Peltaspermopsida - Peltaspermales - Umkomasiaceae
Parent taxon: Peltaspermales according to S. V. Meyen 1984
Sister taxa: Autuniaceae, Cardiolepidaceae, Leuthardtiaceae, Matatiellaceae, Peltaspermaceae, Permotheca, Pseudocallipteris, Syniopteris, Vetlugospermaceae, Xenopteris
Subtaxa: Harrisiothecium Nidia Nidistrobus Pachypteris Pteroma Ptilozamites Rhaphidopteris Rhexoxylon
Distribution:
• Cretaceous of Argentina (2 collections), India (10)
• Jurassic to Cretaceous of Antarctica (1), Australia (1), France (1), India (2)
• Jurassic of Antarctica (3), Argentina (2), Australia (3), China (1), Colombia (1), France (9), Georgia (8), Greenland (7), India (18), Iran (1), Italy (1), Japan (1), Lithuania (1), Norway (1), Poland (1), Romania (14), the Russian Federation (9), Serbia and Montenegro (1), Tajikistan (2), the United Kingdom (44), Uzbekistan (1)
• Triassic to Jurassic of Germany (1), Mexico (1), Sweden (2)
• Triassic of Australia (3), Austria (1), Brazil (1), China (32), Germany (2), Greenland (13), India (1), Iran (1), Italy (5), Japan (2), Kyrgyzstan (1), Lesotho (1), the Russian Federation (1), Sweden (3), Switzerland (1), Tajikistan (1), Ukraine (4)
• Permian of India (1), the Russian Federation (7)
Total: 231 collections including 298 occurrences