Scuba dive off Point Loma, December 9, 2012
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Crassispira semiinflata snails

cup corals on encrusting blue sponge

cup corals, sea slug Doriopsilla albopunctata with yellow sponge

scallop Crassadoma giganteus

sea slug Flabellina iodinea

Macrocystis kelp holdfast, sheltering brittle stars Ophiothrix spiculata, who wave their arms out to feed. If unsheltered, these brittle stars would get eaten, so the intricate rooting structure of a kelp holdfast is a safe haven.