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Semi-slugs, also spelled semislugs, are land gastropods whose shells are too small for them to retract into, but the shell is not quite vestigial.〔 The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the mantle. This is a type of gastropod that is intermediate between a slug (without an external shell) and a land snail (with a large enough shell to retract completely into). There exist a number of gastropod families that have semi-slugs species.〔Breure A. S. H. (2010). "The rediscovery of a semi-slug: ''Coloniconcha prima'' Pilsbry, 1933 (Gastropoda, Pleurodontidae) from Hispaniola". ''Basteria'' 74(4-6): 78-86.〕 There exist about 1000 species of semi-slugs in comparison to about only 500 species of slugs.〔Burton D. W. (1982). "How to be sluggish". ''Tuatara'' 25(2): 48-63. (HTM ).〕 == Examples == Semi-slugs from the Neotropics: * family Amphibulimidae: ''Amphibulima'' and ''Gaeotis''〔 * family Xanthonychidae: ''Cryptostrakon'', ''Semiconchula'' and ''Xanthonyx''〔 * family Pleurodontidae: ''Coloniconcha prima''〔 * Semi-slugs do exist but are exceptional in the Camaenidae.〔 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「Semi-slug」の詳細全文を読む スポンサード リンク
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