Pododesmus rudis (Broderip, 1834) (family Anomiidae) is very similar to the Common Jingle, Anomia simplex, but can be easily separated from this latter by the rougher-looking valves, with coarser shell surface and the almost complete lack of nacre, the iridescent shell layer known as mother-of-pearl. Common and Atlantic False Jingles and other species in the family Anomiidae attach to hard surfaces (such as large, empty shells) using a peg-like byssus. The byssus passes through the bottom valve through an orifice (photo).
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The Atlantic False Jingle, Pododesmus rudis, from Sanibel, about 40 mm long (1.5 inch). Photos by José H. Leal.