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Trichodina cancilae sp. n. (Mobilina: Trichodinidae) from the Gills of a Freshwater Gar, Xenentodon cancila (Hamilton) (Belonidae)

並列摘要


A population of a trichodinid ciliate (Mobilina: Trichodinidae) was found in the gills of the freshwater gar, Xenentodon cancila (Hamilton) (Belonidae) collected from Kalyani of Nadia District, West Bengal, India and was described as a new species. The specimens are characterized by the shape of denticles being elongated and arched blades; 1 or 2 cut-like notches in the convex side of the blade and the presence of the single non-staining granule at the base of blades and the base of rays; moderate central part; and broad and greatly arched rays. The body diameter ranged from 50.0-74.4 µm, whilst denticle number ranged from 28-32. Approximately 49.5% of the host fishes (213 out of 430) were infested with the ciliate on their gills during September 1995 and December 1997, sometimes in concurrent infestation with Tripartiella bursiformis (Davis, 1947) Lom, 1959. The highest percentage of infestation was recorded in December 1996 (73.3%). The variation is recorded and discussed.

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