naked-eyed medusae

2 definitions found

naked-eyed medusae - Collaborative International Dictionary of English v.0.48 :

  Hydromedusa \Hy`dro*me*du"sa\, n.; pl. Hydromedus[ae]. [NL.
     See Hydra, and Medusa.] (Zool.)
     Any medusa or jellyfish which is produced by budding from a
     hydroid. They are called also Craspedota, and naked-eyed medus[ae]
     .
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     Note: Such medus[ae] are the reproductive zooids or
           gonophores, either male or female, of the hydroid from
           which they arise, whether they become free or remain
           attached to the hydroid colony. They in turn produce
           the eggs from which the hydroids are developed. The
           name is also applied to other similar medus[ae] which
           are not known to bud from a hydroid colony, and even to
           some which are known to develop directly from the eggs,
           but which in structure agree essentially with those
           produced from hydroids. See Hydroidea, and
           Gymnoblastea.
           [1913 Webster]

  Medusa \Me*du"sa\, n. [L., fr. Gr. ?.]
     1. (Class. Myth.) The Gorgon; or one of the Gorgons whose
        hair was changed into serpents, after which all who looked
        upon her were turned into stone.
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     2. [pl. Medusae.] (Zool.) Any free swimming acaleph; a
        jellyfish.
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     Note: The larger medusae belong to the Discophora, and are
           sometimes called covered-eyed medusae; others, known
           as naked-eyed medusae, belong to the Hydroidea, and
           are usually developed by budding from hydroids. See
           Discophora, Hydroidea, and Hydromedusa.
           [1913 Webster]
  
     Medusa bud (Zool.), one of the buds of a hydroid, destined
        to develop into a gonophore or medusa. See Athecata, and
        Gonotheca.
  
     Medusa's head.
        (a) (Zool.) An astrophyton.
        (b) (Astron.) A cluster of stars in the constellation
            Perseus. It contains the bright star Algol.
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