Abstract UVR-absorbing mycosporine-like amino acids (MAAs) were detected in tissues of Strongylocentrotus purpuratus and in ten species of Rhodophyte macroalgae (eight previously untested) collected from intertidal microhabitats in November and January 2006–2007 in Central California (35090N, 120450W). In sea urchins, MAA concentrations were higher in ovaries than testes, while epiderm…