†subfamily Ptychodesmatinae Scarlato and Starobogatov 1984 (clam)
Bivalvia - Cyrtodontida - Cyrtodontidae
Alternative spelling: Ptychodesmatidae
Parent taxon: Cyrtodontidae according to J. G. Carter et al. 2011
See also Bouchet et al. 2010
Sister taxa: Cyrtodonta, Cyrtodontinae, Cyrtodontula, Daliella, Dickinsartella, Heikea, Macrodesma, Matheria, Ortonella, Pharcidoconcha, Sowteria, Thorslundia, Vanuxemia, Vigorniella, Warburgia, Yonginella
Subtaxa: Ptychodesma
Ecology: facultatively mobile semi-infaunal suspension feeder
Distribution:
• Devonian of Brazil (1 collection), Ghana (1), United States (4: New York, Pennsylvannia)
Total: 6 collections each including a single occurrence