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Stylommatophora is a taxon of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This taxon is considered to be a clade. It used to be regarded as an infraorder (also sometimes was considered to be an order). This taxon includes the majority of land snails and slugs. The two strong synapomorphies of Stylommatophora are a long pedal gland placed beneath a membrane and two pairs of retractile tentacles (Dayrat & Tillier). Several families in this group contain species of snails and slugs that create love darts. Stylommatophora are known from the Cretaceous to the Recent periods.〔 Pek I., Vašíček Z., Roček Z., Hajn. V. & Mikuláš R. (1996). ''Základy zoopaleontologie''. Olomouc, 264 pp., ISBN 80-7067-599-3.〕 == 2005 taxonomy == According to the taxonomy of the Gastropoda by Bouchet & Rocroi (2005) based on evolutionary ancestry is the clade Stylommatophora in clade Eupulmonata within informal group Pulmonata. It uses unranked clades for taxa above the rank of superfamily (replacing the ranks suborder, order, superorder and subclass) and the traditional Linnaean approach for all taxa below the rank of superfamily. The clade Stylommatophora contains the subclades Elasmognatha, Orthurethra and the informal group Sigmurethra. The term "informal group" has been used to indicate whenever monophyly has not been tested, or where a traditional taxon of gastropods has now been discovered to be paraphyletic or polyphyletic. clade Elasmognatha * Superfamily Succineoidea * Superfamily Athoracophoroidea clade Orthurethra * Superfamily Partuloidea * Superfamily Achatinelloidea * Superfamily Cochlicopoidea * Superfamily Pupilloidea * Superfamily Enoidea informal group Sigmurethra * Superfamily Clausilioidea * Superfamily Orthalicoidea * Superfamily Achatinoidea * Superfamily Aillyoidea * Superfamily Testacelloidea * Superfamily Papillodermatoidea * Superfamily Streptaxoidea * Superfamily Rhytidoidea * Superfamily Acavoidea * Superfamily Punctoidea * Superfamily Sagdoidea "limacoid clade" (within the Sigmurethra) * Superfamily Staffordioidea * Superfamily Dyakioidea * Superfamily Gastrodontoidea * Superfamily Parmacelloidea * Superfamily Zonitoidea * Superfamily Helicarionoidea * Superfamily Limacoidea (not in limacoid clade, but is within the Sigmurethra) * Superfamily Arionoidea * Superfamily Helicoidea 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「stylommatophora」の詳細全文を読む スポンサード リンク
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