See text Diaphragmus is an extinct genus of brachiopod belonging to the order Productida and family Linoproductidae.

[1] Specimens have been found in Carboniferous beds in North America.

[2] Leighton & Maples (2002) conducted multiple phylogenetic analyses which are strongly in agreement that the four subfamilies Buxtoniinae, Echinoconchinae, Pustulinae and Juresaniinae form the family Echinoconchidae.

The results of their phylogenetic analyses are displayed in the cladogram below:[3] Productella Praewaagenoconcha Sentosia Leioproductus Spinocarinifera Diaphragmus Antiquatonia Flexaria Buxtonia Pustula Echinoconchus Echinaria Pulchratia Parajuresania

This brachiopod-related article is a stub.