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Gibbula gaudiosa
''Gibbula gaudiosa'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔( Museum of Comparative Zoology - Harvard University: ''Gibbula gaudiosa'' )〕
==Description==
The height of the shell attains 5.6 mm, its diameter 5.7 mm. The moderately elevated shell has a helicoid shape. It is red, with four regularly spaced triangular sectors of greenish yellow, on the last turn and one on the whorl preceding this. The cords of the early turns are of the most intense red, equaling the base in the brilliancy of this color. The 1½ nuclear whorls arewhite. The four postnuclear whorls are well rounded, the first and second marked by four equal, and equally spaced, strong, spiral keels. On the third, a fine, intercalated thread occurs between the strong cords, while on the last turn the number of fine spiral threads between the strong cords is doubled. In addition to the above sculpture, the spire is marked by rather strong, closely spaced, retractive incremental lines. The sutures are strongly impressed. The periphery of the body whorl is rendered strongly angulated by the fourth strong spiral cord. The base of the shell is short, well rounded, and marked by 15 almost equal and equally spaced, well-rounded, spiral cords. The oblique aperture is subcircular. The outer lip is thin at the edge where it is rendered sinuous by the strong spiral cords. The columella is moderately stout and well curved. The parietal wall is covered with a thin callus.〔(P. Bartsch (1915), Report on the Turton collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum; Bulletin of the United States National Museum v. 91 (1915) )〕
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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