Metretopus omelkoi Tiunova, 2012, sp. nov.

• Main Author: Tiunova, Tatiana M.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Ephemeroptera; Metretopodidae; Metretopus; Metretopus omelkoi; Stripe; Primorskiy; White Head; taiga
• Online Access: https://zenodo.org/record/6180773; https://doi.org/10.5281/zenodo.6180773

Metretopus omelkoi sp. nov. (Figs 1 –35) Material examined. Holotype male imago, RUSSIA, Primorskiy Kray, Ussuriiskii region, Mountain-Taiga Station of Far-Eastern Branch of Russian Academy of Sciences, temporary stream along the road, 4.VI. 2011, T. Tiunova. Paratypes: collected together with the holotype: 80 male and 50 female imagines, 15 male and 17 female subimagines, and 60 mature larvae. Description. Male imago (in alcohol). Length (mm)—body 7.4–9.2; forewings 8.2–9.2; cerci 17.0– 19.3. Total color of living imago brown with brightly yellow, blown-up membranous connection in the root of wings and between anepisternum and the posterior arm of the prealar bridge (Fig. 32). After fixing in alcohol, yellow coloring becomes white. Head: upper portion of eyes gray-brown; lower portion dark gray. Eyes contiguous dorsally. Medial and lateral eyes dark brown. Thorax: Pronotum brown with narrow white stripe along the middle part of the posterior margin (Fig. 1). Medioscutum and submedioscutum dark brown; color of median longitudinal suture varies in different specimens from pale to dark brown. Scutellum brown with thin white median stripe. Infrascutellum and parascutellum dark. Posterior scutellar protuberance with light brown spot on the anterior margin. Scutoscutellar impression ranging from light brown at the base to white in the distal region (Fig. 1). Fore legs brown; middle and hind legs from light brown to yellowish with brown joints. Length (mm) of the fore leg segments: femora 1.9–2.3; tibia 1.5–1.9; tarsal segments 0.4–0.6, 0.9–1.2, 0.9–1.2, 0.7–0.9, and 0.4–0.5. Wings hyaline and brownish; all veins brown; pterostigma whitish (Figs 9–10). Abdomen: terga from brownish to brown and translucent; lateral margin of terga dark brown; tergum I dark brown; terga II–III light brown, and IV–VII, grayish; terga II–VII having a wide medial hyaline stripe with a pair of tear-shaped brown spots on the anterior margin; terga VIII–IX brown with a white granular coating and not transparent; terga VIII–IX with median ...