Dictyogenus, Klapalek, 1904

Reding, Jean-Paul G., Launay, Bertrand, Doaré, Jacques Le, Ruffoni, Alexandre & Vinçon, Gilles, 2019, Two New Species Of Dictyogenus Klapálek, 1904 (Plecoptera: Perlodidae) From The Jura Mountains Of France And Switzerland, And From The French Vercors And Chartreuse Massifs, Illiesia 15 (2), pp. 27-64 : 49-51

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

Figures

Figs. 58-61. Dictyogenus alpinum, male and female adults. 58. Adult male, epiproct, dorso-caudal view. Nant Bénin River, Savoie dpt, France. Photo B. Launay. 59. Adult male, posterior margin of sternite 7 with ventral vesicle, ventral view. Nant Bénin River, Savoie dpt, France. Photo B. Launay. 60. Female, subgenital plate, ventral view. Ristolas – Mount Viso, Queyras, Hautes-Alpes dpt, France. Photo J.-P. G. Reding. 61. Adult female, subgenital plate, ventral view. Guiers vif, Chartreuse, Savoie dpt, France. Photo A. Ruffoni. pointing almost horizontally toward each other (Figs. 29, 32). Hemitergal lobes more

Fig. 9. Dictyogenus jurassicum sp. n., female, subgenital plate, ventral view. Spring of River Doubs, Mouthe, Doubs dpt, France. Photo A. Ruffoni.

Fig. 36. Dictyogenus muranyii sp. n., female, subgenital plate. Karstic spring of Brudour, Drôme dpt, France. Photo B. Launay.

Fig. 83. Dictyogenus fontium species complex, female, subgenital plate. Inner-alpine upper Isère Valley. Col de l’Iseran, Savoie dpt, France. Photo A. Ruffoni.

Fig. 84. Dictyogenus fontium species complex, female, subgenital plate. Rhaetian Alps, Switzerland. Photo J.- P.G. Reding.

Fig. 78. Dictyogenus fontium species complex, adult female habitus. Inner-alpine upper Isère Valley. Col de l’Iseran, Savoie dpt, France. Photo A. Ruffoni.

Figs. 2-3. Dictyogenus jurassicum sp. n. 2. Adult female, head and pronotum. Spring of River Doubs, Mouthe, Doubs dpt, France. Photo A. Ruffoni. 3. Adult male, hemitergites, dorsal view. Karstic spring at Charabotte Mill, Ain dpt, France. Photo B. Launay.

Figs. 29-30. Dictyogenus muranyii sp. n., male terminalia. 29. Hemitergal lobes, dorsal view. Karstic spring of Bruyant, Isère dpt, France. Photo B. Launay. 30. Hemitergal lobes, lateral view. Karstic spring of Bruyant, Isère dpt, France. Photo B. Launay.

Figs. 32-35. Dictyogenus muranyii sp. n., male terminalia. 32. Hemitergal lobes, dorsal view. Karstic spring of Font Noire, Isère dpt, France. Photo B. Launay. 33. Epiproct, lateral view. Karstic spring of Font Noire, Isère dpt, France. Photo B. Launay. 34. Lateral stylet, lateral view. Karstic spring of Brudour, Drôme dpt, France. Photo B. Launay. 35. Epiproct, dorso-caudal view. Karstic spring of Font Noire, Isère dpt, France. Photo B. Launay.

Figs. 79-82. Dictyogenus fontium species complex, adults. 79. Female, head and pronotum. Inner-alpine upper Isère Valley. Col de l’Iseran, Savoie dpt, France. Photo A. Ruffoni. 80. Adult male, epiproct with frontal apical sclerite and lateral stylet, lateral view. Julian Alps, Slovenia. Photo J.-P.G. Reding. 81. Adult male hemitergal lobes, dorsal view. Rhaetian Alps, Switzerland. Photo J.-P.G. Reding. 82. Adult male, posterior margin of sternite 7 with ventral vesicle, ventral view. Rhaetian Alps, Switzerland. Photo J.-P.G. Reding.

Figs. 4-5. Dictyogenus jurassicum sp. n., adult male. 4. Hemitergal lobe, lateral view. Karstic spring at Charabotte Mill, Ain dpt, France. Photo B. Launay. 5. Epiproct and lateral stylet, lateral view. Karstic spring at Charabotte Mill, Ain dpt, France. Photo B. Launay.

Figs. 6-7. Dictyogenus jurassicum sp. n., adult male. 6. Epiproct and lateral stylet, lateral view. Karstic spring at Charabotte Mill, Ain dpt, France. Photo B. Launay. 7. Posterior margin of sternite 7 with ventral vesicle, ventral view. Karstic spring at Charabotte Mill, Ain dpt, France. Photo J.-P.G. Reding.

Fig. 56. Dictyogenus alpinum, male, hemitergal lobes, dorsal view. Nant Bénin River, Savoie dpt, France. Photo B. Launay.

Fig. 57. Dictyogenus alpinum, male, epiproct, lateral view. Nant Bénin River, Savoie dpt, France. Photo B. Launay.