Abstract
Ichthyoxenusfushanensis, new species, a flesh-burrowing parasite of Varicorhinus barbatulus, collected from a mountain stream in northern Taiwan, is described. It resembles the only congeneric species, I. formosanus, recorded in Taiwan, but can be distinguished from the latter by the narrower forehead, smooth posterior margin of pereionites, narrower pleotelson, shorter antennae 1 and 2, and short carpus of pereiopod 1. The two species also differ in the structure of the mouthparts, especially the number of terminal spines on the mandible and maxilliped. In addition, the two species occur in different habitats and on different hosts. Ichthyoxenus formosanus is found in the body cavity of the fresh-water carp, Carassius auratus, occurring in lakes or ponds. The morphological differences between free-living mancas and parasitic adults of Ichthyoxenus fushanensis are compared. An undescribed cymothoid isopod of the genus Ichthyoxenus Herklots, 1870, was recently recovered from the fresh-water fish, Varicorhinus barbatulus (Pellegrin, 1908), in a mountain stream at Fushan Village, Wulai, Taipei County, in northern Taiwan. Ichthyoxenus is a genus of parasitic isopods that live on a variety of fresh-water and marine fishes. The distribution patterns and habitats of the
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