Hymenocephalus Billsam
📖 Overview
Hymenocephalus Billsam (Hymenocephalus billsam) 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 39.5 cm. It occurs at depths between 400 and 900 metres. With a trophic level of 3.5, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Least Concern on the IUCN Red List.
🔬 Taxonomy
🐟 Physical Description
Dorsal soft rays (total): 10 - 13. This species is distinguished by the following characters: pelvic fin rays 12-14 (usually 13-14); pectoral fin rays 14-17; projecting snout, 20-25% HL; short barbel, 4-5% HL, does not reach vertical through anterior margin of orbit; moderate orbit diameter, 28-35% HL; infraorbital width 12-15% HL; moderately long preopercular supporter, with angle at rear margin, 5-6% HL; 23-28 gill rakers; ventral striae reaching to ½ to ? distance from pelvic fin bases to periproct; otolith has moderately high predorsal lobe, with colliculi separated, closely placed across collum, terminating at some distance from anterior and posterior rims of otolith; otolith length to height (OL:OH), 1.05; total colliculum length to pseudocolliculum length (TCL:PCL), 2.6-2.8 .: elongated; Cross section: compressed.
🌀 Behaviour
Behavioural data for Hymenocephalus Billsam is currently being reviewed.
🦐 Diet
🥚 Reproduction
🌍 Habitat & Distribution
Marine; bathypelagic; depth range 400 - 900 m . Deep-water Central Atlantic: Straits of Florida, Gulf of Mexico, Caribbean Sea, and off Rio de Janeiro, Brazil.
🌿 Ecology
📐 Morphometrics
🌡️ Water Parameters & Tolerance
🛡️ Conservation Assessment
📊 Population Risk & Fisheries
🌐 Names & Taxonomy
| Language | Common Names |
|---|---|
| 🌍CES | hlavoun portorický |
Scientific Synonyms
| Scientific Name | Author | Year | Status |
|---|---|---|---|
| Hymenocephalus billsamorum | Iwamoto | 1990 | Synonym |
🔍 Similar Species
🗺️ Global Occurrence Map
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .
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