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A new species of suctorian protist epibiont of the mysid Schistomysis parkeri is described. The individuals show two types of adult form: elongated and flattened, both with 4-8 tentacular lobes. This new suctorian differs from described species of pro-Ophryodendron group by size, number of tentacular lobes, insertion of the tentacles, union of the lorica with the body, shape of the macronucleus, number of micronuclei and the lack of stalk (adult forms). The life cycle of this species is analysed and a succession pattern of its different stages is proposed.