Scyliorhinus hachijoensis

Ito, Fujii, Nohara & Tanaka, 2022



Classification: Elasmobranchii Carcharhiniformes Scyliorhinidae

Reference of the original description
Ito, N. & Fujii, M. & Nohara, K. & Tanaka, S. (2022)
Scyliorhinus hachijoensis, a new species of catshark from the Izu Islands, Japan (Carcharhiniformes: Scyliorhinidae). Zootaxa, 5092(3), 331–349



Description :


Citation: Scyliorhinus hachijoensis Ito, Fujii, Nohara & Tanaka, 2022: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 07/2024

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Scyliorhinus hachijoensis Ito, Fujii, Nohara & Tanaka, 2022 NSMT-P 135960, male, 370 mm TL, (C, D) NSMT-P 135961, female, 322 mm TL (off the east coast of Hachijojima Island). Scale bar = 30 mm © Ito, Fujii, Nohara & Tanaka
Common names
eng Cinder cloudy catshark, Fukami-torazame (jp)

Short Description
Original diagnosis of Ito, Fujii, Nohara & Tanaka, 2022 [30441]: A species of Scyliorhinus distinguished by its anterior nasal flaps not reaching the upper lip (vs. flaps reaching upper lip, and sometimes covering it, in S. canicula, S. cervigoni, S. comoroensis, S. duhamelii, S. garmani and S. stellaris); nasoral grooves absent and posterior nasal flaps situated posterior to excurrent apertures (vs. nasoral grooves prexents and posterior nasal flaps laterally situated in S. canicula and S. duhamelii); mouth length less than half of mouth width (vs. mouth length more than or equal half of mouth width except in S. torazame and S. ugoi); anal fin height more than caudal peduncle height (vs. less than caudal peduncle height in S.boa, S. duhamelii, S. torazame and S. torrei), and greater than or equal to half of mouth width (vs. less than half of mouth width in S. boa, S. capensis, S. duhamelii, S. haeckelii, S. hesperius, S.meadi, S. torazame, S. torrei and S. ugoi); saddles darker than the background color (vs. inconspicuous or absent in S. boa, S. cabofriensis, S. cervigoni, S. duhamelii, S. garmani and S. torrei, and dark lines in S. retifer); body grayish brown to dark brown with well-defined light spots and small dark spots (vs. spots absent in S. retifer, yellow to golden spots in S. capensis, light spots absent in S. cervigoni, S. garmani, S. meadi and S. retifer, and dark spots absent in S. capensis, S. comoroensis, S. hesperius, S. meadi, S. torazame and S. torrei); light spots spiracle-sized or larger (vs. predominantly smaller than spiracles in S. boa, S. cabofriensis, S. canicula, S. duhamelii, S. stellaris and S. ugoi); dark spots smaller than spiracles (vs. predominantly larger than spiracles in S. cervigoni, S. duhamelii, S. garmani, S. haeckelii and S. stellaris); number of monospondylous vertebrae 34–36 (vs. counts higher except in S. duhamelii, S. torazame and S. torrei); clasper with hooks (vs. absent in all other species except S. torazame); accessory terminal cartilage present (vs. absent in S. cabofriensis, S. cervigoni, S. comoroensis, S. duhamelii, S. haeckelii, S. stellaris, S. torrei and S. ugoi); egg case surface with irregularities (vs. smooth in all other species).

Distribution
around the Izu Islands, Japan [30441]

Size / Weight / Age
TL (max): males 416 mm, females: 386 mm TL (types) [30441]

Habitat
marine; depth range 100–600 m [30441]

Dentition
Tooth counts 39/36 (36–49/32–43 in paratypes); teeth morphologically similar in both jaws. Monognathic heterodonty gradual and well developed; anterolateral teeth abruptly larger than symphysial ones and smaller distally; posterior teeth with smaller principal cusps than anterolateral teeth (Fig. 3). Sexual heterodonty weak. Symphysial teeth with principal cusp and one weak cusplet on each side. Anterolateral teeth with more developed principal cusp than symphysial teeth and two to four cusplets; most outside cusplets small and undeveloped when with three or four cusplets. Posterior teeth have two or three cusplets and tilted to the outside; principal cusp weakly developed [30441]

Remarks
shark-references Species-ID=16223