†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
Type: Petasmatherus
Ecology: stationary epifaunal suspension feeder
Distribution: