The living morphology, infraciliature and silverline system of a poorly known marine cyrtophorous ciliate Dysteria pusilla (Claparède et Lachmann, 1859), isolated from a fish-culturing tank off Qingdao, China, have been investigated. An improved diagnosis for Dysteria pusilla is supplied: small marine Dysteria, body rectangular in outline when viewed from side, 15-30 x 10-20 μm in vivo; with one right ventral and 2 frontoventral kineties in right field; 7 short fragments of kineties in left equatorial field; oral structure simplified; three contractile vacuoles, two ventrally located, and one positioned dorso-frontally; macronucleus sausage-like.
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