Ectogrammysia Hoare et al. 1989 (clam)

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

See also Sepkoski 2002

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

Subtaxa: Ectogrammysia crassatis Ectogrammysia hannibalensis Ectogrammysia inaffecta Ectogrammysia prolata

View classification

Type: Ectogrammysia crassatis

Ecology: facultatively mobile infaunal suspension feeder


• Chesterian of United States (2: West Virginia collections)

• Carboniferous of Mexico (5), United States (5: Arkansas, Iowa, West Virginia)

• Devonian of Canada (1: Alberta), United States (2: Missouri)

Total: 15 collections including 17 occurrences

Show more details

Specimen images are retrieved through the ePANDDA API.

Click image to enlarge. Click to access iDigBio record.