Bivalvia - Unionida

Parent taxon: Unionoida according to J. J. Sepkoski 2002

Sister taxa: Actinodontophora, Actinodontophoroidea, Archanodontacea, Carydioidea, Cycloconchoidea, Etherioidea, Hyriidina, Nakamuranaia, Pachycardiidae, Protelliptio, Silesunionidina, Undulatula, Unionidina, Zhifangia

Subtaxa: Pachycardia dianensis

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Ecology: facultatively mobile infaunal suspension feeder