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Sea Fir :: Sea fir () A sertularian hydroid, especially Sertularia abietina, which branches like a miniature fir tree..

Plumularia :: Plumularia (n.) Any hydroid belonging to Plumularia and other genera of the family Plumularidae. They generally grow in plumelike forms.

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

Style :: Stylaster (n.) Any one of numerous species of delicate, usually pink, calcareous hydroid corals of the genus Stylaster..

Trophosome :: Trophosome (n.) The nutritive zooids of a hydroid, collectively, as distinguished from the gonosome, or reproductive zooids..

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..

Ramulus :: Ramulus (n.) A small branch, or branchlet, of corals, hydroids, and similar organisms..

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

Zooid :: Zooid (n.) One of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those individuals in which the mouth and digestive organs are not developed..

Hydrina :: Hydrina (n. pl.) The group of hydroids to which the fresh-water hydras belong.

Hydrocaulus :: Hydrocaulus (n.) The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea..

Nematocalyx :: Nematocalyx (n.) One of a peculiar kind of cups, or calicles, found upon hydroids of the family Plumularidae. They contain nematocysts. See Plumularia..

Trachymedusae :: Trachymedusae (n. pl.) A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusae..

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..

Hydroidea :: Hydroidea (n. pl.) An extensive order of Hydrozoa or Acalephae.

Hydrorhiza :: Hydrorhiza (n.) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea.

Hydrocorallia :: Hydrocorallia (n. pl.) A division of Hydroidea, including those genera that secrete a stony coral, as Millepora and Stylaster. Two forms of zooids in life project from small pores in the coral and resemble those of other hydroids. See Millepora..

Scyphistoma :: Scyphistoma (n.) The young attached larva of Discophora in the stage when it resembles a hydroid, or actinian..

Gemmipares :: Gemmipares (n. pl.) Animals which increase by budding, as hydroids..

Sertularian :: Sertularian (n.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively..

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