Abstract
Summary A new freshwater ciliate, Euplotes shanghaiensis nov. spec. isolated from a pond in Shanghai, China is described. Its morphology, infraciliature and silverline system were studied by light microscopy in vivo and following nigrosin staining, protargol and dry silver nitrate impregnation. E. shanghaiensis is a medium-sized species, body in vivo about 80–120×50–80 μm with 10 frontoventral, 5 transversal, 2 caudal and 2 left marginal cirri; ca. 54–58 membranelles in the adoral zone; 12–13 dorsal kineties, of which the middle one contains about 21–26 pairs of basal bodies. The new species differs from the other “double- eurystomus type dorsal argyrome” and “10-frontoventral-cirri” congeners with respect to the particular D-formed body shape, evenly curved adoral zone of membranelles, conspicuously large buccal field which is up to 4/5 of the both length and higher number of dorsal ciliary rows with densely packed kinetosomes.
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