Below you’ll see a few examples of common intertidal sea anemones from the surf-swept rocky shores of the northern Oregon coast. These are just the ones I’ve come across and have photos of, not an exhaustive accounting. Most of these are common and easy to identify with the readily available field guides and online resources (see References, at the bottom of the page). Here, I just provide alternatives to the photos you’ll find in the field guides and online sources, and a few natural history notes if I can think of something that hasn’t already been said.
The organization more or less follows Lamb and Hanby (2005). Common names are my choice, usually some combination of those in Lamb and Hanby (2005), and Harbo (2011). I refer to WoRMS for scientific names, and I learn a ton by browsing the natural history riches in Kozloff (1993). All photos are from northern Oregon unless otherwise noted in the caption.
Short plumose anemone, Metridium dianthus– This is the one you see in the guides as Metridium senile. Under water, with it’s tentacles extended, it’s a beautiful anemone. I don’t too often on the exposed rocky shores of northern Oregon, but the ones below found conditions favorable on an overhanging rock wall.
Giant green anemone, Anthopleura xanthogrammica– This one gets my nod for best scientific name. With Pisaster ochraceus having been knocked back by sea star wasting syndrome since 2013, giant greens are the biggest, gaudiest tide pool creatures some people have ever seen. An intimate view of the oral disk can be seen here. Giant greens also feature prominently in Comparative Photos Show Rocky Intertidal Changes Between 2013 and 2016.
Pink-tipped green anemone, Anthopleura elegantissima – This one has a lot of common names. I usually go with aggregating anemone, or pink-tipped. Unless there has been an accident, you’ll never see a lone pink-tipped; they only occur in dense aggregations. It is said that clones war with each other and that you can find lines of separation between clones. Anthopleura elegnatissima is featured in Aggregating Anemones Handle the Sand and Anthopleura elegantissima Lives Up to All Its Common Names.
Moonglow anemone, Anthopleura artemisia – Also known are burrowing or buried anemone, I’ve got to go with moonglow. There are a couple well known colors; I show both below. You’ll almost always find moonglows where sand meets rock.
Harbo, R. M. 2011. Whelks to Whales: Coastal Marine Life of the Pacific Northwest. 2nd ed. Harbour Publishing Co.
Kozloff, E. N. 1993. Seashore Life of the Northern Pacific Coast. 3rd ed. University of Washington Press.
Lamb, A. and B. P. Hanby. 2005. Marine Life of the Pacific Northwest. Harbour Publishing.
Sept. J. D. 2009. The Beachcomber’s Guide to Seashore Life in the Pacific Northwest. Revised ed. Harbour Publishing.
Biodiversity of the Central Coast’s Cnidarians and Ctenophores page