†family Ptychodiscaceae Lemmermann 1899
Dinophyceae - Ptychodiscales - Ptychodiscaceae
Parent taxon: Ptychodiscales according to Fensome 1993
Sister taxa: none
Subtaxa: Alisogymnium Dinogymnium
Ecology: "photoautotroph"
Distribution:
• Paleocene of United States (1: Missouri collection)
• Cretaceous of Antarctica (3), Argentina (1), Canada (2: Manitoba, Northwest Territories), Chile (1), Colombia (1), United States (1: Texas)
Total: 10 collections including 13 occurrences