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cyclostome

cyclostome (sī'klustōm") [key], jawless fish, member of the Cyclostomata, the only living order of the vertebrate class Agnatha (see Chordata). This group includes the hagfish and the lamprey. The name also applies to members of the order Cyclostomata of the invertebrate phylum Ectoprocta, class Gymnolaemata.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on cyclostome from Infoplease:

cyclostome: meaning and definitions - cyclostome: Definition and Pronunciation
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