Rhynchonellata - Rhynchonellida - Petasmariidae
Parent taxon: Pugnacoidea according to A. Williams et al. 2002
Sister taxa: Aseptorhynchiidae, Basiliolidae, Camerophorinidae, Erymnariidae, Ladogiidae, Paranorellidae, Plectorhynchellidae, Pseudocapillirhynchia, Pugnacidae, Pygmaellidae, Rozmanariidae, Yunnanellidae
Subtaxa: Athabaschia Bryorhynchus Eurycolporhynchus Leiorhynchoidea Megalopterorhynchus Ovlatchania Parvaltissimarostrum Petasmaria Porostictia Pugnoides Rhynoleichus Shumardella
Type: Petasmaria
Ecology: stationary epifaunal suspension feeder
Distribution:
• Permian of Canada (7: Nunavut, Yukon collections), China (1), Laos (1), Mexico (11), Mongolia (1), New Zealand (1), Pakistan (1), the Russian Federation (22), United States (73: Arizona, California, Idaho, Nevada, New Mexico, Texas, Utah, Wyoming)
• Carboniferous of Canada (3: Alberta, Nova Scotia), China (1), the Russian Federation (2), the United Kingdom (1), United States (44: Alaska, Arizona, Idaho, Illinois, Iowa, Kansas, Missouri, Montana, Nebraska, New Mexico, Texas, Utah, Wyoming)
• Devonian of Afghanistan (2), Canada (3: Alberta, British Columbia), China (1), Iran (2), Morocco (1), the Russian Federation (1), United States (39: Arizona, Colorado, Iowa, Michigan, Montana, Nevada, New Mexico, New York)
Total: 218 collections including 239 occurrences