Bythaelurus incanus Last & Stevens 2008

Other Names: Dusky Catshark, Sombre Catshark

A Dusky Catshark, Bythaelurus incanus. Source: CSIRO National Fish Collection. License: CC by Attribution-NonCommercial

A uniformly greyish catshark known only from a single immature male collected from deepwater off Ashmore Reef in the Timor Sea.

Cite this page as:
Bray, D.J. 2016, Bythaelurus incanus in Fishes of Australia, accessed 05 Apr 2020,

Bythaelurus incanus Last & Stevens 2008

More Info


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.

Species Citation

Bythaelurus incanus Last & Stevens 2008, CSIRO Mar. Atmosph. Res. Pap. 022: 123, figs 1-2. Type locality: south of Roti Island, Ashmore Terrace, WA [13°06'S, 122°18'E].


Bray, D.J. 2016

Bythaelurus incanus Last & Stevens 2008


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.

Last, P.R. & Stevens, J.D. 2009. Sharks and Rays of Australia. Collingwood : CSIRO Publishing Australia 2, 550 pp.

McCosker, J.E., Long, D.J. & Baldwin, C.C. 2012. Description of a new species of deepwater catshark, Bythaelurus giddingsi sp. nov., from the Galápagos Islands (Chondrichthyes: Carcharhiniformes: Scyliorhinidae). Zootaxa 3221: 48-59.
White, W.T. 2015. Bythaelurus incanus. The IUCN Red List of Threatened Species 2015: e.T44171A68610885. Downloaded on 20 December 2016.

Quick Facts

CAAB Code:37015035

Conservation:IUCN Data Deficient

Depth:900-1000 m

Max Size:45.4 cm TL (immature male)

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