Observations on trichodinid ectoparasites (Ciliophora: Peritricha) from the gills of maricultured molluscs in China, with descriptions of three new species of Trichodina Ehrenberg, 1838.
During surveys of the trichodinid parasites in mariculture beds off the coast of Shandong Province, China, 4 species of the genus Trichodina from the gills of marine molluscs were investigated and morphologically studied. Of these, 3 are described as new: T. ruditapicis sp. nov. from Ruditapes philippinarum (Veneridae), T. scapharcae sp. nov. from Scapharca subcrenata (Arcidae) and T. mactrae sp. nov. from Mactra veneriformis (Mactridae). One little-known species, T. macomarum, is redescribed from M. veneriformis. Taxonomic and morphometric data for these trichodinids based on wet silver nitrate and protargol-impregnated specimens are presented. For each of the new species, comparisons with closely related species are provided.