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Thoracica is a superorder of crustaceans which contains the most familiar species of barnacles found on rocky coasts, such as ''Semibalanus balanoides'' and ''Chthamalus stellatus''. They have six well-developed limbs, and may be either stalked or sessile. The carapace is heavily calcified. The group includes free-living and commensal species. ==Classification== This article follows Martin and Davis in placing Thoracica as a superorder of Cirripedia and in the following classification of thoracicans down to the level of families: Superorder Thoracica Darwin, 1854 * Order Pedunculata Lamarck, 1818 * * Suborder Heteralepadomorpha Newman, 1987 * * * Anelasmatidae Gruvel, 1905 * * * Heteralepadidae Nilsson-Cantell, 1921 * * * Koleolepadidae Hiro, 1933 * * * Malacolepadidae Hiro, 1937 * * * Microlepadidae Zevina, 1980 * * * Rhizolepadidae Zevina, 1980 * * Suborder Iblomorpha Newman, 1987 * * * Iblidae Leach, 1825 * * Suborder Lepadomorpha Pilsbry, 1916 * * * Lepadidae Darwin, 1852 * * * Oxynaspididae Gruvel, 1905 * * * Poecilasmatidae Annandale, 1909 * * Suborder Scalpellomorpha Newman, 1987 * * * Calanticidae Zevina, 1978 * * * Lithotryidae Gruvel, 1905 * * * Pollicipedidae Leach, 1817 * * * Scalpellidae Pilsbry, 1907 * Order Sessilia Lamarck, 1818 * * Suborder Brachylepadomorpha Withers, 1923 * * * Neobrachylepadidae Newman & Yamaguchi, 1995 * * Suborder Verrucomorpha Pilsbry, 1916 * * * Neoverrucidae Newman, 1989 * * * Verrucidae Darwin, 1854 * * Suborder Balanomorpha Pilsbry, 1916 * * * Superfamily Chionelasmatoidea Buckeridge, 1983 * * * * Chionelasmatidae Buckeridge, 1983 * * * Superfamily Pachylasmatoidea Utinomi, 1968 * * * * Pachylasmatidae Utinomi, 1968 * * * Superfamily Chthamaloidea Darwin, 1854 * * * * Catophragmidae Utinomi, 1968 * * * * Chthamalidae Darwin, 1854 * * * Superfamily Coronuloidea Leach, 1817 * * * * Chelonibiidae Pilsbry, 1916 * * * * Coronulidae Leach, 1817 * * * * Platylepadidae Newman & Ross, 1976 * * * Superfamily Tetraclitoidea Gruvel, 1903 * * * * Bathylasmatidae Newman & Ross, 1971 * * * * Tetraclitidae Gruvel, 1903 * * * Superfamily Balanoidea Leach, 1817 * * * * Archaeobalanidae Newman & Ross, 1976 * * * * Balanidae Leach, 1817 * * * * Pyrgomatidae Gray, 1825 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thoracica」の詳細全文を読む スポンサード リンク
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