The discovery is reported of a species of apostome cihate, CoLluua beringensis, n. sp., Living endoparasitically in the haemocoel cavity of the Bering Sea euphausiid Thysanoessa inermis. This ciliate bears a falciform field and rosette structure in the protomite 2 stage and has a y (but not the full X, y, z) kinetid arrangement. Trophont, tomont, protomite 1 and tomitogenesis stages were also observed. The tomont, trophont and protomite 1 stages are characterized by an astomatous condition, and a denuded field was observed in the tomont and protomite 1 stages.
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Capriulo et al. (1985) studied this question.
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