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Mesotheca :: Mesotheca (n.) The middle layer of the gonophore in the Hydrozoa.

Gonophore :: Gonophore (n.) A lengthened receptacle, bearing the stamens and carpels in a conspicuous manner..

Planoblast :: Planoblast (n.) Any free-swimming gonophore of a hydroid; a hydroid medusa.

Sessile :: Sessile (a.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached.

Gonozooid :: Gonozooid (n.) A sexual zooid, or medusoid bud of a hydroid; a gonophore. See Hydroidea, and Illust. of Campanularian..

Perigone :: Perigone (n.) A sac which surrounds the generative bodies in the gonophore of a hydroid.

Tubularia :: Tubularia (n.) A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles..

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

Gymnophthalmata :: Gymnophthalmata (n. pl.) A group of acalephs, including the naked-eyed medusae; the hydromedusae. Most of them are known to be the free-swimming progeny (gonophores) of hydroids..

Meconidium :: Meconidium (n.) A kind of gonophore produced by hydroids of the genus Gonothyraea. It has tentacles, and otherwise resembles a free medusa, but remains attached by a pedicel..

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..

Gynophore :: Gynophore (n.) One of the branches bearing the female gonophores, in certain Siphonophora..

Thecophora :: Thecophora (n. pl.) A division of hydroids comprising those which have the hydranths in thecae and the gonophores in capsules. The campanularians and sertularians are examples. Called also Thecata. See Illust. under Hydroidea.

Gonoblastid :: Gonoblastid (n.) A reproductive bud of a hydroid; a simple gonophore.

Medusoid :: Medusoid (a.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of hydroids..

Isogonism :: Isogonism (n.) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

Gonotheca :: Gonotheca (n.) A capsule developed on certain hydroids (Thecaphora), inclosing the blastostyle upon which the medusoid buds or gonophores are developed; -- called also gonangium, and teleophore. See Hydroidea, and Illust. of Campanularian..

Medusoid :: Medusoid (n.) A sessile gonophore. See Illust. under Gonosome.

Androphore :: Androphore (n.) The part which in some Siphonophora bears the male gonophores.

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