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An advanced larva in the life cycle of certain hydrozoans that possesses a mouth and tentacles, and may attach and develop into a new hydroid colony (as in Tubularia or hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems) or metamorphose into a medusa (tentacled, usually bell-shaped, free-swimming jellyfish).
This entry is located in the following unit: actino-, actin-, actini-, -actinal, actis- + (page 6)