A taxonomic class or group name for jawless fish with circular mouths, including lampreys and hagfish; an older Latin plural form.
Latin plural of cyclostomum, using the Latin '-i' ending for masculine nouns, reflecting older scientific naming conventions used in medieval and early modern biology.
You'll find 'Cyclostomi' in older biology textbooks as a formal class name, representing a time when scientists used full Latin grammatical rules—it's been largely replaced by modern English plurals.
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