Abstract
Isopod parasites of the subfamilies Ioninae and Pseudioninae infest the branchial chambers of brachyuran crabs. In total, 19 species of parasitic isopods infest crabs from China; they belong to 6 genera from the Ioninae and 1 genus from the Pseudioninae. Specifically, the following genera are represented: Allokepon Markham, 1982 (three species), Apocepon Nierstrasz and Brender à Brandis, 1930 (three species), Cancricepon Giard and Bonnier, 1887 (one species), Dactylokepon Stebbing, 1910 (four species), Gigantione Kossmann, 1881 (four species), Onkokepon, An et al. 2006 (two species) and Tylokepon Stebbing, 1906 (two species). The new species Tylokepon biturus from Menaethius monoceros (Latreille) collected in China is distinguished from other members of the genus by the striking shape of the head, two mid-dorsal projections on Pereomere 6, and entire pleopods and uropods without any tubercules on their surface. A list of all bopyrid species (19 species in seven families) along with their hosts and localities, is presented.
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