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The Tonnidae are a family of medium-sized to very large sea snails, known as the tun shells. These are marine gastropod molluscs in the clade Littorinimorpha. The name "tun" refers to the snails' shell shape which resembles wine casks known as "tuns". While the shells are thin, they are also strong. There is no operculum. They are found in all tropical seas, where they inhabit sandy areas. During the day, they bury themselves in the substrate, emerging at night to feed on echinoderms (especially sea cucumbers), crustaceans, and bivalves. Some larger species also capture fish, using their expandable probosces to swallow them whole. Females lay rows of eggs that become free-swimming larvae for several months before settling to the bottom.〔Rehder, Harold A., 1981, National Audubon Society Field Guide to Shells, pg. 503〕 == Taxonomy == In 2005, these subfamilies were recognized in the taxonomy of Bouchet & Rocroi: *Cassinae Latreille, 1825 *Oocorythinae P. Fischer, 1885 *Phaliinae Beu, 1981 *Tonninae Suter, 1913 Bouchet & Rocroi (2005) listed Cassidae as a synonym of Tonnidae Suter, 1913 (1825), following Riedel (1995) in this. However, later Beu (2008: 272) separated the two families.〔Beu A. G. (2008). "Recent deep-water Cassidae of the world. A revision of ''Galeodea'', ''Oocorys'', ''Sconsia'', ''Echinophoria'' and related taxa, with new genera and species (Mollusca, Gastropoda)". In: Héros V., Cowie R. H. & Bouchet P. (eds). "Tropical Deep-Sea Benthos 25". ''Mémoires du Muséum National d'Histoire Naturelle'' 196: 269-387. (abstract in French ).〕 This is in agreement with the action of Thiele (1925) who placed Tonnidae and Cassidae under "Tonnacea", therefore acting as first reviser under ICZN article 24. In this respect, the World Register of Marine Species follows the opinion of Beu. 〔 Gofas, S. (2011). Cassidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=22999 on 2011-02-23 〕 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「Tonnidae」の詳細全文を読む スポンサード リンク
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