Diamesa zagrosica 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 : 499-501

Diamesa zagrosica Makarchenko et Semenchenko , sp. nov.

http://zoobank.org/NomenclaturalActs/ 678CF541-8E78-4AC4-BE01-B73D857EA04E

( Figs. 37, 41 , 48–49, 53–54, 56 , 76 )

Type material. Holotype, adult male, IRAN: Zagros Mountains, Lorestan Province, Aligudarz County, Dalooni Preserve Park , Dare Daei River in the alpine zone of Zagros ridge, altitude 2244 m above sea level, N 33.186067, E 49.510117, 13.VI.2019, leg. D. Palatov. Paratypes: 4 adult males, the same data as holotype ; 6 adult males, the same data as holotype, except Dez (Sezar) River , 1 km to North of Sepid Dasht Town, alt. 1022 m above sea level, N 33.226117, E 48.885667, 13.VI.2019, leg. D. Palatov.

Derivatio nominis. The species is named as zagrosica after the type locality in Zagros Mountains of Lorestan Province, Iran.

Description

Adult male (n = 5, except when otherwise stated). Total length 2.3–2.8 mm. Total length/wing length 0.89–0.90.

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

Head ( Fig. 37 ). Eyes hairy, reniform. Temporal setae including 6–7 frontals, 10–12 orbitals, 7–13 verticals and 8–9 postorbitals. Clypeus with 9 setae. Antenna with 8 flagellomeres and reduced plume of setae; number and length of these setae on 1–7 flagellomeres respectively: 1–3 (32 μm), 3 (32–36 μm), 3 (32–36 μm), 0, 2 (48–52 μm), 0; terminal flagellomere with 6 setae, 72–88 μm long in basal part and with 2 subapical setae, 28–32 μm long. Length of 1–8 flagellomeres (μm): 80–96, 44–48, 40–44, 28–36, 28–32, 22–24, 22–24,160–164; AR 0.56–0.59. Palpomere length (μm): 44–52, 64–68, 96–100, 96–108, 136–140. Palpomere 3 in distal part with sensilla capitata with diameter 20–22 μm. Head width/palpal length 1.03–1.06. Antennal length/palpal length 0.94–0.97.

Thorax. Antepronotum with 12–13 ventrolateral setae, 64–100 μm long. Dorsocentrals 17–20, 80–140 μm long (2 rows in front); prealars 7–10, 92–104 μm long. Scutellum with ca 20 setae.

Wing. Length 2.56–2.68 mm, width 0.80–0.84 mm. Anal lobe rounded. Squama with 13–16 setae, 20–48 μm long. R and R 1 with 31–37 setae, R 4+5 with 6–9 (in distal part). RM/MCu 2.0–2.5.

Legs. Spur of front tibia 28–36 µm long. Spurs of mid tibia 36–40 µm and 40 µm long. Spurs of hind tibia 68–74 µm and 44 µm long. Hind tibial comb with 17 setae. Length (μm) and proportions of leg segments are as in Table 8 .

Hypopygium ( Figs. 41 , 48–49, 53–54, 56 ). Tergite IX densely covered with strong macrotrichia apices of which are directed anteriorly, with 11–13 setae, 12–22 µm long (laterally setae longer) and with narrow (8–12 µm), weakly chitinized and naked anal point, 120–140 µm long ( Fig. 41 ). Laterosternite IX with 9–16 setae, 24–28 µm long. Transverse sternopodeme (TSA) regular triangular, 84–108 µm high, 162–172 µm wide at the base ( Figs. 53–54 ); TSA height/TSA width 0.49–0.67. Aedeagal lobe 136–168 µm long; phallapodeme sclerotized, 108–112 µm long. Gonocoxite 352–380 µm long; superior volsellae rounded–angular, along margin with 4–6 setae, 28–36 µm long ( Fig. 56 ). Gonostylus 148–168 µm long, weakly curved, slightly expanded in the distal half along the outer edge ( Figs. 48–49 ); in apical part with megaseta in form of wide terminal spine, 8–12 μm long and tooth the same size, next to it there is two setae approximately of the same length. HR 2.15–2.26.

Pupa and larva unknown.

Diagnosis. The male of D. zagrosica sp. nov. is closely related in the subgroup to the D. sakartvella and D. moubayedi sp. nov. from which it can be distinguished by shape and structure of transverse sternopodeme, inferior volsellae and gonostylus. Transverse sternopodeme of D. zagrosica sp. nov. is regular triangular shape ( Figs. 53–54 ), of medium height (84–108 µm) and not very wide basally (162–172 µm), the ratio of its height to width is 0.49–0.67; superior volsellae rounded–angular ( Fig. 56 ); gonostylus slightly expanded in the distal half along the outer edge and with small rounded projection basally ( Figs.48–49 ). Also, male of this species has shortest legs, femur of front leg 1427–1476 µm long. Transverse sternopodeme of D. sakartvella sp. nov. is wide triangular ( Figs. 50–51 ), of low height (68–88 µm) and very wide basally (172–188 µm), the ratio of its height to width is 0.36–0.50; superior volsellae rounded ( Fig. 57 ); gonostylus almost not expanded in the distal half along the outer edge and without projection basally ( Figs.45 ); femur of front leg 1607–1960 µm long. Transverse sternopodeme of D. moubayedi sp. nov. is triangular shape ( Fig. 52 ), of great height (104–140 µm) and not very wide basally (148–184 µm), the ratio of its height to width is 0.80–0.89; superior volsellae angular ( Fig. 55 ); gonostylus expanded in the distal half along the outer edge and with rounded–angular projection basally ( Figs. 40 , 47 ); femur of front leg 1920–2040 µm long.

Ecology. Adult males were collected from stones and boulders in high mountain river, located at an altitude of 2244 m, at a flow rate of 0.4–0.9 m /s, with water temperatures ca 4.8°C.

Distribution. Known only from the type locality—Zagros Mountains in Iran ( Fig. 76 ).

Figures

FIGURES 37–44. Males of Diamesa zagrosica sp. nov. (37, 41), D. sakartvella Kownacki et Kownacka (38, 42) and D. moubayedi sp. nov. (39–40, 43–44). 37, head; 38, 41, hypopygium in dorsal view; 40, hypopygium in dorsal view without tergite IX; 42, wing; 43, tergite IX; 44, anal point in lateral view.

FIGURES 45–57. Some details of male’s hypopygium of Diamesa sakartvella Kownacki et Kownacka (45, 50–51, 57), D. moubayedi sp. nov. (46–47, 52, 55), D. zagrosica sp. nov. (48–49, 53–54, 56). 45–49, gonostylus; 46, apex of gonostylus; 50–54, transverse sternapodeme; 55–57, superior volsellae.

FIGURES 75–78. Type localities of Diamesa moubayedi sp. nov. (75), Diamesa zagrosica sp. nov. (76), D. steinboecki Goetghebuer (77) and D. praecipua Saether et Willassen (78). 75, glacial karstic spring, Sannyn Mount, alt. 2000 m a. sea l., Central Lebanon (photo by J. Moubayed); 76, Dare Daei River, Zagros Mountains, alt. 2244 m a. sea l., Lorestan Province, Iran (photo by D.M. Palatov); 77, Muttbach Stream, Valais Canton, Swiss Alps (photo by Jean–Louis Lods); 78, Rishi Ganga River, right tributary of the Alaknanda River near town of Badrinath, alt. 3128 m a. s. l., Himalayas, India (photo by D.M. Palatov).