Cyclostome is a biological term (from the Greek for "round mouth") used in two different senses:
for the extant members of the Agnatha, i.e. the hagfish (Myxini) and the lampreys (Petromyzontidae). This is a paraphyletic group and this usage of the term is deprecated by some. (However, there also is recent molecular evidence for cyclostome monophyly, and thus the term remains in use.)
for the Order Cyclostomatida of bryozoans, tiny animals that live in colonies and form large calcitic skeletons.
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