Metridioidea

{{Short description|Superfamily of sea anemones}}

{{Automatic taxobox

| image = Sea Loch Anemone.jpg

| image_alt = "Protanthea simplex", Sound of Mull, Scotland

| image_caption = Protanthea simplex, Sound of Mull, Scotland

| taxon = Metridioidea

| authority= Carlgren, 1893

| subdivision_ranks= Families

| subdivision= See text

}}

Metridioidea is a superfamily of sea anemones in the order Actiniaria. Members of this clade live in shallow subtropical waters worldwide.{{Cite journal |last1=Grajales |first1=Alejandro |last2=Rodríguez |first2=Estefanía |date=2016-01-01 |title=Elucidating the evolutionary relationships of the Aiptasiidae, a widespread cnidarian–dinoflagellate model system (Cnidaria: Anthozoa: Actiniaria: Metridioidea) |url=https://www.sciencedirect.com/science/article/pii/S1055790315002626 |journal=Molecular Phylogenetics and Evolution |volume=94 |issue=Pt A |pages=252–263 |doi=10.1016/j.ympev.2015.09.004 |pmid=26375331 |bibcode=2016MolPE..94..252G |issn=1055-7903|url-access=subscription }}