Klassifizierung / Names
Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii (Haie und Rochen) (sharks and rays) >
Rhinopristiformes (Shovelnose rays) >
Rhinobatidae (Guitarfishes)
Etymology: Rhinobatos: Greek, rhinos = nose + Greek, batis, -idos = a ray (Raja sp.) (Ref. 45335); nudidorsalis: Name from Latin 'nudus' meaning bare or naked and 'dorsum' for back, referring to its smooth, denticle-free upper surface.
More on authors: Last, Compagno & Nakaya.
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
seewasser demersal; tiefenbereich ? - 125 m (Ref. 55722). Tropical
Central Indian Ocean: Mascarene Ridge. High Seas only.
Größe / Gewicht / Alter
Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 50.1 cm TL Männchen/unbestimmt; (Ref. 55722)
Kurzbeschreibung
Bestimmungsschlüssel | Morphologie | Morphometrie
This species is distinguished by the following characters: no thorns on upper surface of the disc, with tail and unpaired fins almost entirely naked; a small, elongate to oval-shaped denticle patch across a naked upper caudal peduncle and upper caudal-fin lobe; a wedge-shaped disc; moderately large orbit, exceeding 4% total length (TL); oblique nostrils, length 1.7 times internarial distance; anterior nasal flaps penetrating well into internarial space, but not almost united; posterior nasal flaps broad; ridges of rostral cartilages well separated dorsally and almost parallel; prebranchial sensory pore patch narrow, extending to first gill slit; postscapular sensory canal long with lateral pores, not grooved, extending almost to pectoral-fin insertions; low dorsal fins; pelvic-fin inner margin distinctly longer than its base; interdorsal distance less than 2.5 times first dorsal-fin base; 2 spiracular folds, outer is much larger than the inner one; caudal fin small with dorsal margin about 1.8 times preventral margin; 172 total vertebral centra; dorsal disc plain colored (Ref. 55722).
Body shape (shape guide): elongated.
Offshore on insular shelves of the Central Indian Ocean, distribution probably restricted (Ref. 114953). Maximum size is actually unknown, presumably a small- to moderate-size species given that the half-meter holotype is sexually mature (Ref. 55722). Biology is unknown, more specimens needed (Ref. 114953).
Lebenszyklus und Paarungsverhalten
Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Last, P.R., L.J.V. Compagno and K. Nakaya, 2004. Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean. Ichthyol. Res. 51:153-158. (Ref. 55722)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
Tools
Zusatzinformationen
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Internet Quellen
Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00302 (0.00155 - 0.00589), b=3.13 (2.96 - 3.30), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Trophische Ebene (Ref. 69278) |
3.6 ±0.4 se; based on size and trophs of closest relatives |
Widerstandsfähigkeit (Ref. 120179) |
niedrig, Verdopplung der Population dauert 4,5 - 14 Jahre. (Preliminary low fecundity). |
Anfälligkeit der Fischerei (Ref. 59153) |
Low to moderate vulnerability (31 of 100). 🛈 |