Abstract
Two species of trichodinid ciliates were found on the gills of cultured tiger puffer, Takifugu rubripes; one was a new species, described as Trichodina fugu n.sp., and the other was identified as Trichodina jadranica (Raabe, 1958). This new species was discriminated from the known species by its slender blade of denticle in the adhesive disc. A scanning electron microscopy of T. fugu revealed an aboral ciliary complex consisting of sparsely arranged marginal cilia, a basal ciliary ring with short cilia, and strong locomotory wreath. Basal septum consisting of two layers was also observed between the locomotor ciliary wreath and the basal ciliary ring. The border membrane was narrow. Denticles and radial pins were also clearly observed by scanning electron microscopy.
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