Morphological key to adults of Dictyogenus

1 Females ..……………………………………….. 2

1’ Males ………………………..………………….. 3

2 Subgenital plate covering majority of sternum 9 (Figs. 60, 61). Macropterous (Fig. 61) ……………………..……. Dictyogenus alpinum

2’ Subgenital plate covering at most the anterior half of sternum 9 (Figs. 9, 36, 83, 84). Macropterous or more rarely brachypterous (Fig. 78) …………… Dictyogenus jurassicum, D. muranyii, D. fontium species complex (not keyed)

3 Hemitergal lobes separated from the inner anterior corner of each hemitergum by a wide V-shaped membranous area (Figs. 3, 29, 32, 81). Apex of frontal epiproct sclerite nearly straight in lateral view, “dagger-like” (Figs. 5, 6, 33, 80). Lateral stylets apically enlarged (Figs. 5, 6, 33, 34, 80) ………………………….. 4

3’ Hemitergal lobes separated from the inner anterior corner of each hemitergum by a narrow V-shaped sclerotized area (Fig. 56). Hemitergal lobes wide and bulky, hardly bent upwards, pointing almost horizontally toward each other (Fig. 56). Apex of frontal epiproct sclerite with a strong curvature in lateral view, “claw-like” (Fig. 57). Epiproct sides straight, in dorso-caudal view (Fig. 58). Lateral stylets thinning progressively toward apex (Fig. 57) ………….. Dictyogenus alpinum

4 Hemitergal lobes strongly bent upwards (Figs. 3, 81) …………………………………………… 5

4’ Hemitergal lobes hardly bent upwards, slender, bulb-shaped with a slight distal knob (Fig. 30). Apex of frontal epiproct sclerite straight and with a median curvature, in lateral view (Fig. 33). Epiproct sides rounded, in dorso-caudal view (Fig. 35). Lateral stylets not getting thinner progressively toward apex (Figs. 33, 34) ………….. Dictyogenus muranyii

5 Apex of frontal epiproct sclerite straight and with a median curvature, in lateral view (Figs. 5, 6). Lateral stylets apically enlarged (Figs. 5, 6) …………………….. Dictyogenus jurassicum

5’ Apex of frontal epiproct sclerite straight, angled posteriorly, in lateral view (Fig. 80) ………. Dictyogenus fontium species complex