Monodiamesa bathyphila (Kieffer)

Makarchenko, Eugenyi A. & Semenchenko, Alexander A., 2023, Review of subfamily Prodiamesinae (Diptera: Chironomidae) from the Russian Far East and bordering territory, Zootaxa 5323 (1), pp. 1-26 : 5

Monodiamesa bathyphila (Kieffer)

( Figs. 3, 5, 7 )

Prodiamesa bathyphila Kieffer, 1918: 102 ; Thienemann 1919: 210, 214. Tshernovskij 1949: 107; Pankratova 1970: 109;

Prodiamesa chuzenigra Sasa, 1989:151 .

Prodiamesa kamidefea Sasa et Hirabayashi, 1993: 379 .

Monodiamesa bathyphila (Kieffer) ; Goetghebuer 1939: 3; Pagast 1947: 501; Brundin 1952: 48; Saether 1973: 675; Pinder 1978: 45; Makarchenko 1985: 102, 2006: 279, 480, 622; Langton & Pinder 2007: 62; Ashe & O’Connor 2009: 323.

Material examined. Russia: 2 adult males, Russian Far East, Chukotka Autonomous Okrug, Anadyr District , Seutakan Lake , 48.645945 N, 131.622981 E, 13.07.1976, 24.07.1976, leg. E. Makarchenko ; 2 adult males, Republic of Sakha (Yakutia), Momsky district , Bolshoy Darpir Lake , 64.188542 N, 148.044258 E, 5.08.2018, leg. E. Khamenkova ; 1 adult male, Republic of Sakha (Yakutia), Momsky district , Malyi Darpir Lake , 64.072464 N, 148.039544 E, 8.08.2018, leg. E. Khamenkova ; 2 adult males, Magadan Region, Susumansky District, Malyk Lake , 63.488711 N, 147.852803 E, 26.07.2020, leg. Е. Khamenkova.

Comments. Some variation is added based on the males from the Russian Far East.

Description

Adult male (n = 5). Total length 5.2–6.8 mm. Total length/wing length 1.22–1.37.

Coloration. Head, thorax, legs, and abdomen brown to dark brown; antennae brown; wings grayish.

Head. Eyes bare, with long parallel-sided dorsomedial extention. Temporal setae including 4 coronals, 8–10 preoculars, 8 verticals. Clypeus round-rectangular, with 6–9 setae. Antenna with 13 flagellomeres and developed plume; terminal flagellomere without subapical setae; AR 2.5–3.34. Palpomeres lengths (in μm): 60–68; 78–92; 135–154; 139–160; 164–210. Palpomeres 1–5 length/head width 0.64–0.98.

Thorax.Antepronotum with 4–16 lateral setae.Acrostichals absent, dorsocentrals 14–22, prealars 5–8, scutellars 26–32.

Wing. Length 4.1–4.72 mm, width 0.9–1.28 mm. R and R 1 with 9–15; R 4+5 with 0–5 seta in distal part. RM length/MCu length 1.0–2.0. Anal lobe developed, outline rounded. Squama with 26–47 setae; VR 0.94.

Legs. Spur of fore tibia 112–124 μm long; spurs of mid tibia 88–104 μm and 82–104 μm; of hind tibia 104–124 μm and 68–96 μm long. Hind tibial comb absent or not separate from other setae. Lengths and proportions of leg segments as in Table 3 .

Hypopygium ( Figs. 3, 5, 7 ). Tergite IX with 33–39 setae, 20–28 μm long and anal point 56–92 μm long, which with apical seta 20–28 μm long; 6 setae located in basal part of anal point. Laterosternite IX with 11 setae. Gonostylus 176–200 μm long, covered with short setae, megaseta 16–20 μm long and 1–2 setae nearest, 20–24 μm long. Gonocoxite 432–541 μm long, shape of superior and inferior volsellae as in Figs. 3, 5, 7 . Length of superior volsella 40–60 μm, inferior volsella 72–92 μm. Median volsella on pedestal, 60–112 μm long, in basal part with 3–4 setae. HR 2.45–2.71.

Pupa and larva described in detail by Thienemann (1919), Pagast (1947), Tshernovskij (1949), Pankratova (1970), Saether (1973) and Makarchenko (1985). Larva can be separated from M. fontinalis sp. nov. only by molecular data.

Distribution. Holarctic arctoalpine species, lives in oligo- and mesotrophic lakes ( Saether 1979).

Figures

FIGURES 1–7.Adult males of Monodiamesa fontinalis sp. nov. (1–2, 4, 6) and M.bathyphila Kieffer (3, 5, 7). 1, 3, hypopygium in dorsal view; 2, hypopygium in ventral view; 4–7, median volsellae. Scale bar is 50 μm.