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''Ovula ovum'', common name the common egg cowrie, is a species of sea snail, a marine gastropod mollusk in the family Ovulidae, the ovulids, cowry allies or false cowries. ==Description== The shells of these quite common cowries reach on average of length, with a minimum size of and a maximum size of . They are egg-shaped (hence the Latin name ''ovum'', meaning egg). The surface of the shell is smooth, shiny and completely snow white, with a dark reddish-purple interior, visible through the wide and long aperture, which bears teeth on one side only. In the living cowries the mantle is black, with a pattern of small white spots in adults, while juveniles resemble some toxic nudibranchs of the genus ''Phyllidia'' owing to their orange yellow sensorial papillae. The lateral flaps of the mantle usually hide completely the white surface, but the mantle is quickly retracted into the shell opening when the cowry is disturbed. File:Ovula ovum Taiwan.jpg|''Ovula ovum'' with whole body covered by its mantle. This species can be easily found in the nearshore water of northeast coast of Taiwan. File:Ovula ovum.jpg|Juvenile ''Ovula ovum'' with orange yellow papillae looks like a toxic nudibranch ''Phyllidia'' sp. File:Ovula_ovum_01.JPG|A shell of ''Ovula ovum'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ovula ovum」の詳細全文を読む スポンサード リンク
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