ROCK SCALLOP (Crassedoma giganteum)
Habitat: Rocky intertidal zone and rocky reefs from British Columbia to Baja California
Size: 25 cm (10 in)
Position in food web: Filter feeder: Feeds on organic particles and plankton. Prey for predatory sea stars and humans.
Interesting facts:
Rock scallops, like many filter feeding mollusks, have a sophisticated sorting apparatus, which allows them to separate small inorganic particles from food particles and eject the inedible items from their bodies.
As a juvenile, this scallop is free swimming until it grows to about one inch where it settles on a rock, secreting a material that cements it to the substrate for the rest of its life.
Rock scallops have numerous blue, light-sensing eye spots that can detect motion
Relatives: clams, octopuses, and nudibranchs