• Permian of China (1 collection)

• Carboniferous of Australia (4), Bosnia and Herzegovina (1), Canada (2: Nunavut), the Czech Republic (1), Germany (2), Ireland (1), Libya (1), the United Kingdom (3), United States (41: Alaska, California, Idaho, Illinois, Iowa, Iowa/Illinois, Kentucky, Missouri, Nevada, Tennessee, Texas, Utah)

• Devonian to Carboniferous of the United Kingdom (1)

• Devonian of Afghanistan (9), Australia (2), Belgium (2), Canada (30: Alberta, Manitoba, Ontario), China (1), France (6), Germany (14), Libya (3), Morocco (1), Poland (5), the Russian Federation (1), Tajikistan (2), the United Kingdom (11), United States (83: Alaska, Colorado, Iowa, Maryland, Michigan, Montana, Nevada, New Mexico, New York, Ohio, Pennsylvania), Uzbekistan (1), Vietnam (1)

Total: 230 collections including 288 occurrences