Runnegar, Bruce.Newell, Norman Dennis, 1909-2005-10-062005-10-061974http://hdl.handle.net/2246/546019 p. : ill. ; 24 cm.Includes bibliographical references (p. 17-19)."Edmondia, nominate genus of the family Edmondiidae and the superfamily Edmondiacea, has a deeply furrowed hinge plate on each valve. The furrow contains a row of small suspensory muscle insertions, previously interpreted as a ligament groove. Carboniferous and Permian genera Scaldia, Allorisma, and Cardiomorpha have broadly similar hinges and are grouped with Edmondia in the Edmondiidae. The presence of the hinge furrow distinguishes the Edmondiidae from otherwise similar representatives of the families Grammysiidae and Megadesmidae. All three families are here referred to the superfamily Pholadomyacea, and Edmondiacea is dropped"--P. [1].4828915 bytesapplication/pdfen-USQL1 .A436 no.2533, 1974Edmondiidae.Pholadomyoida, Fossil.Bivalvia, Fossil.Mollusks, Fossil.Paleontology -- Paleozoic.text