Plumose anemone Metridium senile Scientific classification Kingdom: Animalia Phylum: Cnidaria Class: Anthozoa Order: Actiniaria Family: Metridiidae Genus: Metridium
de Blainville, 1824 
Species See text
Members of the genus Metridium, also known as plumose anemones, are sea anemones found mostly in the cooler waters of the northern Pacific and Atlantic oceans. They are characterized by their numerous threadlike tentacles extending from atop a smooth cylindrical column, and can vary from a few centimeters in height up to one meter or more. In larger specimens, the oral disk becomes densely curved and frilly.
The following species are recognised in the World Register of Marine Species (WoRMS): 
- Metridium canum Stuckey, 1914
- Metridium dianthus
- Metridium exilis Hand, 1956
- Metridium farcimen (Tilesius, 1809)
- Metridium huanghaiensis Pei, 1998
- Metridium parvulum McMurrich, 1904
- Metridium senile (Linnaeus, 1761)
In popular culture
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