†superfamily Protorthoidea Schuchert and Cooper 1931 (lamp shell)
Parent taxon: Protorthida according to A. Williams et al. 2000
Sister taxon: Skenidioidea
Subtaxa: Leioriidae Protorthidae
Ecology: stationary low-level epifaunal suspension feeder
Distribution:
• Arenig of Sweden (2 collections)
• Ordovician of Sweden (1)
• Solvan of the Czech Republic (1), Kazakhstan (1), Morocco (11)
• Delamaran of Canada (2: Alberta, British Columbia)
• Caerfai of Jordan (3)
• Cambrian of China (1), the Czech Republic (1), Israel (8), Kyrgyzstan (2), Morocco (4), United States (3: Arizona, Vermont)
Total: 40 collections including 54 occurrences