Rocky shores, rock jetties of Southern California, under rocks in mid to low tide horizon, low intertidal, sub intertidal, high intertidal. They eat algae, colonial tunicates and sponges by scraping rocks with their radula. Prey to Sea Stars, Sea Otters. Eggs and sperm released in the water. Sexually ripe individuals can be found any season of the year.
Limpets have separate sexes.
Some Limpets, such as the Rough Keyhole limpet, Diodora aspera, and the Giant Keyhole Limpet, Megathura crenulata, use slippery mantles to foil attacks by Sea Stars.