Shilovia xinhuawangi 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 : 202-203

Shilovia xinhuawangi Makarchenko et Semenchenko , sp. nov.

http://zoobank.org/NomenclaturalActs/ EFD248D8-FC5F-46E7-938D-A137BAF6071D

( Figs. 10–16 , 22, 27 )

Type material. Holotype, adult male, CHINA: Xinjiang Uygur Autonomous Region, Tien Shan Mountains, Bogdo-Ula Range , Daong River , altitude 2030 m above sea level, 8.VII.2017, N 43°51.346’, E 88°09.633’, leg. D. Palatov. Paratypes: 41 adult males, the same data as holotype .

Derivatio nominis. The species is named in honour of the Chinese chironomid taxonomist, Professor of Nankai University Xinhua Wang.

Description

Adult male (n = 6, except when otherwise stated). Total length 2.16–2.36 m. Total length/wing length 0.95– 1.07.

Coloration. Brown to dark-brown. Mesonotum dark brown ( Fig. 12 ). Wings grey. Legs: at least basal 3/4 of femur yellowish or yellow, distal 1/4 dark brown; tibia, ta 1 –ta 5 dark brown ( Fig. 16 ). Abdomen dark brown.

Head. Eyes pubescent. Temporal setae 70–72, including frontals, verticals, postorbitals which can not be easy separated. Clypeus with 11–12 setae. Palpomere length (μm): 28–32, 68–76, 108–116, 108–124, 180–182. Head width/palpal length 0.88–0.95. Antenna with 6 flagellomeres and reduced plume of setae ( Fig. 11 ); number and length of these setae on 1–5 flagellomeres respectively: 5–7 (40–64 μm), 5–6 (48–72 μm), 3–5 (40–68 μm), 5–6 (40–80 μm); terminal flagellomere with 2–3 setae, 24–40 μm long in subapical and apical area. Length of 1–6 flag-ellomeres (μm): 52–64, 40, 38–44, 32–40, 32–40, 68–84; AR 0.32–0.37. Antennal length/palpal length 0.54–0.62.

Thorax. Antepronotum with 10–15 ventrolateral setae, 40–60 μm long. Acrostichals 29–46, 16–40 μm long, start from anteropronotum, in 1–2 rows. Dorsocentrals 50–70, 25–48 μm long (Fig. 00), in 2–4 rows, in anterior part of mesonotum reach preanal setae, and in posterior part they converge with acrostichal setae ( Fig. 12 ); prealars 35–84, 44–80 μm long, in 2–3 rows; supraalars 4–7, 36–40 μm long. Scutellum with 48–52 setae, 64–76 μm long. Postnotum with 4–17 setae, 40–52 μm long ( Fig. 13 ). Preepisternum with 14–21 setae, 28–48 μm long. MAII with 2–3 setae, 36 μm long.

Wing. Length 2.16–2.36 mm, width 0.58–0.64 mm. Costal extension 60–70 µm long. Anal lobe slightly re-duced, rounded-angular. Squama with 12–23 setae, 40–68 μm long, in 1–3 rows. R and R 1 with 46–53 setae, in basal ¼ in 2 rows; R 4+5 with 9–19 setae, R 2+3 absent, Cu with 5–14 setae, An with 2–16 setae in basal part ( Fig. 10 ). RM/MCu 1.6–2.0.

Legs. Spur of front tibia 36–64 µm long. Spurs of mid tibia 44–60 µm and 48–64 µm long. Spurs of hind tibia 72–84 µm and 44–68 µm long. Hind tibial comb with 11–13 setae. Fore leg with 2 apical pseudospurs on ta 1, 36– 40 µm long; mid leg with 2–5 pseudospurs, 32–36 µm long on ta 1, hind legs with 4–6 pseudospurs, 32–40 µm long on ta 1. Length (μm) and proportions of leg segments are as in Table 2.

Hypopygium ( Figs. 14–15 , 22, 27 ). Tergite IX with 69–77 setae, 8–20 µm long; posterior edge almost straight ( Fig. 14 ). Laterosternite IX with 4–5 setae, 20–24 µm long. Sternapodeme length 84–120 µm and 68–92 µm wide in basal part, 24–32 µm wide in subapical part. Aedeagal lobe weakly sclerotized, apical part fingerlike or hooked, 120–124 µm long; phallapodeme sclerotized, 60–68 µm long ( Figs.15 , 27 ). Gonocoxite 368–412 µm long, with 68– 88 µm long apical projection (“heel”) which densely covered with thin setae, 48–60 µm long, and “heel” posterior to gonostylus 0.40–0.63 times as long as gonostylus; inferior volsella in form of tubercle, densely covered with macrotrichiae and setae, 8–16 µm long. Gonostylus strongly curved in distal 2/3, 132– 176 µm long, in distal half covered with setae, 5–12 µm long, on the outer edge without rounded extension, apically with yellowish-brown megaseta and dark brown or black tooth ( Figs. 14–15 , 22 ); gonostylus length/gonostylus width 2.86–3.67. HR 2.06–2.51.

Diagnosis. See the key below.

Ecology. Adults, pupae and larvae were collected from stones and boulders in mountain river, located at an altitude of 2030 m, at a flow rate of 0.3–0.9 m /s, with water temperatures ca 8°C.

Distribution. Known only from the type locality – Bogdo-Ula Range of Tien Shan Mountains (Xinjiang Uygur Autonomous Region, China) ( Fig. 30 ).

Figures

FIGURES 10–15. Shilovia xinhuawangi sp. nov., male. 10, basal part of wing; 11, antenna; 12, dorsal part of mesonotum; 13, scutellum and postnotum; 14, hypopygium in dorsal view; 15, hypopygium without tergite IX in dorsal view.

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).