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FIGURES 4–6 in Contribution to the knowledge of the fossil subgenus Nestormeus Godunko, 2004 (Ephemeroptera: Heptageniidae: Ecdyonurus) from the Baltic amber (Eocene)

FIGURES 4–6. Ecdyonurus (Nestormeus) groehnorum sp. nov., holotype, female imago: 4, tip of abdomen ventrally; 5, mesothorax ventrally; 6, body ventrally.

FIGURES 1–3 in Contribution to the knowledge of the fossil subgenus Nestormeus Godunko, 2004 (Ephemeroptera: Heptageniidae: Ecdyonurus) from the Baltic amber (Eocene)

FIGURES 1–3. Ecdyonurus (Nestormeus) groehnorum sp. nov., holotype, female imago: 1, head and thorax laterally and dorsally; 2, body ventrally; 3, tip of abdomen ventrally; 1–2: scale bars = 1 mm; 3: scale bar = 0.5 mm.

FIGURES 1–3 in Description of Ecdyonurus solus sp. nov., a new species of the Ecdyonurus venosus species-group (Ephemeroptera: Heptageniidae) from the Crimean Peninsula, Ukraine

FIGURES 1–3. Ecdyonurus solus sp. nov., male imago, paratype: 1, head, dorsal view; 2, head, lateral view; 3, abdominal segments 4-7, lateral view.

FIGURES 15–19 in Description of Ecdyonurus solus sp. nov., a new species of the Ecdyonurus venosus species-group (Ephemeroptera: Heptageniidae) from the Crimean Peninsula, Ukraine

FIGURES 15–19. Ecdyonurus solus sp. nov., larva, paratype: 15, abdomen, dorsal view; 16, two kinds of posterior margin of terga; 17, gill 1; 18, gill 4; 19, gill 7.

FIGURES 20–25 in Description of Ecdyonurus solus sp. nov., a new species of the Ecdyonurus venosus species-group (Ephemeroptera: Heptageniidae) from the Crimean Peninsula, Ukraine

FIGURES 20–25. Ecdyonurus solus sp. nov., egg: 20, general outline of the egg, scale bar = 100 µm; 21, egg pole with gather of large KCTs attachment structures, scale bar = 50 µm; 22, detail of large KCTs, scale bar = 10 µm; 23, chorionic surface with KCTs attachment structures, tubercles and small granules, scale bar = 20 µm; 24, tubercles and small granules at high magnification, scale bar = 3 µm; 25, micropyle, scale bar = 10 µm (HITACHI S-4700 scanning electron microscope).

FIGURES 7–14 in Description of Ecdyonurus solus sp. nov., a new species of the Ecdyonurus venosus species-group (Ephemeroptera: Heptageniidae) from the Crimean Peninsula, Ukraine

FIGURES 7–14. Ecdyonurus solus sp. nov., larva, paratype: 7, two kinds of lateral part of labrum; 8, hypopharynx; 9, glossa and paraglossa; 10, pronotum; 11, hind leg; 12, shape of femoral scales; 13, outer margin of femur; 14, tarsal claw.

FIGURES 4–6 in Description of Ecdyonurus solus sp. nov., a new species of the Ecdyonurus venosus species-group (Ephemeroptera: Heptageniidae) from the Crimean Peninsula, Ukraine

FIGURES 4–6. Ecdyonurus solus sp. nov. Figs 4–5, male imago, holotype: 4, male genitalia, ventral view; 5, penis lobe, dorsal view. Fig 6, female imago, paratype: tip of abdomen, ventral view.

FIGURES 33–36 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 33–36. Details of the mandibles of Rh. parva (Figs 33–34) and Rh. ampla (Fig. 35–36). Figs 33 and 35: right mandible; Figs 34 and 36: left mandible; arrow indicates the row of thin and short setae.

FIGURES 14–19 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 14–19. Mouthparts of Rh. sumatrana. Fig. 14: left mandible; Fig. 15: right mandible; Fig. 16: comb-shape setae on the galea-lacinia; Fig. 17: outer dentiseta (arrow); Fig. 18: hypopharynx; Fig. 19: labium.

FIGURES 10–13 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 10–13. Larval structures of Rh. sumatrana (Figs 10 and 12) and Rhithrogena parva (Figs 11 and 13). Figs 10–11: labrum in dorsal position; Figs 12–13: gill I

FIGURES 27–32 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 27–32. Rh. parva male and female imagos. Fig. 27: male genitalia; Fig. 28: penis lobe in ventral position, with a drawing of the other titillators; Fig. 29: the same in dorso-lateral position; Fig. 30: the same in dorso-apical position; Fig. 31: detail of the fore tarsal claw of the male imago; Fig. 32: outline of the female subanal plate.

FIGURES 24–26 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 24–26. Posterior margin of abdominal tergites IV–V. Fig. 24: Rh. sumatrana; Fig. 25: Rh. parva; Fig. 26: Rh. ampla.

FIGURES 1–7 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 1–7. Hind legs of different Heptageniidae female imagos. Fig. 1: Rhithrogena sumatrana; Fig. 2: Rhithrogena cf. hybrida; Fig. 3: Rhithrogena parva; Fig. 4: Paegniodes cupulatus (all Rhithrogeninae); Fig. 5: Heptagenia sulphurea (Heptageniinae); Fig. 6: "Thalerosphyrus" sinuosus; Fig. 7: "Thalerosphyrus" determinatus (Ecdyonurinae). All at the same scale

FIGURES 20–23 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 20–23. Leg larval structures of Rh. sumatrana. Fig. 20: bristles on the dorsal face of hind femora; Fig. 21: tarsal claw. Shape of the lateral sclerites on the first abdominal sternite. Fig. 22: Rh. sumatrana; Fig. 23: Rh. parva.

FIGURES 8–9 in What is Ecdyonurus sumatranus Ulmer, 1939? A contribution to the knowledge of the genus Rhithrogena in the Oriental Region (Ephemeroptera, Heptageniidae)

FIGURES 8–9. Egg structures of Rh. sumatrana (Fig. 8) and Paegniodes cupulatus (Fig. 9). a: egg in toto; b: detail of the pole; c: micropyle area.

FIGURES 59–61 in A new subspecies of the subgenus Ecdyonurus Eaton, 1868 (Ephemeroptera: Heptageniidae) from the East of Ukraine

FIGURES 59–61. Sampling sites of Ecdyonurus dispar gratificus ssp. nov.: 59, Bulavyna River, vicinity of Debaltsevo urban settlement (April, 2011); 60, stream, vicinity of Fashchevka village (October, 2009); 61, stream, right tributary of Bulavyna River, vicinity of Debaltsevo urban settlement (April, 2011).

FIGURES 52–55 in A new subspecies of the subgenus Ecdyonurus Eaton, 1868 (Ephemeroptera: Heptageniidae) from the East of Ukraine

FIGURES 52–55. Ecdyonurus dispar gratificus ssp. nov., egg: 52, general outline of the egg, scale bar = 10 μm; 53–54, chorionic surface with tubercles and attachment structures (KCTs), scale bar = 10 μm; 55, micropyle, scale bar = 10 μm.

FIGURES 17–20 in A new subspecies of the subgenus Ecdyonurus Eaton, 1868 (Ephemeroptera: Heptageniidae) from the East of Ukraine

FIGURES 17–20. Ecdyonurus dispar gratificus ssp. nov., coloration of larvae, paratypes: 17, male mature larva, dorsal view, scale bar = 1 mm; 18, female mature larva, dorsal view, scale bar = 1 mm; 19, head and thorax of female mature larva, dorsal view; 20, young male larva, dorsal view, scale bar = 1 mm.

FIGURES 9–13 in A new subspecies of the subgenus Ecdyonurus Eaton, 1868 (Ephemeroptera: Heptageniidae) from the East of Ukraine

FIGURES 9–13. Ecdyonurus dispar gratificus ssp. nov., male imagoes: 9, genitalia of holotype, dorsal view; 10, genitalia of holotype, ventral view; 11, penis lobe of holotype, ventral view; 12, penis lobe of holotype, dorsal view; 12a, teeth of basal sclerite; 13, penis lobe of paratype, dorsal view.

FIGURES 57–58 in A new subspecies of the subgenus Ecdyonurus Eaton, 1868 (Ephemeroptera: Heptageniidae) from the East of Ukraine

FIGURES 57–58. Sampling sites of Ecdyonurus dispar gratificus ssp. nov.: 57–58, different stations of Bulavyna River, vicinity of Debaltsevo urban settlement (May, 2010).