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Description of Plagiopyla nasutaMeasurements; Length 80-180 um. Body about 100 (80-180 um) long. Dorso-ventrally flattened; uniform ciliation, sometimes yellowish or beige in color, oral groove transverse, cytostome on the left end; a so-called "striated structure" is present on the dorsal side starting from the edge of the mouth groove and turning backwards; trichocysts in large numbers all over the body; macronucleus near the right margin in the middle of the body; P. nasuta exhibits great morphological variability. (ref. ID; 1219) Ovoid; tapering anteriorly; peristome at right angles or slightly oblique to the edge; trichocysts at right angles to body surface; macronucleus round to irregular in shape; sapropelic in brackish water.