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Pyramidella acus
・ Pyramidella adamsi
・ Pyramidella auricoma
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・ Pyramidella camara
・ Pyramidella conica
・ Pyramidella corrugata
・ Pyramidella dolabrata
・ Pyramidella elenensis
・ Pyramidella gracilis
・ Pyramidella hancocki
・ Pyramidella hastata
・ Pyramidella inopinata


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Pyramidella acus : ウィキペディア英語版
Pyramidella acus

''Pyramidella acus'', common name the needle pyram, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2010). ''Pyramidella acus'' (Gmelin, 1791). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=208425 on 2012-01-12〕〔Drivas, J. & M. Jay (1988). Coquillages de La Réunion et de l'île Maurice〕〔Dautzenberg, P. (1923). Liste preliminaire des mollusques marins de Madagascar et description de deux especes nouvelles. Journal de Conchyliologie 68: 21-74.〕
==Description==

The shell is polished. Its color is white, with dark chestnut or chocolate spots, usually arranged in three revolving series on the whorls of the teleoconch and five series on the body whorl. The columella is three-plaited with the upper plait largest. The lip is sometimes lirate within. The peripheral groove becomes in this species either obsolete or indicated by a slight angle. 〔 (G.W. Tryon, Manual of Conchology vol. VIII p. 301; 1889 ) 〕 The length of the shell varies between 19 mm and 67 mm.

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