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hydroidea : 英英辞書
Hydroi"dea
n. pl.[NL. See Hydra, and -oid.] (Zol.) An extensive order of Hydrozoa or Acaleph. [Written also Hydroida.]
This order includes the hydras and the free-swimming hydromedus, together with a great variety of marine attached hydroids, many of which grow up into large, elegantly branched forms, consisting of a vast number of zooids (hydranths, gonophores, etc.), united by hollow stems. All the zooids of a colony are produced from one primary zooid, by successive buddings. The Siphonophora have also been included in this order by some writers. See Gymnoblastea, Hydromedusa, Gonosome, Gonotheca.



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