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Tubularida :: Tubularida (n. pl.) An extensive division of Hydroidea; the tubularians; -- called also Athecata, Gymnoblastea, and Tubulariae..

Sporosac :: Sporosac (n.) A hydrozoan reproductive zooid or gonophore which does not become medusoid in form or structure. See Illust. under Athecata.

Gymnotoka :: Gymnotoka (n. pl.) The Athecata.

Blastostyle :: Blastostyle (n.) In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See Hydroidea, and Athecata..

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

Gymnoblastea :: Gymnoblastea (n. pl.) The Athecata; -- so called because the medusoid buds are not inclosed in a capsule.

Gonophore :: Gonophore (n.) A sexual zooid produced as a medusoid bud upon a hydroid, sometimes becoming a free hydromedusa, sometimes remaining attached. See Hydroidea, and Illusts. of Athecata, Campanularian, and Gonosome..

Athecata :: Athecata (n. pl.) A division of Hydroidea in which the zooids are naked, or not inclosed in a capsule. See Tubularian..

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