来自日本西表岛的一种新的膨腹蜚蠊（甲壳纲：等足目：尾肢亚目），兼论雄性多态性。

A new species of Expanathura (Crustacea: Isopoda: Anthuroidea) from Iriomote Island, Japan, with a note on male polymorphism.

作者信息

Shiraki Shoki, Shimomura Michitaka, Kakui Keiichi

机构信息

Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.

Seto Marine Biological Laboratory, Kyoto University, Nishimuro 649-2211, Japan.

出版信息

Zootaxa. 2021 Sep 30;5047(3):377-390. doi: 10.11646/zootaxa.5047.3.9.

DOI:10.11646/zootaxa.5047.3.9

PMID:34810840

Abstract

We describe Expanathura monile sp. nov. from Iriomote Island, Okinawa, Japan, northwestern Pacific. This species resembles E. collaris, E. macronesia, and E. haddae in having very broad uropodal rami, a broad telson, and a moderately shortened pleopod 1 endopod, but differs from these three species in the female having (1) the head with a dorsal V-shaped band of brown pigmentation, (2) the antennular flagellum with 34 articles, (3) antennal peduncular article 2 with an outer triangular projection, (4) the uropodal endopod longer than wide, (5) the uropodal exopod with an acute triangular projection, (6) an oval telson, and (7) the posterolateral setae on the telson similar in length. We present a revised key to known species in the genus Expanathura and briefly discuss the male polymorphism observed in E. monile.

摘要

我们描述了来自日本冲绳西太平洋的石垣岛的新物种念珠膨腹蟹（Expanathura monile sp. nov.）。该物种在具有非常宽的尾肢分支、宽阔的尾节以及适度缩短的第一腹肢内肢方面与环纹膨腹蟹（E. collaris）、麦克罗尼西亚膨腹蟹（E. macronesia）和哈氏膨腹蟹（E. haddae）相似，但在雌性方面与这三个物种不同，其具有：（1）头部有一条褐色色素沉着的背侧 V 形带；（2）触角鞭有 34 节；（3）触角柄节第 2 节有一个外部三角形突出；（4）尾肢内肢长大于宽；（5）尾肢外肢有一个尖锐的三角形突出；（6）椭圆形尾节；（7）尾节后侧刚毛长度相似。我们给出了膨腹蟹属已知物种的修订检索表，并简要讨论了在念珠膨腹蟹中观察到的雄性多态性。