†Cryptochasma Casey 1961 (clam)
Bivalvia - Arcida - Parallelodontidae
Parent taxon: Grammatodontinae according to H. E. Vokes 1980
Sister taxa: Aptolinter, Catella, Catellini, Cucullopsis, Gilbertwhitea, Grammatodon, Grammatodontini, Nanonavis, Nemodon, Nemodontini, Nordenskjoeldia, Notogrammatodon, Porterius, Pseudogrammatodon, Pseudomacrodon, Stenocolpus, Torinosucatella
Subtaxa: none
Ecology: facultatively mobile low-level epifaunal suspension feeder