Stenolaemata
Distribution:
• Triassic of Greenland (2 collections), New Caledonia (1)
• Permian of Australia (1), China (3), Iran (4), Mexico (2), New Zealand (1), the Russian Federation (1), Tunisia (1), United States (29: Arizona, Nevada, Utah)
• Carboniferous of Spain (1)
• Devonian of United States (1: New York)
• Ordovician of Canada (4: Ontario, Quebec), the United Kingdom (5), United States (101: Virginia, Wisconsin, Wyoming)
• Arenig of United States (1: Nevada)
Total: 158 collections including 166 occurrences