• Permian of Australia (24 collections), Austria (2), Bolivia (22), Canada (2: British Columbia, Nunavut), China (27), Indonesia (12), Iran (3), Japan (4), Malaysia (2), Mexico (5), Oman (2), Pakistan (24), Peru (4), Slovenia (1), Svalbard and Jan Mayen (2), United States (60: Alaska, Arizona, California, Kansas, New Mexico, Texas, Wyoming), Vietnam (1)

• Carboniferous to Permian of Bolivia (1), Laos (1), Svalbard and Jan Mayen (1), United States (1: California)

• Carboniferous of Australia (3), Belize (1), Bolivia (7), Canada (21: Alberta, Northwest Territories, Nova Scotia, Nunavut, Yukon), China (3), Egypt (2), India (2), Ireland (2), Libya (2), Mexico (1), Svalbard and Jan Mayen (3), the United Kingdom (50), United States (141: Alaska, Arizona, California, Colorado, Idaho, Illinois, Indiana, Iowa, Kansas, Michigan, Missouri, Montana, Nevada, New Mexico, Ohio, Oklahoma, Pennsylvania, Texas, Utah, Virginia)

• Devonian of United States (9: Montana)

Total: 448 collections including 543 occurrences