Sister taxa: none
Subtaxa: Batrachoides Eozoon Eozoon canadense Horodyskia Horodyskia moniliformis Isuasphaera Isuasphaera isua Micropalaeosoma Micropalaeosoma balticus Neoguadalupia oregonensis Thelyphonus hadleyi Tineites crystalli Tragos binneyi Velia cornuta Vermiforma Verruca withersi
Distribution:
• Quaternary of the Russian Federation (1 collection), United States (1: Oregon)
• Miocene of United States (1: California)
• Eocene of the Russian Federation (1)
• Cretaceous of Colombia (1)
• Jurassic of Germany (1), United States (2: Massachusetts)
• Permian of the United Kingdom (1)
• Ediacaran of China (2), United States (3: North Carolina)
• Calymmian of United States (3: Montana)
• Paleoarchean of Australia (1)
• Eoarchean of Greenland (2)
Total: 20 collections including 28 occurrences