†subfamily Psammosteinae Traquair 1896 (jawless fish)
Pteraspidomorpha - Pteraspidiformes - Psammosteidae
Parent taxon: Psammosteidae according to V. Glinskiy 2017
Sister taxa: Drepanaspis, Dyptychosteus, Ganosteus, Oredezhosteus, Placosteus, Psammosteus, Pycnosteus, Vladimirolepis
Subtaxa: Elgaia Traquairosteus
Ecology: planktonic suspension feeder
Distribution:
• Devonian of Canada (1: Nunavut collection), Estonia (1), Latvia (1), the Russian Federation (3), the United Kingdom (1)
Total: 7 collections including 9 occurrences