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Cerodrillia thea : ウィキペディア英語版 | Cerodrillia thea
''Cerodrillia thea'' is a species of sea snail, a marine gastropod mollusk in the family Drilliidae. ==Description== The shell size varies between 13 mm and 19 mm. The shell is ashy olivaceous, covered with a shiny very thin epidermis, and is claret-brown within the aperture.. There are eight whorls with eleven short, oblique, slightly curved ribs, more prominent on the periphery and fading away above it. The shell shows an evanescent spiral strife, not always visible, and some stronger raised threads towards the base. 〔 George Washington Tryon, Manual of Conchology vol. VI, p. 189; 1884 (described as ''Drillia thea'') 〕
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