神奈川県立博物館研究報告(自然科学)
Online ISSN : 2189-6720
Print ISSN : 0453-1906
原著論文
伊豆諸島御蔵島と伊豆大島から確認された日本初記録のアカマユトラギス (新称)Parapercis rubromaculata(ワニギス亜目トラギス科)
和田 英敏 棟方 航平西川 士郎
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研究報告書・技術報告書 フリー

2026 年 2026 巻 55 号 p. 49-58

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抄録
During an ichthyofaunal survey of Mikura-jima Island, Izu Islands (Japan), a single specimen (111.9 mm standard length: SL) of the genus Parapercis (Trachinoidei: Pinguipedidae) was collected from a drop off at 70–100 m depth, off northeastern Mikura-jima Island by line-fishing. The specimen was subsequently identified as Parapercis rubromaculata Ho, Chang & Shao, 2012, having the following combination of characters: dorsal-fin rays V, 21, fourth dorsal-fin spine longest in dorsal-fin spines; anal-fin rays I, 17; pectoral-fin rays 17; pored lateral-line scales 53; gill rakers 5 + 10 = 15; 6 canine teeth in outer row at front of lower jaw; vomer with single row of 7 robust conical teeth; palatines edentate; 10 abdominal and 20 caudal vertebrae; predorsal scales 8, cycloid, reaching vertical above of posterior margin of preopercle; scales on cheek cycloid, reaching vertical below of anterior margin of pupil; posterior margin of subopercle smooth; posterior tip of depressed pelvic fin reaching to second anal-fin soft ray base; 5 broad red wedge-shaped saddles across sides, a pair of small vivid red patches overlying on middle of each saddles; longitudinal series of large irregular yellowish-orange blotches on lower sides from pectoral-fin base to caudal peduncle; dorsal-fin soft-rayed portion with longitudinal row of red spots including 7 of large blackish-red spots and 11 small bright red spots; and caudal fin with relatively large red blotches on base, followed by smaller red blotches and scattered smaller red spots around center and rear of fin. Moreover, four individuals of P. rubromaculata were documented from Izu-oshima Island, Izu Islands by underwater photographs. This species has been previously recorded only from Taiwan and Western Australia. Thus, the present specimen and the underwater photographs from the Izu Islands represent the first Japanese record and northernmost record for the species. The new standard Japanese name “Akamayu-toragisu” is proposed for the species, based on the present specimen from Mikura-jima Island.
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