Cyclostome

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title: "Cyclostome" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public topic_path: "uncategorized" source: "https://en.wikipedia.org/wiki/Cyclostome" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

Cyclostome is a biological term (from the Greek for "round mouth") used in a few different senses:

  • for the taxon Cyclostomi, which comprises the extant jawless fishes: the hagfish (Myxini) and the lampreys (Petromyzontidae). This was thought for a time to be a paraphyletic group and this usage of the term was deprecated by some. However, there is strong 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.
  • for one of two subgroups of braconid wasps.

References

References

  1. Stock, David. (7 August 1992). "Evidence from 18S ribosomal RNA sequences that lampreys and hagfishes form a natural group". Science.

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