†family Petasmatheridae Cooper and Grant 1976 (lamp shell)

Rhynchonellata - Rhynchonellida - Petasmatheridae

Parent taxon: Wellerelloidea according to A. Williams et al. 2002

Sister taxa: Allorhynchidae, Amphipellidae, Pontisiidae, Sinorhynchiidae, Wellerellidae

Subtaxa: Elassonia Iotina Petasmatherus Ptygmactrum

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Type: Petasmatherus

Ecology: stationary epifaunal suspension feeder

Distribution:

• Permian of Mexico (2 collections), United States (71: Nevada, New Mexico, Texas, Utah)

• Carboniferous of Canada (1: Nunavut)

Total: 74 collections including 99 occurrences

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