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Boonea impressa : ウィキペディア英語版 | Boonea impressa
''Boonea impressa'', common name the impressed odostome, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. The species is one of twelve known species within the Boonea genus of gastropods. 〔Bouchet, P. (2011). ''Boonea impressa'' (Say, 1822). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=420437 on 2011-10-26〕〔Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas.〕 The preferred host of this ectoparasite is the eastern oyster ''Crassostrea virginica'' 〔 ( Robert Robertson and Terry Mau-Lastovicka, The Eectoparasitism of Boonea and Fargoa (Gastropoda: Pyramidellidae); Biol Bull157: 320-333. (October 1979) ) 〕 ==Description== The thick shell is opaque The shell grows to a length of 6.7 mm. The teleoconch contains seven flat whorls with a deep suture. The body whorl has 15 revolving lines, the upper ones more distant, about four lines on the next whorl, the number of lines diminishing on the upper whorls. The columellar tooth is distinct. 〔 (G.W. Tryon, Manual of Conchology vol. VIII p. 356; 1886 (described as ''Odostomia bisuturalis'') ) 〕
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