†subfamily Quadrithyridinae Gourvennec 1994 (lamp shell)
Rhynchonellata - Spiriferida - Xenomartiniidae
Parent taxon: Xenomartiniidae according to A. Williams et al. 2006
Sister taxa: Bojothyridinae, Xenomartiniinae
Subtaxa: Quadrithyris
Type: Quadrithyris
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Australia (4 collections), Austria (2), Canada (1: Nunavut), China (2), the Czech Republic (5), Germany (1), Italy (2), Morocco (2), the Russian Federation (2), United States (8: Nevada)
• Silurian to Devonian of Australia (1)
• Silurian of Estonia (2), Kazakhstan (1)
Total: 33 collections including 49 occurrences