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Description of Suctoria

Phyllopharyngeid ciliates, mature sessile trophonts are usually not ciliated, with 1 to many tentacles that ingest prey; extrusomes (haptocysts) at tentacle tips; tentacles supported by an outer ring of microtubules and an inner set of microtubular ribbons (= phyllae); ciliated, migratory dispersal larvae or swarmers (formed, usually, by unequal cell division) typically bearing neither tentacles nor stalk; somatic monokinetids, each with slightly to moderately convergent postciliary ribbon, short laterally-directed kinetodesmal fibril, and transverse fiber; parasomal sacs on either side of kinetosome; nematodesmatal ribbon arising from somatic kinetosomes, extending posteriorly beneath kinety; many species, as trophonts, ectosymbiotic on other organisms.

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