Reaching only about 14 mm (about 0.6 mm) in diameter, Psilaxis krebsii (Mörch, 1875), is one of the smallest species in the sundial family Architectonicidae. The Smooth Sundial has an amphi-Atlantic distribution, living in moderately deep water from Florida to Colombia in the western Atlantic, and the Mediterranean Sea, Canary Islands, and off West Africa. (A large reproduction of this illustration is displayed in the In Focus exhibition at the National Shell Museum.)
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