This is the right valve of a Palaeonucula variabilis pelecypod and came from a quarry near Segenthal, Germany where the rocks are middle Jurassic (Bajocian stage) in age.
Right valve
Left profile
Anterior
Right profile
My ID is based on the book "Sengenthal - Ein Eldorado für Fossiliensammler - Die Muscheln des Bajocium von Sengenthal" by Matthias Weissmueller from whom I also purchased this specimen via his E-bay store.
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