Abstract

During a parasitological survey in China, two species of trichodinid ectoparasite (Ciliophora, Peritrichida, Trichodinidae) belonging to genus Paratrichodina, were isolated from letalurus punetaus (Siluridae). One species was identified as a new species and named as Paratrichodina rotundiformis sp. nov. and this new species has round and undeveloped blade with round tangent point, undeveloped triangular central part, slim ray with inclining backward, and whole fitting loose denticle. The other species, Paratrichodina corlissi is described for the first time in Asia in the present work. The morphometric data were obtained from specimens prepared using dry silver nitrate and methyl green-pyronin stain techniques. Results of comparison between the new species and closely related species are provided.

Key words: Ciliophora, oligohymenophorea, Peritrichida, Paratrichodina, new species,Ietalurus punetaus.