Fragile Pink Sea Urchin

Fragile Pink Sea Urchin (Strongylocentrotus fragilis)

Pom-pom anemone, pink sea urchin, and brittle stars on the seafloor at the Oregon Offshore site (600m depth). Credit: UW/NSF-OOI/WHOI, Dive J2-1170, V19

Commonly seen at the Oregon Offshore and Slope Base sites, S. fragilis is a regular sea urchin (meaning it is roughly spherical with a ventral mouth and an anus on the dorsal surface). This species is slightly flattened, and usually has a pale pink coloration and short, thin white spines. They are distributed across the continental shelf and slope off the west coast of North America, generally in waters below 200 meters.