Bivalvia - Trigoniida - Trigonodidae

Parent taxon: Trigonodidae according to H. E. Vokes 1980

Sister taxa: Anodontophora, Cardinioides, Janaija

Subtaxa: Unionites albertii, Unionites borealis, Unionites breviformis, Unionites brevis, Unionites canalensis, Unionites donacinus, Unionites elisabethae, Unionites fassaensis, Unionites gregarius, Unionites griesbachi, Unionites guizhouensis, Unionites letticus, Unionites manmuensis, Unionites minimus, Unionites ovalis, Unionites posterus, Unionites rhomboidalis, Unionites sorokovi, Unionites spicatus, Unionites subrectus, Unionites trapezoidalis

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Ecology: facultatively mobile infaunal suspension feeder