Shilovia yakovlevi Makarchenko et Semenchenko, 2020

Makarchenko, Eugenyi A., Semenchenko, Alexander A. & Palatov, Dmitry M., 2020, Review of the genus Shilovia Makarchenko (Diptera: Chironomidae: Diamesinae Boreoheptagyiini) from the mountains of Central Asia, with morphological description and DNA barcoding of known species, Zootaxa 4895 (2), pp. 196-210 : 203-207

Shilovia yakovlevi Makarchenko et Semenchenko , sp. nov.

http://zoobank.org/NomenclaturalActs/ 44D857C4-18D5-4E37-8539-B6AB9EE74BC7

( Figs. 17–20 , 23, 26 )

Type material. Holotype, adult male, KAZAKHSTAN: East Kazakhstan Region, Saur-Tarbagatay Mountain system, Zaysan District, Zhemenei River , below the dam in Zaysan Reserve , altitude 648 m above sea level, 13.VII.2018, N 47°27.442’, E 84°52.411’, leg. D. Palatov. Paratype: 5 adult males, the same data as holotype .

Derivatio nominis. The species is named after the lepidopterist Dr. Yakovlev Roman Viktorovich (Altai State University, Barnaul, Russia), who greatly contributed to the study of the entomofauna of the Altai-Sayan and Central Asian regions and, in particular, the Saur mountains.

Description

Adult male (n=3, except when otherwise stated). Total length 1.9–2.1 mm. Total length/wing length 0.93– 1.06.

Coloration. Brown to dark brown. Mesonotum dark brown in anterior 2/3 and brown to light brown in posterior 1/3; dorsocentrals situated in light stripes ( Fig. 18 ). Scutellun brownish grey. Wings grey. Legs: at least basal 3/4 of femur yellowish or yellow, distal 1/4 dark brown; tibia, ta 1 –ta 5 brown to dark brown. Abdomen dark brown.

Head. Eyes bare. Temporal setae 56–60, including frontals, verticals, postorbitals which can not be easy separated. Clypeus with 12–19 setae. Palpomere length (μm): 24–36, 40–52, 76–92, 88–92, 136–156. Head width/palpal length 0.90–1.11. Antenna with 6 flagellomeres and reduced plume of setae; number of setae on 1–5 flagellomeres respectively: 4–5, 5, 5–6, 5, 5–6; length of setae on 1–5 flagellomeres 48–56 μm; terminal flagellomere with 2–3

setae, 24–28 μm long in subapical and apical area. Length of 1–6 flagellomeres (μm): 48–52, 32, 28–36, 28–38, 32–34, 6–84; AR 0.39–0.44. Antennal length/palpal length 0.61–0.71.

Thorax. Antepronotum with 6–10 ventrolateral setae, 40–50 μm long. Acrostichals 30–56, 20–28 μm long, start from anteropronotum, in 1–3 rows. Dorsocentrals 46–71,12–24 μm long, in 2–4 rows, in anterior part of mesono-tum reach preanal setae, and in posterior part they are not converge with acrostichal setae ( Fig. 18 ); prealars 30–34, 40–64 μm long, in 2–3 rows; supraalars 3, 30–40 μm long. Scutellum with 40–51 setae, 72–80 μm long. Postnotum without setae. Preepisternum with 9–13 setae, 28–40 μm long. MAII with 2–3 setae, ca 32 μm long.

Wing. Length 1.76–2.24 mm, width 0.52–0.56 mm. Costal extension 40–48 µm long. Anal lobe slightly reduced, rounded-angular. Squama with 5–15 setae, 44–60 μm long. R and R 1 with 36–50 setae; R 4+5 with 8–10 setae, R 2+3 absent, Cu and An without setae ( Fig. 17 ). RM/MCu 1.7–2.0.

Legs. Spur of front tibia 48–52 µm long. Two spurs of mid tibia 56–60 µm long. Spurs of hind tibia 72 µm and 60–64 µm long. Hind tibial comb with 10–11 setae. Fore leg with 2 pseudospurs on ta 1, 28– 30 µm long; mid leg with 2 pseudospurs, 24–28 µm long on ta 1; hind legs with 2–5 pseudospurs 28–36 µm long on ta 1. Length (μm) and proportions of leg segments are as in Table 3.

Hypopygium ( Figs. 19–20 , 23, 26 ). Tergite IX with 49–56 setae, 10–12 µm long; posterior edge almost straight or slightly concave ( Fig. 20 ). Laterosternite IX with 3–6 setae, 10–14 µm long Sternapodeme length 80–84 µm and 36–80 µm wide in basal part, 16–28 µm wide in subapical part. Aedeagal lobe weakly sclerotized, apical part fingerlike, 96–100 µm long; phallapodeme sclerotized, 72–76 µm long ( Fig. 26 ). Gonocoxite 320–380 µm long, with 80–100 µm long apical projection (“heel”) which densely covered with thin setae, 35–52 µm long, and “heel” posterior to gonostylus 0.45–0.54 times as long as gonostylus; inferior volsella in form of tubercle, densely covered with macrotrichiae and setae, 16–24 µm long ( Fig. 19–20 ). Gonostylus wide in basal part, in middle part strongly curved, 164–188 µm long, in distal half covered with setae, 6–12 µm long, on the outer edge without rounded extension, apically with yellowish-brown megaseta 8 µm long and dark brown or black tooth ( Figs. 19–20 , 23 ); gonostylus length/gonostylus width 5.22–7.20. HR 2.0–2.13.

Diagnosis. See the key below.

Ecology. Adults, pupae and larvae were collected from stones and bowlders in mountain river, located at an altitude of 648 m, at a flow rate of 1.0– 1.2 m /s.

Distribution. Known only from the type locality – Saur Mountains of East Kazakhstan ( Fig. 31 ).

Figures

FIGURES 16–20. Shilovia xinhuawangi sp. nov. (16) and S. yakovlevi sp. nov. (17–20), males. 16, legs; 17, basal part of wing; 18, dorsal part of mesonotum; 19, gonocoxite and gonostylus; 20, part of hypopygium in dorsal view. Designations are the same as in Figures 1–9.

FIGURES 21–27. Shilovia rara Makarchenko (21, 24–25), S. xinhuawangi sp. nov. (22, 27) and S. yakovlevi sp. nov. (23, 26), males. 21–23, gonostylus; 24, inferior volsella and basal lobe of gonocoxite; 25–27, sternapodeme, phallapodeme and aedeagal lobe. Scale bars: 50 µm.

FIGURES 28–31. Type localities of Shilovia rara Makarchenko (28–29), S. xinhuawangi sp. nov. (30), and S. yakovlevi sp. nov. (31). 28, Varzob River near Kondara Gorge, Varzod District, Tajikistan (photo by M.V. Vinarski); 29, Itelgi River, Chatkal District, Kyrgyzstan, (photo by E.S. Chertoprud); 30, Daong River, Xinjiang Uygur Autonomous Region, China (photo by M.V. Vinarski); 31, Zhemenei River, East Kazakhstan Region, Kazakhstan (photo by M.V. Vinarski).