Semicassis pyrum

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唐冠螺科
唐冠螺科
1890 Xenogalea Iredale, 1927: synonym of Semicassis Mörch, 1852 Xenophalium Iredale, 1927: synonym of Semicassis Mörch, 1852 Casmaria erinaceus Cassis cornuta
殼口
殼口
Semicassis pyrum(英语:Semicassis pyrum)的螺殼, which has a large aperture and a pronounced parietal callus(英语:parietal callus)