Folia Parasitologica 45[4] 283-294 (1998)

Helminth parasites of the rare endemic catfish, Liobagrus reini, in Japan

Moravec, Nagasawa: Helminthsof Liobagrus František Moravec1,2, Kazuya Nagasawa2
1 Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
2 National Research Institute of Far East Fisheries, Fisheries Agency of Japan, 5-7-1 Orido, Shimizu, Shizuoka 424 - 8633, Japan

Examinations of 29 specimens of the catfish Liobagrus reini Hilgendorf (Siluriformes: Amblycipitidae), a species endemic to Japan, collected from the Sho River, Toyama Prefecture, in central Honshu, revealed the presence of four species of helminth parasites: Plagioporus honshuensis sp. n. (Trematoda), Rhabdochona coronacauda Belouss, 1965, R. japonica Moravec, 1975 and Mexiconema liobagri sp. n. (all Nematoda). The new opecoelid trematode P. honshuensis is characterized mainly by the extent of vitelline follicles, the size ratio of the suckers (1 : 1.7-2.1), the situation of testes near the middle of the body and by the structure, size and shape of the cirrus sac. Allopodocotyle Pritchard, 1966 is considered a junior synonym of Plagioporus Stafford, 1904. The males of R. japonica are described for the first time and conspecific females are redescribed; this species is a specific parasite of L. reini. The principle hosts of R. coronacauda are cyprinids and, therefore, its finding in the catfish may indicate an accidental infection; L. reini represents a new host record. M. liobagri (only females were found) from the host's abdominal cavity is the second known species of this dracunculoid genus, being characterized by the position of the excretory pore and the number (1) of caudal processes in the female. The recorded helminths are briefly described and illustrated and problems of their systematic status are discussed.

Keywords: Liobagrus reini, freshwater fish, helminths, Plagioporus, Rhabdochona, Mexiconema, Honshu, Japan

Received: December 19, 1997; Accepted: March 3, 1998; Published: December 1, 1998  Show citation

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Moravec,, Liobagrus František Moravec, N.H., & Nagasawa, K. (1998). Helminth parasites of the rare endemic catfish, Liobagrus reini, in Japan. Folia Parasitologica, 45(4), 283-294
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