Bivalvia - Cardiidia - Grammysiidae
Alternative spellings: Prothyris (Prothyris), Solen (Prothyris)
Full reference: F. B. Meek. 1871. A preliminary list of fossils collected by Dr. Hayden in Colorado, New Mexico, and California, with brief descriptions of a few of the new species. Proceedings of the American Philosophical Society 11:425-431
Parent taxon: Grammysiidae according to R. D. Hoare et al. 1989
Sister taxa: Asketomorpha, Cardiomorpha, Cercomyopsis, Cimitaria, Cuneamya, Cuneamyinae, Ectogrammysia, Fuchsella, Glossites, Grammysia, Grammysiinae, Grammysioidea, Sedgwickia, Solenomorpha
Subtaxa: Prothyris (Amphikoilum), Prothyris (Lophoprothyris), Prothyris (Prothyris) acuticarinata, Prothyris (Prothyris) cilindricus, Prothyris soleniformis
Ecology: facultatively mobile infaunal suspension feeder