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A study of hinge transposition in the bivalve families Carditidae, Condylocardiidae, Crassatellidae, Astar-tidae, Trapezidae, Cardiidae, Tellinidae, and Veneri-dae, all in the subclass Heterodonta showed that all these families except Condylocardiidae, Cardudae, Tellinidae and Venendae rarely have transposed hinges.
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Akihiko Matsukuma (1996) studied this question.
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