• Permian of Japan (1 collection), New Zealand (1), United States (59: Arizona, Kansas, Montana, New Mexico, Texas, Wyoming)

• Carboniferous of Argentina (1), Australia (9), Poland (1), the Russian Federation (1), the United Kingdom (1), United States (91: Illinois, Indiana, Kansas, Kentucky, Missouri, Nevada, New Mexico, Ohio, Oklahoma, Texas, Utah, Wyoming)

Total: 165 collections including 186 occurrences