DESCRIPTION OF THE IMAGINES OF RHITHROGENA-GOELDLINI SARTORI AND SOWA, 1988, AND KEYS FOR THE IDENTIFICATION OF IMAGINES OF THE EUROPEAN SPECIES OF THE RHITHROGENA-DIAPHANA SUBGROUP (EPHEMEROPTERA, HEPTAGENIIDAE)

The male and female imagines of Rhithrogena goeldlini Sartori and Sowa , 1988 are described and drawn on the basis of material collected in P ortugal close to the type locality. Features distinguishing male imagi nes of the European species of the R. diaphana-subgroup are keyed.