n. In zoology: In Hydrozoa, a stage in the development of a discophoran, supervening upon the scyphistoma or hydra-tuba stage by the development of ephyræ, and before these become detached from one another and from the stalk upon which they grow. See ephyra, 1, and scyphistoma.n. In Vermes, a segmented tapeworm; the chain of zooids formed by a scolex and the proglottides which have successively budded from it.n. [capitalized] A supposed genus of acalephs, based on the strobiliform stage of certain hydrozoans.n. [capitalized] In entomology, a genus of lepidopterous insects.