Bivalvia - Cardiida - Mactridae

Synonym: Schizothaerus Conrad 1853

Parent taxon: Lutrariinae according to R. T. Abbott 1974

Sister taxa: Heterocardia, Lutraria, Lutromactra, Meropesta

Subtaxa: Tresus capax, Tresus nuttallii, Tresus pajaroanus

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Ecology: facultatively mobile infaunal suspension feeder