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Figure 4

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Morphological photomicrographs of the dry silver-impregnated Trichodina unionis from snail Physella acuta (A and B) and snail Gyraulus siamensis (C). (A) Complete-turned ciliature on the oral side (arrow), (B and C) circular arrangement of the denticles within the adhesive disc on the aboral side (arrows point to the bend angle on the blade margin of the denticle). Scale bars: 20 μm.

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