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Bradybaenidae is a taxonomic family of medium-sized to small land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. These snails are found mainly in Asia, with only one species occurring in Northwestern Europe: ''Fruticicola fruticum''. The name of the family and the genus ''Bradybaena'' is derived from the Greek words ''bradus'' (= slow) and ''baino'' (= walk), meaning "slow walker". Molecular phylogenetic studies from 2007 showed that bradybaenids are closely related with the Camaenidae, which are currently recognized as a distinct family. In these studies both Bradybaenidae and Camaenidae are mutually polyphyletic, together forming a monophyletic group, however. This finding suggests that the distinction of both families as based essentially on the absence (Camaenidae) or presence (Bardybaenidae) of a diverticulum, is arbitrary. This anatomical structure was apparently lost (or was gained) in several groups in convergence and is therefore not suitable for the delimitation of natural groups.〔Wade C. M., Hudelot C., Davison A., Naggs F., Mordan P. B. (2007). "Molecular phylogeny of the helicoid land snails (Pulmonata: Stylommatophora: Helicoidea), with special emphasis on the Camaenidae". ''Journal of Molluscan Studies'' 73(4): 411-415. .〕 As a result, the Bradybaenidae being the younger taxon are likely to represent a junior synonym of the Camaenidae. == Anatomy == Some genera of snails in this family create and use love darts as part of their mating behavior. The dart sac contains one to two glands. They are also defined by missing a diverticulum. In this family, the number of haploid chromosomes lies between 26 and 30 (according to the values in this table).〔Barker G. M.: Gastropods on Land: ''Phylogeny, Diversity and Adaptive Morphology''. in Barker G. M. (ed.): ''(The biology of terrestrial molluscs )''. CABI Publishing, Oxon, UK, 2001, ISBN 0-85199-318-4. 1-146, cited pages: 139 and 142.〕 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「Bradybaenidae」の詳細全文を読む スポンサード リンク
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