Abstract
Two nematode species, Pseudoproleptus notopteri (Karve et Naik, 1951) and Spinitectus notopteriKarve et Naik, 1951 (both Cystidicolidae), are redescribed based on light and scanning electron microscopical studies of specimens collected from the digestive tract of the freshwater fish Notopterus notopterus (Pallas) (Notopteridae, Osteoglossiformes) in Thailand. Some new important morphological features, such as a detailed structure of the cephalic end and the presence of bifurcate deirids and a ventral median caudal protuberance in male, are reported for the former species (P. notopteri), which is provisionally assigned to PseudoproleptusKhera, 1955; Notopteroides notopteriChakravarty et Majumdar, 1962, Pseudoproleptus satendriSahay, 1967, P. lamyiLe-Van-Hoa et Bui-Thi Lien-Huong, 1969, P. gomtiiGupta et Bakshi, 1984. P. sprentiGupta et Masoodi, 1986 and P. thapariGupta et Naiyer, 1992 are considered its junior synonyms. The first study of S. notopteri by SEM showed its morphological similarity with S. mastacembeliKarve et Naik, 1951, from which it clearly differs by the structure of eggs; Spinitectus alii Kalyankar, 1970, S. bengalensisChakravarty, Sain et Majumdar, 1961, S. gomalensis Siddiqui et Kattak, 1984 and S. thapari Ali, 1957 are considered to be junior synonyms of S. notopteri. Pseudoproleptus notopteri and Spinitectus notopteri are reported from Thailand for the first time.
Acknowledgements
We thank the Department of Fisheries, Faculty of Agriculture and Technology, Nakhon Phanom University and Aquatic Animal Biotechnology Research Center, Department of Fishery and Coastal Resources, Faculty of Science and Industrial Technology, Prince of Songkla University, for providing necessary facilities. The authors’ thanks are also due to the staff of the Laboratory of Electron Microscopy, Institute of Parasitology, Biology Centre of the CAS, České Budějovice, for their technical assistance, and to Blanka Škoríková of the same Institute for help with the illustrations. This study was partly supported by the Czech Science Foundation (Grant. No. P505/12G112) and by institutional support (RVO:60077344, Institute of Parasitology, BC CAS).
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