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Article
Published: 2022-01-20

Scyliorhinus hachijoensis, a new species of catshark from the Izu Islands, Japan (Carcharhiniformes: Scyliorhinidae)

Graduate School of Oceanography, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, Shizuoka, Japan, 424-8610.
Shimoda Floating Aquarium,3-22-31, Shimoda-shi, Shizuoka, Japan, 415-0023.
Graduate School of Oceanography, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, Shizuoka, Japan, 424-8610. School of Marine Science and Technology, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, Shizuoka, Japan, 424-8610. Kenji Nohara:
Graduate School of Oceanography, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, Shizuoka, Japan, 424-8610.
Pisces Scyliorhinus torazame Scyliorhinus hachijoensis sp. nov. Chondrichthyes morphology

Abstract

A new species of catshark genus Scyliorhinus, S. hachijoensis sp. nov., is described for the islands of Mikurajima, Hachijojima, and Torishima in southeastern Japan. Scyliorhinus hachijoensis has clasper hooks, which is a common feature in males of the most closely related species (S. torazame), but is distinguished by its coloration (presence of dark spots), the height of its anal fin (higher than the caudal peduncle), and the shape of pectoral and pelvic fins, and dermal denticles. Molecular data also corroborates the new species as a distinct and monophyletic taxon by nucleotide sequence analysis of three mitochondrial DNA regions.

 

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