Cyclostomata
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- This article is about the class of jawless fish. For the ancient order of stenolaemate bryozoans, see Cyclostomatida.
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Cyclostomata is a subclass of Agnatha. It is a group of jawless fish, including the lampreys and hagfishes.
Jawless fish do not have a jaw, of course, but they have rows of teeth that move in a circular motion; hence the name cyclostomata. Their mouths cannot close due to the lack of a jaw, so they constantly cycle water through the mouth.
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