TABLE 3 in Revision of the genus Regulaneuria (Ephemeroptera, Heptageniidae, Ecdyonurinae), with description of a new species

TABLE 3. Differentiating characters of Regulaneuria and Asionurus species.
CharactersRegulaneuriaAsionurusMale imagoCompound eyesnot contiugous, widely separated by a distance 2.5–3.0 times frontal ocellus widthcontiguousSpots on forewingwith one or two dark brown spots be- tween the Sc and R1with red spot between the C and ScArrangement of crossveins on forewingregularly or roughly arranged into 5–6 rowsirregularly arrangedTarsus of midleglonger than midtibiashorter than midtibiaStyliger plateconvex medially with remarkable sub- lateral protuberancesconvex medially without or with tiny sublateral protuberancesPenes lobesalmost totally fusedalmost totally fusedFemale imagoSubgenital plategreatly elongated posteriorlynot elongatedSubanal platetongue-shapetriangleNymphSuperlinguawith slightly sharpened tipwith extremely sharpened tip
Pronotum distinctly extended laterally distinctly extended laterally