Bivalvia - Cardiida - Mactridae

Parent taxon: Mactrinae according to W. P. Woodring 1982

Sister taxa: Aliomactra, Allomactra, Andrusella, Avimactra, Crepispisula, Cryptomactra, Cymbophora, Diaphoromactra, Eopapyrina, Geltena, Harvella, Labiosa, Mactra, Mactrellona, Mactrinula, Mactrodesma, Nannomactra, Notospisula, Nymphactra, Ovamactra, Oxyperas, Priscomactra, Scalpomactra, Simomactra, Standella, Telemactra

Subtaxa: Trinitasia sanctiandreae

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Type: Thyasira sanctiandreae

Ecology: facultatively mobile infaunal suspension feeder