Classification / Names
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Gadiformes (Cods) >
Macrouridae (Grenadiers or rattails)
Etymology: Hymenocephalus: Named for its transparent membrane-like head covering (‘‘hymen head’’) and fragile nature of head bones (Ref. 100825).
Eponymy: William ‘Bill’ Harding Longley (1881–1937) was a Canadian-born botanist and ichthyologist who studied colours and patterns of tropical reef fish. [...] (Ref. 128868), visit book page.
More on authors: Marshall & Iwamoto.
Environment: milieu / climate zone / distribuzione batimetrica / distribution range
Ecologia
marino batipelagico; distribuzione batimetrica 400 - 900 m (Ref. 37108). Deep-water
Western Central Atlantic: Straits of Florida, Gulf of Mexico, Caribbean Sea, and off Rio de Janeiro, Brazil.
Size / Peso / Age
Maturità: Lm ? range ? - ? cm
Max length : 39.5 cm TL maschio/sesso non determinato; (Ref. 115012); peso massimo pubblicato: 270.90 g (Ref. 115012)
Raggi dorsali molli (totale) : 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 (Ref. 98298).
Body shape (shape guide): elongated; Cross section: compressed.
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Cohen, D.M., A.W. Ebeling, T. Iwamoto, S.B. McDowell, N.B. Marshall, D.E. Rosen, P. Sonoda, W.H. Weed III and L.P. Woods, 1973. Fishes of the western North Atlantic. Part six. New Haven, Sears Found. Mar. Res., Yale Univ. (Ref. 37108)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Strumenti
Special reports
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Fonti Internet
Estimates based on models
Preferred temperature (Fonte Biblio.
123201): 7.1 - 13.9, mean 9.5 °C (based on 83 cells).
Phylogenetic diversity index (Fonte Biblio.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00145 (0.00087 - 0.00240), b=3.21 (3.06 - 3.36), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
Trophic level (Fonte Biblio.
69278): 3.5 ±0.4 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Medio, tempo minimo di raddoppiamento della popolazione 1.4 - 4.4 anni (Assuming tmax>3).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (30 of 100).
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