Specimens of Gryphaea mutabilis and Exogyra costata etched in dilute hydrochloric acid develop complex patterns on the interior of their valves. These patterns, named "fingerprint shell structure" by Stenzel, were previously known from only one species of oyster, the extant Alectryonella plicatula (Gmelin). This shell structure seems related to flow patterns of water pumped through the oyster's internal cavity.--Modified journal abstract.

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