A new loach, Cobitis shikokuensis (Teleostei: Cobitidae), from Shikoku Island, Japan |
| |
Authors: | Yuzuru Suzawa |
| |
Affiliation: | (1) Institute of River Biology Ltd., 102, 4-27-35 Takadanishi, Kouhoku-ku, Yokohama Kanagawa, 223-0066, Japan |
| |
Abstract: | A new species of spinous loach, Cobitis shikokuensis, is described based on 297 specimens from Shikoku Island, Japan. The new species was formerly known as the Shikoku group of Cobitis takatsuensis. It can be distinguished from other species of Cobitis and closely related genera by a combination of the following characters: dorsal fin with 6 branched soft rays; anal fin with 5 branched soft rays; one brownish streak across eye from the tip of nose, no streak on cheek; a black spot smaller than eye diameter near the dorsal corner of the caudal fin base; 3–5 small brownish speckles on ventral side of caudal peduncle; high caudal peduncle with well-developed fleshy keels on dorsal and ventral side; a lamina circularis at base of dorsal part of pectoral fin absent; first branched soft ray of pectoral fin broad in males; pectoral soft rays widely branched from the approximate midpoint; last anal fin ray with 2 elements; interorbital width 11.2–17.1% of head length. |
| |
Keywords: | Cobitis takatsuensis Spinous loach Kichulchoia brevifasciata Niwaella laterimaculata Lamina circularis |
本文献已被 SpringerLink 等数据库收录! |
|