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・ Pyramidal number
・ Pyramidal peak
・ Pyramidal process of palatine bone
・ Pyramidal tracts
・ Pyramidalis
・ Pyramidalis muscle
・ Pyramidcampa
・ Pyramide
・ Pyramidella
・ Pyramidella achates
・ Pyramidella acus
・ Pyramidella adamsi
・ Pyramidella auricoma
・ Pyramidella ava
・ Pyramidella bairdi
Pyramidella bicolor
・ Pyramidella camara
・ Pyramidella conica
・ Pyramidella corrugata
・ Pyramidella dolabrata
・ Pyramidella elenensis
・ Pyramidella gracilis
・ Pyramidella hancocki
・ Pyramidella hastata
・ Pyramidella inopinata
・ Pyramidella linearum
・ Pyramidella maculosa
・ Pyramidella magdalenensis
・ Pyramidella mazatlanica
・ Pyramidella mexicana


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

''Pyramidella bicolor'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Pyramidella bicolor'' Menke, 1854. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575937 on 2012-01-12〕〔Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064〕
==Description==
The shining shell has an elongate-conic shape. The early whorls are white, the succeeding ones gradually acquiring a pinkish tinge, which deepens and finally tints the last whorl rose-purple. The length of the shell varies between 8 mm and 10 mm. (The whorls of the protoconch are decollated). The eight whorls of the teleoconch are overhanging, flattened, slightly shouldered and minutely crenulated, and deeply sulcate at the periphery. The sutures are strongly impressed. The base of the shell is short, moderately rounded, and with a weak fasciole at the insertion of the columella. The outer lip of the type specimen was badly fractured.The columella is conic, and moderately strong. It is provided with a strong lamellar fold at its insertion, a moderately strong median one and a weaker anterior to it; the last two much more oblique than the posterior. 〔(Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 21-22: 1909 ) 〕

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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