Plainchin dreamarm

📖 Overview

Plainchin dreamarm (Leptacanthichthys gracilispinis) is a ray-finned fish of the family Oneirodidae. It inhabits marine (saltwater) waters in deep-water environments. This species can reach a maximum total length of 0.8 cm. It occurs at depths between 0 and 2000 metres. With a trophic level of 3.7, it is a mid-level predator. It is assessed as Data Deficient on the IUCN Red List.

🔬 Taxonomy

🐟 Physical Description

Dorsal soft rays (total): 4 - 6; Anal soft rays: 5 - 6. Unique among dreamers in having a well-developed mandibular spine and a very elongate and narrow pectoral fin lobe . Dark in color, with the esca unpigmented in patches. Metamorphosed females distinguished by the following characteristics: extremely well developed articular spine, considerably longer than quadrate spine; wide ethmoid cartilage and vomer, wider than distance between anterolateral tips of lateral ethmoids and frontals; presence of vomerine teeth; depressed ethmoid region, nasal foramina narrow and oval in shape; long frontals, anterior in posterior, overhanging and extending past the anterior limits of ethmoid cartilage and vomer; nearly linear dorsal margins of frontals; ; ventromedial extensions of frontals approach each other on midline, making contact with parasphenoid; frontals separated from prootics; presence of pterosphenoid; anterior end of illicial trough wider and shallower than posterior end; extremely well developed sphenotic spines; symphysial cartilage of upper jaw longer than wide; lower jaw with small symphysial spine; hyomandibula with double head; ; deeply notched posterior margin of opercle; short and broad subopercle, dorsal end rounded to bluntly pointed, ventral end rounded; absence of first pharyngobranchial; well developed second pharyngobranchial; second hypobranchial directly articulates with second basibranchial; caudal fin rays without internal pigmentation; illicium longer than length of esca bulb; pterygoiphore of illicium cylindrical throughout its length, emerging on snout from between frontal bones, anterior end slightly exposed, posterior end concealed beneath skin; well developed first ray of dorsal fin; dorsal fin rays 4-6; anal fin rays 5; long and narrow pectoral fin lobe, longer than longest rays of pectoral fin; pectoral fin rays 18-22; coracoid lacking posteroventral process; simple pelvic bones, expanded distally; skin is naked, without dermal spinules; darkly pigmented skin of caudal peduncle extends well past base of caudal fin . Metamorphosed males: long and narrow pectoral fin lobe, longer than longest pectoral fin rays, articulating along the dorsal margin; short and broad subopercle, dorsal end rounded; lower denticular teeth 6; naked skin, without dermal spinules .: short and / or deep.

🌀 Behaviour

Behavioural data for Plainchin dreamarm is currently being reviewed.

🦐 Diet

Diet information for Plainchin dreamarm is currently being compiled.

🥚 Reproduction

Reproduction data for Plainchin dreamarm is currently being compiled.

🌍 Habitat & Distribution

Marine; bathypelagic; depth range 0 - 2000 m , usually 1000 - ? m . Deep-water North Atlantic: including Canada.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

🛡️ Conservation Assessment

📊 Population Risk & Fisheries

🌐 Names & Taxonomy

Scientific Synonyms

🔍 Similar Species

🗺️ Global Occurrence Map

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

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