Dusky Catshark, Bythaelurus incanus Last & Stevens 2008
Other Names: Sombre Catshark
Holotype of the Dusky Catshark, Bythaelurus incanus, (CSIRO H 1204–02), 454 mm TL) from off Ashmore Reef in theTtimor Sea, depth 900-1000 m . Source: Australian National Fish Collection, CSIRO. License: CC by Attribution-NonCommercial-ShareAlike
Summary:
A uniformly plain greyish catshark known only from a single immature male from off Ashmore Reef in the Timor Sea.
Cite this page as:
Bray, D.J. 2020, Bythaelurus incanus in Fishes of Australia, accessed 20 Apr 2024, https://fishesofaustralia.net.au/Home/species/2620
Dusky Catshark, Bythaelurus incanus Last & Stevens 2008
More Info
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Distribution |
Off Ashmore Reef, Timor Sea, on the mid-Continental Slope. |
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Features |
Head short, broad, width 13.5% TL, length 19.1% TL; short snout, broadly rounded, length 2.5 in HL; anterior nasal flaps triangular; mouth large, width 10.3% TL, length 4.6% TL; short labial furrows confined to mouth corners; small papillae on roof of mouth; abdomen elongate, pectoral-pelvic space 2.8 times length of pectoral-fin anterior margin, 1.7 times interdorsal space; distance of pre-dorsal about 42% TL, 10.9 times eye length; distance of anal-caudal 6.3% TL; origin of first dorsal-fin slightly behind origin of pelvic fin, origin of second dorsal well behind anal-fin mid-base; length of anal-fin base 1.2 times length of second dorsal-fin base, subequal to interdorsal space; flank denticles weakly tricuspidate, with very slender crowns, their length more than twice their width; minute teeth mainly with 4 small cusps, central pair longer than those adjacent, about 100 rows in each jaw; upright flank denticles weakly tricuspidate; precaudal centra about 93, before upper caudal-fin origin. |
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Size |
Immature male 454 mm TL |
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Etymology |
The specific name is from the Latin incanus (= quite grey) in allusion to body and fin coloration. |
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Species Citation |
Bythaelurus incanus Last & Stevens 2008, CSIRO Marine and Atmospheric Research Paper No. 022: 123, figs 1-2. Type locality: south of Roti Island, Ashmore Terrace, Western Australia, 13°06'S, 122°18'E, depth 900-1000 m. |
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Author |
Bray, D.J. 2020 |
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Resources |
Dusky Catshark, Bythaelurus incanus Last & Stevens 2008
References
Compagno, L.J.V., Dando, D. & Fowler, S. 2005. Sharks of the world. Princeton field guides. Harper Collins Publishing Ltd., London, 368 pp. (as Halaelurus sp.)
Last, P.R. & Stevens, J.D. 1994. Sharks and Rays of Australia. Canberra : CSIRO Australia 513 pp. 84 pls. (p. 202, (as Halaelurus sp. A)
Last, P.R. & Stevens, J.D. 2008. Bythaelurus incanus sp. nov., a new deepwater catshark (Carcharhiniformes: Scyliorhinidae) from northwestern Australia. In: Last, P.R., White, W.T. and Pogonoski, J.J. (eds) Descriptions of New Australian Chondrichthyans, pp. 123-127. CSIRO Marine and Atmopspheric Research Paper No. 022. http://hdl.handle.net/102.100.100/118353?index=1
Last, P.R. & Stevens, J.D. 2009. Sharks and Rays of Australia. Collingwood : CSIRO Publishing Australia 2, 550 pp.
Weigmann, S., Kaschner, C.J. & Thiel. R. 2018. A new microendemic species of the deep-water catshark genus Bythaelurus (Carcharhiniformes, Pentanchidae) from the northwestern Indian Ocean, with investigations of its feeding ecology, generic review and identification key. PLoS ONE 13(12): e0207887. https://doi.org/10.1371/journal.pone.0207887
White, W.T. 2015. Bythaelurus incanus. The IUCN Red List of Threatened Species 2015: e.T44171A68610885. https://dx.doi.org/10.2305/IUCN.UK.2015-4.RLTS.T44171A68610885.en. Downloaded on 05 May 2020.
