Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 116. Not illustrated. Chapters: Barnacle, Sacculina, Semibalanus Balanoides, Dosima, Pollicipes Pollicipes, Chthamalus Stellatus, List of Prehistoric Barnacles, Rhizocephala, Megabalanus, Thoracica, Balanus Nubilus, Goose Barnacle, Chthamalus Montagui, Balanus Aquila, Balanidae, Austromegabalanus Psittacus, Sessilia, Balanus Glandula, Acrothoracica, Armatobalanus, Sacculinidae, Peltogastridae, Archaeobalanidae, Chthamalidae, Acasta, Balanomorpha, Lernaeodiscidae, Whale Barnacle, Thompsoniidae, Elminius Modestus, Armatobalanus Nefrens, Thompsonia, Lepadidae, Pollicipedidae. Excerpt: AcrothoracicaThoracicaRhizocephala A barnacle is a type of arthropod belonging to infraclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive settings. They are sessile suspension feeders, and have two nektonic larval stages. Around 1,220 barnacle species are currently known. The name "Cirripedia" is Latin, meaning "curl-footed." Semibalanus balanoides feedingBarnacles are encrusters, attaching themselves permanently to a hard substrate. The most common, "acorn barnacles" (Sessilia) are sessile, growing their shells directly onto the substrate. The order Pedunculata ("goose barnacles" and others) attach themselves by means of a stalk. Most barnacles are suspension feeders; they dwell continually in their shell which is usually constructed of six plates and reach into the water column with modified legs. These feathery appendages beat rhythmically to draw plankton and detritus into the shell for consumption. Other members of the class have quite a different mode of life. For example, members of the genus Sacculina are parasitic, dwelling within crabs. Although they have been found at water depths up to 600 m (2,000 ft), ...