Flabesymbios commensalis is a species of marine worm that lives in sea urchin spikes. According to recent research, F. commensalis has a two-color body and lives on urchins in the genus Strongylocentrotus.Read, G.; Fauchald, K. (Ed.) (2025). World Polychaeta Database. Flabesymbios commensalis (Moore, 1909). https://www.marinespecies.org/aphia.php?p=taxdetails&id=986733 on 2025-03-10 It has been found along the Pacific coast of North America.
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