoni, 63-68 in E. octatrema, 54-61 in E. okinoseanus); total pores 73-76 (vs. 91-93 in E. gomoni, 77-82 in E. indrambaryai, 84-88 in E. luzonicus, 104-117 in E. octatrema, 87-97 in E. okinoseanus); nasal-sinus papillae absent (vs. one single nasal-sinus papilla in E. luzonicus, two bilaterally symmetrical nasal-sinus papillae in E. octatrema) . : eel-like; Cross section: oval.

🌀 Behaviour

Behavioural data for Bob Wisner's hagfish is currently being reviewed.

🦐 Diet

Diet information for Bob Wisner's hagfish is currently being compiled.

🥚 Reproduction

Copulatory organ absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies .

🌍 Habitat & Distribution

Marine; bathydemersal; non-migratory; depth range 512 - 577 m . Deep-water Southeast Pacific: known only from the Galapagos Islands (Ref.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

🛡️ Conservation Assessment

📊 Population Risk & Fisheries

🌐 Names & Taxonomy

🐠 Related Species

🔍 Similar Species

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 2 records indexed .

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