Other mollusks include gastropods, scaphopods and bivalves. Mollusks are mostly represented by gastropods and bivalves. Invertebrates like brachiopods, gastropods, and molluscs were severely affected. Marine fossils found in Port Talbot region include species of bivalves, gastropods and brachiopods. The limestone contains marine fossils including crinoids, brachiopods, gastropods, horn corals, and bryozoans. The estimate of 85,000 molluscs includes 24,000 described species of terrestrial gastropods. The Solsville member contains well preserved bivalves, gastropods, and brachiopods. These include corals, stromatoporoids, algae, brachiopods, gastropods and straight nautiloids. Nacre is found in some of the most ancient lineages of bivalves, gastropods, and cephalopods. These classes include gastropods, bivalves and cephalopods, as well as other lesser-known but distinctive classes. The most diverse groups are the prosobranch gastropods and amphipod crustaceans. Middle Eocene invertebrates of California included corals, gastropods, and pelecypods. Pests include viruses, bacteria, and fungi as well as arthropods and gastropods. The chemosensory organs of opisthobranch marine gastropods are called rhinophores. Sexual cannibalism is present largely in spiders and other invertebrates, including gastropods.