Bivalvia - Unionida

Alternative spelling: Unionacea

Parent taxon: Unionidina according to J. G. Carter et al. 2011

Sister taxon: Mullerioidea

Subtaxa: Actinodontophoridae, Margaritiferidae, Mutelidae, Sancticarolitidae, Unionidae

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Ecology: facultatively mobile infaunal suspension feeder