Zoanthus is a genus of anthozoans in the family Zoanthidae. The polyps resemble those of closely related anthozoans, such as sea anemones and corals. They include polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, crustaceans. Palythoa is a genus of anthozoans in the order Zoantharia. There are two primary strategies of symbiodinium uptake by anthozoans. Most anthozoans are unisexual but some stony corals are hermaphrodite. Some anthozoans can also reproduce asexually through budding or by breaking in pieces. Medusozoans differ from anthozoans in having a medusa stage in their life cycle. Anthozoans are carnivores, catching prey with their tentacles. Most anthozoans are opportunistic predators, catching prey which drifts within reach of their tentacles. The species "Pavona duerdeni" belong the Anthozoans, characterized by being marine invertebrates. In the case of "Aiptasia", and all anthozoans, the body form is the polyp.