Elasmobranchii (haaien en roggen) (sharks and rays) >
Rajiformes (Skates and rays) >
Rajidae (Skates)
Etymology: Dipturus: Greek, di = two + Greek, pteryx = fin (Ref. 45335); argentinensis: The specific epitet argentinensis is named in reference to the Argentine Sea where the type
material was collected.
Environment: milieu / climate zone / depth range / distribution range
Ecologie
marien benthopelagisch; diepte 87 - 142 m (Ref. 79571). Temperate; 6°C - 9°C (Ref. 79571)
Southwest Atlantic: Argentina, Patagonia.
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 93.5 cm TL mannelijk / geslacht onbekend; (Ref. 79571)
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
This species is distinguished by the following set of characters: the dorsal surface of disc is brown purplish with no distinct ocelli or blotches margined with dark brown on pectoral and pelvic fins; the upper surface of the disc smooth except few small spinules scattered on tip of snout; presence of ocular thorns and absence of scapular thorns; single nuchal thorn may be either present or absent; one median row of 10 to 24 small caudal thorns; the dorsal and caudal fins scattered with very few spinules; 1-2 interdorsal thorns; tail relatively long and thin, approximately half the total length; ventral surface of disc as dark as the upper side, smooth except few small spinules scattered on tip of snout; interbranchial space with no prickles (Ref. 79571).
According to the capture localities of the type specimens, Dipturus argentinensis appears to have a restricted range distribution occurring in the central and southern Patagonian region on the southwest Atlantic. No recorded specimens have been reported northwards 45º S. The region where the type specimens of the Argentine skate were collected is dominated by sub-Antarctic cold-temperate waters with low salinity. These waters have a predominantly NNE flow and form the Patagonian Current (Brandhorst & Castello 1971). Range temperatures and salinities of the localities where the specimens were collected were 5.9-9.38ºC, and 33.24-33.64 ups, respectively. These physical characteristics agree with the Magellanic Biogeographic Province where the specimens have been captured (Ref. 79571).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Díaz de Astarloa, J.M., E Mabragaña, R. Hanner and D.E. Figueroa, 2008. Morphological and molecular evidence for a new species of longnose skate (Rajiformes: Rajidae: Dipturus) from Argentinean waters based on DNA barcoding. Zootaxa 1921:35-46. (Ref. 79571)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2024-2)
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: van geen belang
Tools
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Estimates based on models
Preferred temperature (Ref.
123201): 4.1 - 9.6, mean 7.6 °C (based on 55 cells).
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00131 - 0.00604), b=3.25 (3.08 - 3.42), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.9 ±0.6 se; based on size and trophs of closest relatives
Weerstandsvermogen (Ref.
120179): laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): High vulnerability (57 of 100).
