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semislug : ウィキペディア英語版
semislug

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)
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