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2018 - vol. 40–47 >

Title :45-5琉球列島より採集された日本初記録のソバカスコブシ (新称) (十脚目: 短尾下目: コブシガニ科)
Title alternative :First record of Leucosia punctata Bell, 1855 (Decapoda: Brachyura: Leucosiidae) from the Ryukyu Archipelago, southwestern Japan
Authors :前之園, 唯史
大澤, 正幸
Authors alternative :Maenosono, Tadafumi
Osawa, Masayuki
Issue Date :10-Sep-2018
Abstract :ソバカスコブシ (新称) Leucosia punctata Bell, 1855について, 琉球列島の沖縄島および 石垣島の沿岸域から採集された標本に基づき, 形態や色彩の特徴を記載した. 標本は水深2 m 以浅の砂底質の海草藻場で採集された. 本報告 は本種の日本初記録であり, その分布の北限記 録を大幅に更新した. 本研究の検討標本は, L. punctataの原記載と異なり鉗脚の長節先端部に小顆粒を欠いていた. これは近似種であるL. affinis Bell, 1855の標徴形質の1つである. 本報 告では琉球列島産の標本を暫定的にL. punctata と同定したが, 両種の分類学的な問題の解決には, より多くの標本に基づいた詳細な検討が必要である.
A rarely recorded leucosiid crab, Leucosia punctata Bell, 1855, is reported from Okinawa and Ishigaki Islands, the Ryukyu Archipelago, southwestern Japan, based on material from seagrass beds in sandy bottoms of the lower intertidal to subtidal depth shallower than 2 m. The present specimens represent the first records of the species from Japanese waters and significantly extend the geographical range to the north. A diagnosis and live coloration of L. punctata are provided. The present specimens are different from the original description of L. punctata by the absence of granules on the dorsodistal portion of the cheliped merus, which is one of the diagnostic characters of morphologically close but poorly known L. affinis Bell, 1855. Relationships of the two species need to be verified by examining the types as well as additional specimens to consider sizes, sexual and local variations, but this study tentatively identified the present specimens as L. punctata.
URL :http://w3.u-ryukyu.ac.jp/naruse/lab/Fauna_Ryukyuana.html
Type Local :雑誌掲載論文
ISSN :2187-6657
Publisher :Ryukyu University Museum, Fujukan
URI :http://hdl.handle.net/20.500.12000/42413
Citation :Fauna Ryukyuana Vol.45 p.19 -25
Appears in Collections:2018 - vol. 40–47

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