Bythaelurus canescens

(Günther, 1878)

Dusky catshark
Classification: Elasmobranchii Carcharhiniformes Pentanchidae

Reference of the original description
Günther, A. (1878)
Preliminary notices of deep-sea fishes collected during the voyage of H. M. S. Challenger.' Annals and Magazine of Natural History, (Series 5), 2, 17–28, 179–187, 248–251

Image of the original description
No image in first description.

Synonyms / new combinations and misspellings
Halaelurus canescens, Halaelurus (Bythaelurus) canescens, Scyliorhinus canescens, Scylliorhinus canescens, Scyllium canescens

Bythaelurus canescens
Holotype: BMNH: 1887.12.7.1

Description :

Citation: Bythaelurus canescens (Günther, 1878): In: Database of modern sharks, rays and chimaeras,, World Wide Web electronic publication, Version 07/2024

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Bythaelurus canescens (Günther, 1878), Chile © L. Ignacio Contreras, Laboratorio de Zoología de Vertebrados, Facultad de Ciencias, U. de Chile
Common names
spa Peje gato, spa Pejegato oscuro, spa Pintarroja, spa Tollito, spa Tollo moteado, fra \(T\) Holbiche sombre, eng Cat shark, eng Dusky cat shark, eng Dusky catshark

Short Description
Snout tip not upturned and knoblike, bluntly rounded; eyes in adults 9 to 12 times in distance from snout to first dorsal origin; anterior nasal flaps subtriangular; labial furrows rather short, essentially confined to mouth corners, but lowers extending at least 5 mm onto lower jaw; mouth large, its width 8 to 10% of total length, its length 4 to 5% of total length; oral papillae probably present in pharynx unknown; gills directed laterad, not elevated above level of mouth. First dorsal origin over first third of pelvic bases; second dorsal slightly larger than first, its origin anterior to anal midbase; abdomen moderately elongated in adults, distance between pectoral and pelvic bases 1.2 to 1.5 times the pectoral anterior margin; length of anal base about 1.3 times the second dorsal base, slightly shorter than distance between dorsal bases. Colour dark chocolate brown, without markings except for white fin tips in young. Adults moderately large, 45 to 66 cm long. [517]

Diet: southeast Pacific Ocean (data base: 50 individuals, 37 contained food): Squid, Loligo gahi (28.3% of GI); siphonophore Sulculeolaria quadrivalvis (8.7% of GI), Muggiea atlantica (6.7% of GI), Coelorhynchus fasciatus (6.1% of GI), in groups (Siphonophora 67.92%GI, Cephalopods 20.27%GI, Fishes 11.81%GI) [17753]

Southeast Pacific: Peru and Chile to the Straits of Magellan.

Human uses
fisheries: of no interest

Size / Weight / Age
70.0 cm TL (male/unsexed; [517])

bathydemersal; marine; depth range 250 - 700 m [517]

shark-references Species-ID=651;