The sea anemones are members of the cnidarian Order Actiniaria. They attach to hard substrates including stones and shells.
Sea anemones are solitary animals but can form dense concentrations.
Metridium reproduces sexually, with gametes fertilized in the water column forming a planula larvae that settles on suitable substrate. Liponema brevicornis - A common red or orange anemone of the outer shelf in the SE Bering Sea. It is frequently detached from the substrate by the research trawl. Height to 10 cm.