A new hermit crab of the genus Calcinus from Rapa Island, French Polynesia with affinities to Calcinus dapsiles Morgan, 1989 and Calcinus sirius Morgan, 1991 (Decapoda: Anomura: Diogenidae)

Abstract A new hermit crab of the genus Calcinus Dana, 1851 is described from a specimen collected at a depth of 100 m near Rapa Island, Austral Islands, French Polynesia. In a previous report, we had reported this specimen provisionally as Calcinus aff. sirius, pending availability of live color data for Calcinus sirius Morgan, 1991. Recently obtained color photographs of live C. sirius from the Solitary Islands, Eastern Australia, has shown that the specimen from Rapa Island is distinct from Morgan’s taxon and represents a new species which is fully illustrated and described herein as Calcinus shawi sp. nov. The morphology and coloration of this new species are compared with the closely allied C. sirius and Calcinus dapsiles Morgan, 1989.

摘要 本文记述采自法属波利尼西亚南方群岛拉帕岛附近水深100米处的一件标本，该标本隶属于细螯寄居蟹属（Calcinus Dana, 1851），为一新种。此前在一篇报告中，因暂未获取1991年Morgan发表的Calcinus sirius（西里斯细螯寄居蟹）的活体色彩数据，我们曾将该标本暂定名为Calcinus aff. sirius（西里斯细螯寄居蟹近似种）。近期我们获得了采自澳大利亚东部孤群岛的活体C. sirius（西里斯细螯寄居蟹）的彩色照片，经比对发现，拉帕岛标本与Morgan所记述的该类群存在显著差异，实为一新种；本文对其进行了完整的形态绘图与详细描述，并将其命名为Calcinus shawi sp. nov.（肖氏细螯寄居蟹，新种）。本文还将该新种的形态与体色，与其近缘物种C. sirius（西里斯细螯寄居蟹）以及1989年Morgan发表的Calcinus dapsiles（达普利斯细螯寄居蟹）进行了对比分析。