Diamesa marinskiyi Makarchenko et Semenchenko, 2022

Makarchenko, Eugenyi A., Semenchenko, Alexander A. & Palatov, Dmitry M., 2022, Taxonomy of Diamesa steinboecki group (Diptera: Chironomidae: Diamesinae) with description and DNA barcoding of new species. I. Subgroups steinboecki and longipes, Zootaxa 5125 (5), pp. 483-512 : 492-494

publication ID	https://doi.org/ 10.11646/zootaxa.5125.5.2
publication LSID	lsid:zoobank.org:pub:39EBA798-29B1-4450-9085-A4FB6D1DB331
DOI	https://doi.org/10.5281/zenodo.6458136
persistent identifier	https://treatment.plazi.org/id/13FFB920-1638-4723-A3B4-B884C06C9D09
taxon LSID	lsid:zoobank.org:act:13FFB920-1638-4723-A3B4-B884C06C9D09
treatment provided by	Plazi
scientific name	Diamesa marinskiyi Makarchenko et Semenchenko
status	sp. nov.

Treatment

Diamesa marinskiyi Makarchenko et Semenchenko View in CoL , sp. nov.

http://zoobank.org/NomenclaturalActs/ 13FFB920-1638-4723-A3B4-B884C06C9D09

( Figs. 22–25 View FIGURES 22–25 , 33 View FIGURES 30–36 , 72 View FIGURES 68–74 )

Type material. Holotype, adult male, CHINA: Xinjiang Uygur Autonomous Region, Tien Shan Mountains, Bogdo-Ula Range , Zienzan River , altitude 1923 m above sea level, 9.VII.2017, N 43.828967, E 88.172517, leg. V. Marinskiy GoogleMaps . Paratypes: 18 adult males, the same data as holotype GoogleMaps ; 14 adult males, the same data as holotype GoogleMaps , except Daong River , altitude 2030 m above sea level, 8.VII.2017, N 43.828967, E 88.172517, leg. V. Marinskiy GoogleMaps .

Derivatio nominis. The species is named after the hydrobiologist Marinskiy Vadim Valerievich (Moscow State University, Russia), specialist in aquatic invertebrates of the Central Asia.

Description

Adult male (n = 5). Total length 2.5–2.7 mm. Total length/wing length 0.87–1.20.

Coloration. Dark brown to black. Head, thorax and abdomen dark brown to black. Legs brown to dark brown. Wings dark grey, with brownish veins.

Head ( Fig. 22 View FIGURES 22–25 ). Eyes hairy, reniform. Temporal setae including 8–12 frontals, 8–15 orbitals, 7–10 verticals and 5–6 postorbitals. Clypeus with 2–6 setae. Antenna with 8 flagellomeres and reduced plume of setae; number and length of these setae on 1–7 flagellomeres respectively: 4–5 (32–40 μm), 4 (24–28 μm), 1–2 (24–28 μm), 0, 1–2 (40–48 μm), 1–2 (40–48 μm), 4 (36–52 μm); terminal flagellomere with 2–4 setae, 46–48 μm long in basal part and with 2 subapical setae, 24–28 μm long. Length of 1–8 flagellomeres (μm): 100–116, 44–48, 36–40, 24–30, 28–30, 20–26, 20–24,108–138; AR 0.32–0.39. Palpomere length (μm): 36–48, 64–68, 120–124, 84–90, 108–138. Palpomere 3 in distal part with sensilla capitata with diameter 20 μm. Head width/palpal length 1.0–1.13. Antennal length/palpal length 0.95–0.98.

Thorax. Antepronotum with 12–19 ventrolateral setae, 44–68 μm long. Dorsocentrals 8–10, 112–120 μm long; prealars 9–10, 64–72 μm long. Scutellum with 44–46 setae. AAII with 6–7 setae, 60–68 μm long.

Wing ( Fig. 33 View FIGURES 30–36 ). Length 2.60–2.88 mm, width 0.92–1.04 mm. Costal extension absent. Anal lobe rounded. Squama with 6–10 setae, 32–60 μm long. R and R 1 with 10–20 setae, R 4+5 with 11–15. RM/MCu 1.6–2.2.

Legs. Spur of front tibia 44–50 µm long. Spurs of mid tibia 48–50 µm and 48–50 µm long. Spurs of hind tibia 80–84 µm and 44–48 µm long. Hind tibial comb with 19–20 setae. Length (μm) and proportions of leg segments are as in Table 4.

Hypopygium ( Figs. 23–25 View FIGURES 22–25 ). Tergite IX with 14–16 setae, 40–48 µm long and with narrow (8 µm), pale, and naked anal point, 104–116 µm long which in lateral view apically not curved upwards; posterior edge of tergite IX almost straight, anal–lateral angles are rounded and slightly projecting ( Fig. 23 View FIGURES 22–25 ); anal tergal bands X– type; median tergal band 20–24 µm long. Laterosternite IX with 10–15 setae, 40–44 µm long. Transverse sternopodeme (TSA) triangular, with spire–shape apex, 124–160 µm high, 196–208 µm wide at the base; TSA height/TSA width 0.63–0.80. Aedeagal lobe as in Fig. 25 View FIGURES 22–25 , 144–160 µm long; phallapodeme sclerotized, 108–128 µm long. Gonocoxite 459–508 µm long, in middle part of dorso–internal position with small flattened transverse lobe, 136 µm long and 32 µm wide, directed backwards and with large longitudinal lobe in middle, anterior outer margin of which is rounded and slightly projecting ( Fig. 24 View FIGURES 22–25 ). Gonostylus 197–212 µm long, curved, megaseta in form of wide terminal spine 12–16 μm long, next to it there is tooth and two setae of the same length. HR 2.15–2.50.

Pupa and larva unknown.

Diagnosis. The male of D. marinskiyi sp. nov. is closely related in the subgroup to the D. dragani sp. nov. and D. maisaraensis sp. nov. which have anal tergal bands X-type, but more similar to the latter because both have antenna with 8 flagellomeres, while antenna of D. dragani sp. nov. with 7 flagellomeres. Among other characteristic features of the male D. marinskiyi sp. nov. the following can be noted: has AR 0.32–0.39, dorsocentrals 8–10, scutellars 44–46, femur of front leg length 1624–1476 µm, median tergal band length 20–24 µm, anal point length 104–116 µm. The male of D. maisaraensis sp. nov. has AR 0.39–0.42, dorsocentrals 6–8, scutellars 39–50, femur of front leg length 1880–1960 µm, median tergal band length 28–32 µm, anal point length 100–120 µm.

Ecology. Adult males were collected from stones and boulders in mountain river, located at an altitude of 1923 m and 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. 72 View FIGURES 68–74 ).