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Viviparus glacialis
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Viviparus glacialis : ウィキペディア英語版
Viviparus glacialis

†''Viviparus glacialis'' is an extinct species of fossil freshwater snail, an aquatic gastropod mollusks in the family Viviparidae, the river snails.
==Shell description==
This species of snail had an elongated, slim, rather thick-walled shell with approximately 6 ¼ flat whorls which are separated by a shallow suture. The apex is blunt. The aperture is slantingly oval and weakly angulated at the top. The peristome is simple, not thickened and not continuous. There is a narrow umbilicus that may be covered with callus. The surface of the shell is smooth and glossy and bears regular growing lines. Under a magnification of c. 50× a sculpture of fine spiral grooves can be observed. These 'grooves' are composed of densely spaced tiny holes. In most cases the periostracum has not been preserved but if still present this has a light brown to black color. Whether or not the shell had a color pattern, and if so what that might have been is unknown.
The width of the shell is up to 13.5 mm, the height is up to 24 mm.

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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