 The relatively large encrusting sponge "Lissodendoryx colombiensis" is most common on rocky surfaces, but has extended its range into seagrass meadows by letting itself be surrounded or overgrown by seagrass sponges, which are distasteful to the local starfish and therefore protect "Lissodendoryx" against them; in return the seagrass sponges get higher positions away from the sea-floor sediment.Shrimps of the genus "Synalpheus" form colonies in sponges, and each shrimp species inhabits a different sponge species, making "Synalpheus" one of the most diverse crustacean genera.Specifically, Synalpheus regalis utilizes the sponge not only as a food source, but also as a defense against other shrimp and predators.