• Carboniferous to Permian of United States (1: New Mexico collection)

• Carboniferous of Canada (1: Nova Scotia), United States (6: New Mexico)

• Devonian of Bolivia (1), Brazil (3), Canada (2: Northwest Territories, Nunavut), the Czech Republic (2), Poland (8), the Russian Federation (3), the United Kingdom (2)

• Silurian of Canada (2: Nova Scotia, Nunavut), China (2), Poland (2), the United Kingdom (2), United States (5: Indiana, Michigan, New York)

• Ordovician of United States (1: New York)

Total: 43 collections each including a single occurrence