单词	cyclostome
释义	cyclostome /ˈsʌɪklə(ʊ)stəʊm / noun Zoology An eel-like jawless vertebrate with a round sucking mouth, of a former group that included the lampreys and hagfishes. Subclass Cyclostomata, now incorporated in the superclass Agnatha. Data concerning key evolutionary invertebrate and vertebrate groups, the protochordates, chondrichthyes and cyclostomes, are essential to establish evolutionary patterns of the peptides.... The skeleton of cyclostomes furnishes far fewer taxonomic characters than that of the more complex cheilostomes. This extant species has erect jointed colonies, an articulated growth-form which seemingly evolved convergently with that of crisiid cyclostomes. Origin Mid 19th century: from cyclo- + Greek stoma 'mouth'.
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