†superorder Eognathostomata Smith 1984 (sea urchin)
Echinoidea - Perischoechinoidea
Parent taxon: Perischoechinoidea according to H. Hagdorn 2018
Sister taxa: Bothriocidaroida, Echinocystitoida, Lanternarius, Lepidocentridae
Subtaxa: Palaechinoidea
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Permian of Greece (1 collection), United States (1: Texas)
• Carboniferous of the United Kingdom (1), United States (1: Indiana)
• Silurian of Sweden (1)
Total: 5 collections each including a single occurrence