Yoshida Ryuta, Naruse Tohru
Tropical Biosphere Research Center, Iriomote Station, University of the Ryukyus, 870 Uehara, Taketomi, Okinawa 907-1541, Japan.; Email:
Tropical Biosphere Research Center, Iriomote Station, University of the Ryukyus, 870 Uehara, Taketomi, Okinawa 907-1541, Japan.; Email: unknown.
Zootaxa. 2016 Jul 20;4139(2):209-20. doi: 10.11646/zootaxa.4139.2.5.
A new rhizocephalan species, Peltogaster unigibba n. sp., is described from the host hermit crab, Pagurixus boninensis (Melin, 1939), from the Bonin Islands, Japan. Of the16 known species of Peltogaster now currently recognised, P. unigibba n. sp., and P. contorta Boschma, 1958 share a left lobe that projects beyond the mantle aperture. The two species can be distinguished from one another by the position of the opening of the mantle aperture. The new species most closely resembles P. naushonensis Reinhard, 1946 in its internal structure, but clearly differs in the relative length of the colleteric glands. Peltogaster unigibba n. sp. represents the first record of a rhizocephalan from the oceanic Bonin Islands, and the second record of a rhizocephalan from an oceanic island in the northern hemisphere.
一种新的根头目物种，单瘤皮鳃蟹奴（Peltogaster unigibba n. sp.），是从日本小笠原群岛的宿主寄居蟹小笠原寄居蟹（Pagurixus boninensis，梅林，1939年）中描述的。在目前已知的16种皮鳃蟹奴物种中，单瘤皮鳃蟹奴和1958年博施马描述的扭曲皮鳃蟹奴（P. contorta）都有一个突出于外套膜孔的左叶。这两个物种可以通过外套膜孔开口的位置相互区分。新物种在内部结构上与1946年莱因哈德描述的瑙申皮鳃蟹奴（P. naushonensis）最为相似，但在粘腺的相对长度上明显不同。单瘤皮鳃蟹奴是小笠原群岛海洋中根头目物种的首次记录，也是北半球海洋岛屿上根头目物种的第二次记录。
