Classification of the genus Isophragma
G. †Isophragma Cooper 1956
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†Isophragma extensum Cooper 1956
†Isophragma extensum tricostatum Williams 1962
†Isophragma orientale Andreeva 1985
†Isophragma parallelum Liljeroth et al. 2017
†Isophragma ponderosum Cooper 1956
†Isophragma pseudoretroflexum Reed 1917
†Isophragma ricevillense Cooper 1956
†Isophragma subabbreviatum Cooper 1956