2024-03-28T09:26:48Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02011275
2022-10-31T06:19:53Z
1642838163960:1642838166499:1642838196741
1642838403551:1642838412624
琉球列島産のヒメオキナガニ属 (甲殻亜門: 十脚目: 短尾下目: ケブカガニ科) について
Notes on some species of the genus Viaderiana Ward, 1942 (Crustacea: Decapoda: Brachyura: Pilumnidae) from the Ryukyu Islands, southern Japan
前之園, 唯史
Maenosono, Tadafumi
沖縄諸島の沿岸域から採集された標本に基づき, ヒメオキナガニ属Viaderiana Ward, 1942 (ケブカガニ科) のニイロケブカガニ (改称) V. incerta (Takeda & Miyake, 1969), オニヒメオキナガニ (新称) V. typica Ward, 1942, ヒメオキナガニV. quadrispinosa (Zehntner, 1894) およびカーミージーケブカガニ (新称) V. longipes (A. Milne-Edwards, 1873) を報告した. 本稿では, これら4種の形態的特徴を記すとともに分類学的な問題にも言及した. 本研究でオニヒメオキナガニと同定した標本は, 眼窩外歯の形状によってV. rotumana (Borradaile, 1900) と区別されたが, V. woodmasoni (Deb, 1987) との識別形質は不明であった. さらにヒメオキナガニと同定した標本は, 雄の腹部の形状と甲の斑紋によってV. xishaensis (Song, 1987) と区別されたが, V. nanshensis (Dai, Cai & Yang, 1994) との違いを見出せなかった. これら各種の識別形質については更なる検討が必要であろう. 加えて, Sakai (1976: pl. 191, fig. 3) で “ヒメオキナガニ” とされていた種は, 甲の形状や額の突出, 甲の色彩から真のV. quadrispinosaではなく, カーミージーケブカガニであることも示した.
Four species of the pilumnid genus, Viaderiana Ward, 1942, viz. V. incerta (Takeda & Miyake, 1969), V. typica Ward, 1942, V. quadrispinosa (Zehntner, 1894), and V. longipes (A. Milne-Edwards, 1873), are reported based on specimens collected from the Okinawa Island Group, Central Ryukyus, southern Japan. Notes on their morphological features and taxonomical problems are provided. The specimens identified as V. typica in the present study are distinguished from V. rotumana (Borradaile, 1900) by having tooth-shaped external orbital angle, but the distinguishable characters between the specimens examined and V. woodmasoni (Deb, 1987) remain unclear. In addition, the specimens identified as V. quadrispinosa in the present study can be distinguished from V. xishaensis (Song, 1987) by proportionally narrower male pleon and different dark pattern on the carapace, but the distinguishable characters between the specimens examined and V. nanshensis (Dai, Cai & Yang, 1994) also remain unclear. The taxonomic status and distinguishable characters of these species need to be reconsidered in future studies. Furthermore, “Litocheira quadrispinosa” recorded by Sakai (1976: pl. 191, fig. 3) from the Ryukyu Islands is found to be V. longipes instead, because of strongly converging posterolateral margin of the carapace, strongly protruding front in dorsal view, and different carapace colouration.
論文
http://purl.org/coar/resource_type/c_6501
Ryukyu University Museum, Fujukan
琉球大学資料館 (風樹館)
2020-12-04
VoR
http://hdl.handle.net/20.500.12000/47427
2187-6657
Fauna Ryukyuana
58
36
15
jpn
https://fauna-ryukyuana.webnode.jp/
open access