Cyclostomi

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the GNU version of the Collaborative International Dictionary of English
  • noun-plural. A glass of fishes having a suckerlike mouth, without jaws, as the lamprey; the Marsipobranchii.
  • The Century Dictionary and Cyclopedia
  • In Cuvier's system of classification, the second family of his second order, Chondropterygii branchiis fixis, with the mouth formed into a sucker, containing the lampreys and hags, or the cyclostomous, monorhine, or marsipobranchiate fishes: a synonym of Marsipobranchii.
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