• Carboniferous of Australia (16 collections), Canada (1: Alberta), China (4), Germany (3), Ireland (1), Libya (1), Mexico (2), the United Kingdom (9), United States (33: Illinois, Indiana, Missouri, Montana, Nevada, Texas)

• Givetian of United States (1: Missouri)

• Devonian of Afghanistan (1), Belgium (1), Canada (3: Alberta, Ontario), France (1), Germany (8), United States (297: Illinois, Iowa, Maryland, West Virginia, Virginia, Michigan, Missouri, Montana, New Mexico, New York, Pennsylvania, Virginia, West Virginia, Wisconsin), Venezuela (3)

Total: 385 collections including 398 occurrences