Bivalvia - Cardiidia - Grammysiidae

Full reference: R. D. Hoare, M. J., I.I.I. Heaney, and R. H. Mapes. 1989. Bivalves (Mollusca) from the Imo Formation (Mississippian, Chesterian) of North-Central Arkansas. Journal of Paleontology 63(5):582-603

Parent taxon: Grammysiidae according to R. D. Hoare et al. 1989

Sister taxa: Asketomorpha, Cardiomorpha, Cercomyopsis, Cimitaria, Cuneamya, Cuneamyinae, Fuchsella, Glossites, Grammysia, Grammysiinae, Grammysioidea, Prothyris, Sedgwickia, Solenomorpha

Subtaxa: Ectogrammysia crassatis, Ectogrammysia hannibalensis, Ectogrammysia inaffecta, Ectogrammysia prolata

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Type: Ectogrammysia crassatis

Ecology: facultatively mobile infaunal suspension feeder