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Sawtooth Pen Shell
Stiff Pen Shell
A live Pen Shell in the Genus Atrina. Either A. rigida or A. seminuda. Not sure if it is possible to distinguish for sure without seeing the interior surface.
The Pterioida are a suborder of large and medium-sized saltwater clams, marine bivalve mollusks. It includes five families, among them the Pteriidae (pearl oysters and winged oysters).