A NEW SPECIES OF MONOGENETIC TREMATODE OF FRESHWATER FISHES FROM QIANTANG RIVER,ZHEJIANG PROVINCE

Ancyrocephalus zhejiangensis, sp. nov. (figs. 1--3) Body large, 1.038--1.736×0.324--0.574mm; opisthohaptor 0.016--0.166×0.116--0.183 mm. Marginal hooklets 0.016--0.023 mm in length. Ventral central large anchors0.049--0.052 mm in total length, basal portion 0.034--0.040 mm, outer root 0.009--0.018 mm, inner root 0.016--0.018 mm, point 0.009--0.014 mm. Ventral connectiveplate as united by three plates, 0.056--0.063×0.012--0.016 mm. Dorsal central largeanchors 0.045--0.049 mm in total 1ength, basal portion 0.020--0.027 mm, outer root0.007--0.012 mm, inner root 0.022--0.025 mm, point 0.005--0.009 mm. Dorsal connec-tive plate 0.007--0.011×0.043--0.063. Copulatory tube 0.027--0.031 mm in length, 0.011--0.016 mm in diameter of basalpart, 0.002--0.003 mm in diameter of tube. Supporting apparatus 0.025--0.026mm.in length. Egg with operculum, 0.100--0.108×0.065--0.075 mm. Vagina not been dis-covered. Host and location: gill of Plagiognathops microlepis and Xenocypris davidi. Locality: Qiantang River. The new species differs from A. perplexus and other congeners in the shape andsize of all the chitinous structures.