Rhynchonellata - Rhynchonellida - Petasmariidae

Full reference: W. H. Easton. 1962. Carboniferous formations and faunas of central Montana. United States Geological Survey Professional Paper 348:1-126

Belongs to Pugnoides according to Easton 1962

Sister taxa: Pugnax (Pugnoides) tantillus, Pugnoides mazhalaensis, Pugnoides tardivenus

Ecology: stationary epifaunal suspension feeder