Abstract

Three species of dactylogyrids were found on the gills of the European eel, Anguilla anguilla which were cultured in eel farm ponds in Japan. They were all classified into the genus Pseudodactylogyrus GUSSEV, 1965, and were identified as P. microrchis n. sp., P. anguillae and P. bini. P. microrchis closely resembles P. anguillae, but definitely differs in the size of the testis and the prostatic reservoir from that of P. anguillae, where these organs of the former are much smaller than those of the latter. In addition, the length of anchor, the bar and the cirrus accessory of P. microrchis are significantly shorter than the those of P. anguillae.

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