• Quaternary of United States (2: California collections)

• Pliocene to Pleistocene of United States (2: California)

• Cretaceous of Germany (2), Portugal (14)

• Triassic of United States (2: Nevada)

• Carboniferous of United States (5: Indiana, Kansas, Pennsylvania)

• Devonian of Antarctica (3), Australia (1), Canada (8: Alberta, Nunavut), the Czech Republic (1), the Russian Federation (3), Spain (2), United States (1: Ohio)

• Silurian of Spain (1), United States (1: Wisconsin)

• Arenig of United States (1: Nevada)

Total: 49 collections each including a single occurrence