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Boonea cincta
''Boonea cincta'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. The species is one of eleven known species within the Boonea genus of gastropods. 〔Rosenberg, G. (2011). ''Boonea cincta'' (Carpenter, 1864). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=397025 on 2011-10-26〕〔ITIS database〕〔Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.〕
==Description==
The elongate-ovate shell is vitreous. Its length measures approximately 3 millimetres. The whorls of the protoconch are smooth, deeply immersed in the first of the succeeding turns, above which only the tilted edge of the last volution projects. The five whorls of the teleoconch are well rounded. They are marked by vertical axial ribs which are strongest near the summit, becoming much enfeebled as they pass to the suture. Of these ribs 18 occur upon the second and third and 20 upon the fourth whorl. In addition to the ribs the whorls are marked by four broad, strong, spiral keels which form nodules at their junction with the ribs. On the body whorl the axial sculpture is obsolete on the anterior half between the sutures. The sutures are subchanneled. The periphery of the body whorl is marked by a strong keel. The base of the shell is well rounded posteriorly, effuse
anteriorly. It is marked by six low, spiral cords, the two nearest the umbilical area being very faint. The oval aperture is decidedly effuse anteriorly. The posterior angle is acute. The thin outer lip is rendered sinuous by the spiral cords. It shows the external sculpture within. The columella is slender, very long, almost straight, reflected, reinforced by the base. It is provided with a weak fold at its insertion. 〔 ( William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909 ) (described as ''Odostomia (Chrysallida) cincta'')〕
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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