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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Acteonidae ： ウィキペディア英語版 Acteonidae Acteonidae, common name the "barrel bubble snails", is a family of small sea snails, marine gastropod mollusks of the informal group Lower Heterobranchia. 〔 Bouchet, P. (2012). Acteonidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=155 on 2012-08-04 〕 ==Shell description== The shell is usually smaller than 25 mm.〔 The shell of these sand-dwelling micromollusks is small, but it is large enough to house the retracted soft parts including the entire mantle. The aperture is elongated.〔 The narrow shell aperture, which is ovate and pointed on the top, can be closed with an operculum. The thick shell is oviform to fusiform, with a short (sometimes sunken) conical apex. They have spiral sculpturing. The elongated aperture opens up from narrow at the posterior notch to enlarged at the base. The base of the columella has several characteristic plaits. 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「Acteonidae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.