• Carboniferous of United States (4: Arizona, California, Montana collections)

• Givetian of United States (1: Missouri)

• Devonian of Australia (7), Belgium (5), Canada (32: British Columbia, Northwest Territories, Nunavut, Ontario, Quebec, Yukon, Yukon Territory), China (4), the Czech Republic (7), France (8), Germany (1), Poland (5), the Russian Federation (5), United States (242: Alaska, Arizona, Colorado, Indiana, Iowa, Maine, Maryland, Michigan, Missouri, Montana, Nevada, New Mexico, New York, Ohio, Pennsylvania, West Virginia, Wisconsin)

• Silurian of Canada (5: Yukon, Yukon Territory), China (7), the Czech Republic (3), United States (1: Nevada)

Total: 337 collections including 364 occurrences