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・ Turbonilla santamariana
・ Turbonilla santarosana
・ Turbonilla santosana
・ Turbonilla scala
・ Turbonilla scalaeformis
・ Turbonilla scalpidens
・ Turbonilla scammonensis
・ Turbonilla scapulata
・ Turbonilla scarabinoi
・ Turbonilla schlumbergeri
・ Turbonilla nereia
・ Turbonilla nesiotes
・ Turbonilla newcombei
・ Turbonilla nicaraguana
・ Turbonilla nicarasana
Turbonilla nicholsi
・ Turbonilla nicoyana
・ Turbonilla nihilfere
・ Turbonilla nivea
・ Turbonilla nodoscalare
・ Turbonilla nodulyrata
・ Turbonilla nofronii
・ Turbonilla nonica
・ Turbonilla nuttalli
・ Turbonilla nuttingi
・ Turbonilla nychia
・ Turbonilla oaxacana
・ Turbonilla obeliscus
・ Turbonilla obesa
・ Turbonilla obliquata


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Turbonilla nicholsi : ウィキペディア英語版
Turbonilla nicholsi

''Turbonilla nicholsi'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Turbonilla nicholsi'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576076 on 2012-04-21〕〔Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:〕
This species was named after Lieutenant Nichols who collected the type specimen.
==Description==
The milk-white shell is large and robust. Its length (protoconch missing) measures 8.8 mm. The whorls of the protoconch are decollated in the type specimen. The twelve whorls of the teleoconch are well rounded and slightly shouldered at the summit. They are marked by strong, somewhat sinuous, decidedly protractive axial ribs, of which 14 occur upon the first, 16 upon the second to sixth, 18 upon the seventh, 20 upon the eighth, 22 upon the ninth, and 25
upon the penultimate turn. The intercostal spaces are almost as wide as the ribs. They are well impressed, and terminate a little distance posterior to the suture. The sutures are strongly marked. The periphery and the rather long base of the body whorl are well rounded. They are marked by the feeble continuations of the axial ribs. The entire surface of the base and the spire are marked by numerous, strongly incised spiral striations, of which those on the spire somewhat exceed the ones on the base in strength. The oval aperture is large. The outer lip is thin, showing the external sculpture within. The columella is slender, sigmoid, and slightly reflected. 〔 (Dall & Bartsch (1909), A monograph of West American pyramidellid mollusks, United States National Museum, bulletin 68, p. 46-47 (described as ''Turbonilla (Strioturbonilla) nicholsi'') ) 〕

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