Classification of the genus Petasmatherus
G. †Petasmatherus Cooper and Grant 1969
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†Petasmatherus depressus Cooper and Grant 1976
†Petasmatherus mundus Cooper and Grant 1976
†Petasmatherus nitidus Cooper and Grant 1976
†Petasmatherus opulus Cooper and Grant 1969
†Petasmatherus pumilus Cooper and Grant 1976
†Petasmatherus pusillus Girty 1908
†Petasmatherus recticardinatus Cooper and Grant 1976