• Devonian of Algeria (1 collection), Australia (1), Belgium (3), Brazil (1), Canada (6: Northwest Territories, Nunavut), the Czech Republic (8), France (1), Germany (5), Italy (3), Kazakhstan (1), Morocco (8), the Russian Federation (7), Thailand (1)

• Silurian of the United Kingdom (2)

• Volkhov of the Russian Federation (16)

• Ordovician of Canada (1: Nunavut), the Czech Republic (2), Estonia (2), Ireland (1), the Russian Federation (2), Sweden (4), the United Kingdom (4)

Total: 80 collections each including a single occurrence