• Miocene to Oligocene of United States (1: Montana collection)

• Miocene to Pliocene of France (1), Germany (1)

• Miocene of Germany (4), Japan (1), Poland (2), the Russian Federation (3), United States (1: Montana)

• Oligocene to Miocene of United States (2: Montana)

• Oligocene of the Russian Federation (2), United States (2: Oregon, Virginia)

• Eocene of China (1), United States (7: Alaska, Colorado, Idaho, Virginia)

• Clarkforkian of United States (3: Wyoming)

• Paleocene of United States (55: Colorado, Montana, New Mexico, North Dakota, South Dakota, Wyoming)

Total: 86 collections each including a single occurrence