Fionoidea is a superfamily of small sea slugs, aeolid nudibranchs. They are gastropod mollusks within the infraorder Cladobranchia. The families within Fionoidea were shown to be monophyletic on DNA evidence and a re-interpretation of family characteristics was provided.

Fionoidea. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Fionoidea.