Dipturus nidarosiensis

The Norwegian skate (Dipturus nidarosiensis), or black skate, is a species of skate found at depths of 200 m (660 ft) to over 1,000 m (3,300 ft) in the East Atlantic region.[1][2][3] Initially its range was believed to be restricted to the Norwegian Sea and North Sea to the Bay of Biscay. It is occasionally encountered off the western coast of Ireland, and historically has been found near Rockall and in the Norwegian Deep, though recent surveys have not identified the species there.[1] The species has frequently been confused with other skates, and since the late 1980s it has been confirmed to occur more widely, ranging from Iceland to Morocco, as well as off South Africa and in the Mediterranean Sea.[4][5]

Dipturus nidarosiensis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Rajiformes
Family: Rajidae
Genus: Dipturus
Species:
D. nidarosiensis
Binomial name
Dipturus nidarosiensis
(Storm, 1881)
Synonyms[2]
  • Raja nidarosiensis Storm, 1881 – basionym
  • Dipturus nidrosiensis (Storm, 1881) – misspelling
  • Raia nidrosiensis Storm, 1881 – misspelling
  • Raja nidrosiensis Storm, 1881 – misspelling

This very large skate can reach a total length of up to 2.3 m (7.5 ft).[1] Females grow larger than males.[6] It is all dark brown-grey above, lacking distinct patterns. Its underparts are dark brown and often covered in blackish mucus, which separates it from some other skates in its range where adults generally have pale underparts (an exception is D. oxyrinchus, which however can be distinguished by its narrower snout).[5] At least in the Mediterranean the primary prey are decapod crustaceans, followed by bony fish, while cephalopods, small elasmobranchs and polychaetes occasionally are consumed.[6]

References
  1. Stehmann, M.F.W. (2009). "Dipturus nidarosiensis". IUCN Red List of Threatened Species. 2009. Retrieved 8 April 2014.
  2. Bailly, N. (2013). "Dipturus nidarosiensis (Storm, 1881)". FishBase, World Register of Marine Species. Retrieved 8 April 2014.
  3. Froese, Rainer and Pauly, Daniel, eds. (2017). "Dipturus nidarosiensis" in FishBase. December 2017 version.
  4. Cannas, R.; Follesa, M. C.; Cabiddu, S.; Porcu, C.; Salvadori, S.; Iglésias, S. P.; Deiana, A. M.; Cau, A. (2010). "Molecular and morphological evidence of the occurrence of the Norwegian skate Dipturus nidarosiensis (Storm, 1881) in the Mediterranean Sea". Marine Biology Research. 6 (4): 341. doi:10.1080/17451000903428496.
  5. Last, P.R.; White, W.T.; de Carvalho, M.R.; Séret, B.; Stehmann, M.F.W.; Naylor, G.J.P., eds. (2016). Rays of the World. CSIRO Special Publication. p. 266. ISBN 9781501705328.
  6. Follesa, M.C.; R. Cannas; S. Cabiddu; A. Cau; A. Mulas; C. Porcu; A. Cau (2010). "Preliminary observations of the reproductive biology and diet for the Norwegian skate Dipturus nidarosiensis (Rajidae) from the Central Western Mediterranean Sea". Cybium. 36 (3): 473–477.


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