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José H. Leal

Shell of the Week: The Beautiful Caecum

At 2.5 mm (about 0.1 inch), Caecum pulchellum Stimpson, 1851 is a local member of the family Caecidae, a group of marine microgastropods that have spiral juvenile shells that become cylindrical in the adult stage. The juvenile shells of caecums actually “fall” at the inception of adulthood. The Beautiful Caecum has a shell sculpture of about 20 “rings” that are half as wide as the interspaces separating them. The color is white or tan. The image was taken with a Scanning Electron Microscope.


The Beautiful Caecum, Caecum pulchellum, from Sanibel.

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