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''Placostylus'', or flax snails, are a genus of very large, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Bothriembryontidae.〔 The shells of the snails in this genus can be as large as 4.5 inches (11 cm) in maximum dimension. Many species within this genus are now extinct. == Taxonomy == ''Placostylus'' is the type genus of the family Placostylidae.〔 It was placed within Placostylidae. Breure et al. (2010)〔Breure A. S. H., Groenenberg D. S. J. & Schilthuizen M. (2010). "New insights in the phylogenetic relations within the Orthalicoidea (Gastropoda, Stylommatophora) based on 28S sequence data". ''Basteria'' 74(1-3): 25-31.〕 moved ''Prestonella'' and ''Bothriembryon'' to Placostylidae. Subsequently Breure & Romero (2012)〔 confirmed previous results from 2010 and they renamed Placostylidae to Bothriembryontidae.〔Breure A. S. H. & Romero P. (2012). "Support and surprises: molecular phylogeny of the land snail superfamily Orthalicoidea using a three-locus gene analysis with a divergence time analysis and ancestral area reconstruction (Gastropoda: Stylommatophora)". ''Archiv für Molluskenkunde: International Journal of Malacology'' 141(1): 1-20. .〕 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「Placostylus」の詳細全文を読む スポンサード リンク
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