Makarchenkoia Krasheninnikov, 2024

Krasheninnikov, Andrey B. & Vshivkova, Kristina A., 2024, Makarchenkoia gen. nov., a new genus of Orthocladiinae (Diptera, Chironomidae) from Arctic, Zootaxa 5551 (2), pp. 387-393 : 388

Makarchenkoia Krasheninnikov , gen. nov.

http://zoobank.org/NomenclaturalActs/ 3F474577-9C54-4327-ADC7-E8AFA3D6A01C

Type species: Makarchenkoia samoyedica Krasheninnikov , sp. nov. by present designation.

Derivatio nominis. The genus is named in honor of the chironomid’s researchers Marina and Evgenyi Makarchenko.

Diagnostic characters. Eye bare, reniform, without dorsomedial extension. Apex of antenna without apical or subapical seta. Palp consists of 5 segments. Anal lobe of wing reduced. Squama without setae. R 4+5 ending distal to end of M 3+4. FCu distal to FR. Wing with punctation under ×400 magnification. Antepronotum with 0–2 ventrolateral setae. Acrostichals begin at the border with antepronotum, hooked, single-row near the pronotum, double-row closer to the middle of the mesonotum. Hind tibial comb well developed. Lateral spines on spurs of mid and hind legs appressed to shaft of spur or weakly diverge from shaft of spur on hind tibiae. Pseudospurs abresent. Pulvilli reduced, empodium present. Tergite IX is densely covered with spinous microtrichia. Anal point is naked, microtrichia are located only at its base, but 0-2 setae are located laterally. At the top, anal point sharply thins without changing its width. Gonocoxite with a relatively well-developed rounded or rectangular superior volsella covered short setae. Inferior volsella consists of a dorsal part in the form of a small protrusion and a ventral part in the form of a cushion, densely covered with short setae. Transverse sternapodeme convex. Virga weak.

Description. Adult male. Total length 2.1–2.5 mm. Head, thorax, abdomen and legs light brown or dark brown.

Head. Eye bare, reniform, without dorsomedial extension. AR 0.54–0.89, consists of 13 segments. Apex of antenna without apical or subapical seta. Temporal setae including 1–2 inner verticals, 2 outer verticals and 0–2 postorbitals. Clypeus with 6–7 setae. Palp consists of 5 segments.

Wing. Wing with punctation under ×400 magnification. R with 5–7, R 1 and R 4+5 without setae. Anal lobe reduced. R 4+5 ending distal to end of M 3+4. R 2+3 weak. FCu distal to FR. Brachiolum, other veins and membrane bare. Squama without setae.

Thorax.Antepronotum with 0–2 ventrolateral setae.Acrostichals 15–24 (begin at the border with antepronotum, hooked, single-row near the pronotum, double-row closer to the middle of the mesonotum), dorsocentrals 2–8, prealars 2–3, scutellars 4–5.

Legs. Hind tibial comb consists of 9–11 setae. Pseudospurs abresent. Pulvilli reduced, empodium present. Lateral spines on spurs of mid and hind legs appressed to shaft of spur or weakly diverge from shaft of spur on hind tibiae.

Hypopygium. Laterosternite IX with 7–9 setae. Tergite IX with 10–19 setae on sides of anal point base.Anal point part protruding beyond tergite IX on 53–94 µm. Tergite IX is densely covered with spinous microtrichia.Anal point is naked, microtrichia are located only at its base, but 0–2 setae are located laterally. At the top, anal point sharply thins without changing its width. Gonocoxite with a relatively well-developed rounded or rectangular superior volsella covered short setae. Inferior volsella consists of a dorsal part in the form of a small protrusion and a ventral part in the form of a cushion, densely covered with short setae. Transverse sternapodeme convex. Virga weak.

Female, pupa and larva. Unknown.

Taxonomic notes. The new genus is most closely related in structure to some species of Hydrobaenus and Chaetocladius , but differs from them in the structure of the spurs, the naked squama, acrostichals begin at the border with antepronotum, well-developed rounded or rectangular superior volsella ( Saether et al. 2000).