Cnidaria Hatschek, 1888 - cnidarians Class Anthozoa Ehrenberg, 1831 Order Actiniaria - sea anemones Family Metridiidae Carlgren, 1893 Genus Metridium Blainville, 1824 1 Metridium senile (C. Linnaeus, 1761) McMurrich, 1911 - plumose anemone