PDF File - The Indian Society for Parasitology

84Manjula and JanardananMiracidiumFreshly laid eggs hatched in 2-3 h. Miracidiapyriform, with conical papilla at anterior end;posterior end round; measured 132-176 x 46-73 (151 x64). Cilia long, uniformly distributed. Eyespots two,oval and conjoined; 19-23 x 8-13 (20 x 11.5) in size. Alarge apical gland and a pair of lateral penetrationglands present. A pair of flame cells present behindthe eyespots. Miracidia swim actively in water,changing direction intermittently. They exhibitednegative phototaxis.ratio, extent of uterine coils which lead extra-caecallyup to caecal bifurcation, nature of testes and seminalvesicle and the shape and size of eggs. A comparisonof the characters of C. smythi and of C.neilgherriensis, presented in Table I, showed that thetwo species were different from each other. Further,they infect different hosts too. Therefore, the flukereported herein has been considered as a new speciesand named Chelatrema neilgherriensis after thespecific name of the type host, Danio neilgherriensis.ACKNOWLEDGEMENTSDISCUSSION The authors express their sincere thanks to Dr. D. I.Gibson, Department of Zoology, The Natural HistoryIn the present study, the fluke is characterised by theMuseum, London, for taxonomic identification of thepresence of large ventral sucker, well-developedfluke to generic level, and to the Head of thepharynx, short oesophagus, symmetrical testes, pre-Department of Zoology, University of Calicut, fortesticular ovary, single compact vitellarium, stronglyproviding facilities.convoluted uterus and embryonated eggs, and hence itis included in the genus Chelatrema Gupta andKumari, 1973. These authors included the genus under REFERENCESfamily Hemiuridae Luhe, 1901, but Gibson and BrayCantwell GE. 1981. Methods for invertebrates. In: staining(1979) treated it as a genus inquirendum and Gibson inprocedures. Clark G (Ed.) Williams and Wilkins, Baltimore.2002 considered it a gorgoderid. As the characters ofpp 255-280.the genus Chelatrema agree fully with that ofGorgoderidae, we agree with the arrangement made Gibson DI. 2002. Family Derogenidae Nicoll, 1910. In: Keys tothe Trematoda. Volume 1. Gibson DI, Jones A & Bray RAby Gibson and place the genus under the family(Eds.) CAB International. pp 351-368.Gorgoderidae.Gibson DI and Bray RA. 1979. The Hemiuroidea: terminology,The new species reported here needed to be compared systematics and evolution. Bull. Br. Nat. Hist. (Zool.). 36:with the only species in the genus, C. smythi which 35-146.infects the freshwater fish Chela bacala. It resembledGupta N K and Kumari A. 1973. Chelatrema smythi n. gen. n.C. smythi in the extent of caeca, position of gonads, sp. (Trematoda, Hemiuidae: Arnolinae) from a fresh-waternature and position of vitellarium and position of fish, Chela bacala, from Ropar. Res. Bull. (N.S.) of thegenital pore. But it differed greatly in body Panjab Univ. 24:109-112.measurements, size of oral and ventral suckers, sucker