Drymeia triseta, Sorokina, Vera S. & Pont, Adrian C., 2015

Sorokina, Vera S. & Pont, Adrian C., 2015, A review of the genus Drymeia Meigen, 1826 (Diptera: Muscidae) in Russia, Zootaxa 4000 (2), pp. 151-206 : 200-202

Drymeia triseta sp. nov.

Figs. 20 A–G, 21 A–D

Diagnosis. The species is very similar to D. firthiana (Huckett, 1965) . The new species can be distinguished as follows: anepimeron and katepimeron bare; prealar seta long and strong; proboscis thin, elongate; eye bare; mid femur in male with a row of uniform anteroventral setae, and with very long posteroventrals on basal 2/3 which are 2–2.5 times as long as depth of femur; mid tibia with 2 anterodorsals; hind femur without posteroventral setae; hind tibia in male with a small ventral apical prong and a short apical posteroventral seta; abdomen brownish-grey dusted, in male with a large black trapeziform or rectangular spot on tergite 3 and a median vitta on tergites 4–5.

Etymology. The species name refers to the three postsutural dorsocentral setae on the scutum.

Type material examined. Holotype male, RUSSIA: Altai Republic, Kosh-Agach raion, south slope of Kurayskii range, 7 km NW Kuray, 2251 m, 50º17'N 87º51'E, 17.vii.2013, V. Sorokina ( SZMN).

Paratypes: Altai Republic, Turochakskii raion: 1 male, environs of Teletskoe lake, 1750 m, 15.vii.1987, A. Barkalov; Shebalinskii raion: 11 male, 10 km NE Verkh-Kokuya Pass, 842 m, 51.49ºN 85.42ºЕ, 26.vi.2009, V. Sorokina & A.C. Pont (10 males and 8 females, half BMNH & OUMNH); 14 males, mouth of Sarlyk River, 1252 m, 51.12ºN 85.60ºЕ, 30.vi.2009, V. Sorokina & A.C. Pont (9 males in BMNH & OUMNH); 2 females, River Peschanka, 840 m, 51°39'N 86°16'E, 26.vi.2009, A.C. Pont ( BMNH & OUMNH); 5 males and 2 females, environs of Il’inka, Gladkikh Mt., 1308 m, 51°27'N 85°07'Е, 19.vii.2011, V. Sorokina; 2 males and 2 females, environs of Belok-Mukhor-Cherga Mt., 1767–1854 m, 51°19'N 85°18'E, 22.vii.2011, V. Sorokina; 1 male, D’ektirek, River Gorduba, 957 m, 51°28'N 86°61'E, 27.vii.2009, A.C. Pont ( OUMNH); Altai Republic, Ulaganskii raion: 1 male, 10 km SW Altash, Severo-Chuyskii range, 2200–2400 m, 16.vii.2003, A. Barkalov; 17 males 1 female, environs of Dzhulukul’ lake, 2200 m, 50.47ºN 89.77ºЕ, 21.vii.2007, V. Sorokina; 6 males, Shapshalskii range, 2878 m, 50.53ºN 89.8ºE, 24.vii.2007, V. Sorokina; 8 males and 1 female, Kurayskii range, 2450–2800 m, 50.33'N 87.75ºЕ, 29–30.vi.2008, 2,3. vii.2008, A. Barkalov; Altai Republic, Kosh-Agachskii raion: 17 males and 2 females, upper part of Zhumaly River, Rodonovyi spring, 2412 m, 49°27'N 88°03'E, 24.vi.2005, V. Sorokina, 4.vii.2005, 23.vii.2006, T. Novgorodova; 19 males and 3 females, south slope of Yuzhno-Chuyskii range, valley of Tara River, 2175–2200 m, 49°39'N 88°13'E, 30.vi.2006, 1–4.vii.2006, V. Sorokina & T. Novgorodova, 11.vii.2009, V. Sorokina; 44 males and 16 females, 18 km SE Dzhazator, 2115 m, 49°37'N 87°39'E, 5.vii.2006, V. Sorokina; 14 males and 3 females, Ukok plateau, 8 km NE Maitobe Mt., 2420–2800 m, 49°34'N 87°43'E, 6–10.vii.2006, V. Sorokina & T. Novgorodova; 5 males and 2 females, Ukok plateau, valley of Ak-Allacha River, 2160 m, 49°25'N 87°37'E, 12–14.vii.2006, V. Sorokina & T. Novgorodova (3 males in OUMNH); 3 males, Ukok plateau, environs of Kal’dzhin-Kul’-Bas lake, 2400–2800 m, 49°19'N 87°26'E, 17,18. vii.2006, V. Sorokina & T. Novgorodova; 1 male, Ukok plateau, environs of Muzdy-Bulak lake 2400 m, 49.28ºN 87.65ºЕ, 12.vii.2008, A. Barkalov; 12 males and 1 female, upper part of Naryn-Gol River, 2520 m, 49º49'N 88º13'Е, 15–19.vii.2009, V. Sorokina & T. Novgorodova; 34 males and 7 females, south slope of Kurayskii range, 7 km NW Kuray, 2251–2588 m, 50º18'N 87º51'E, 17–19.vii.2013, V. Sorokina; 7 males and 2 females, north slope of Severo-Chuyskii range, valley of Akturu River, 2014–2064 m, 50º06'N 87º48'E, 21.vii.2013, V. Sorokina; Altai Republic, Ust’-Koksinskii raion: 27 males and 5 females, Nizhne-Mul’tinskoe lake, 1633 m, 50º01'N 85º49'E, 13.vii.2013, V. Sorokina; 1 male, north slope of Katunskiy range, 2272 m, 13 km S Mul’ta, 50º04'N 85º57'E, 14.vii.2013, V. Sorokina; 1 male, Katunskiy reserve, between Oroktoy River and Tukman River, 1009–1940 m, 50º05'N 86º32'Е, 28.vi.2007, O. Kosterin ( ZMUM); 2 males, between Oroktoy River and Akkem River, 1009 м, 50º06'N 86º28'Е, 4–8.vii.2007, O. Kosterin ( ZMUM). Krasnoyarsky Krai: 7 males, Sayany Mts, Kryzhina Mt., upper part of Bely Kitat, 1350–1400 m, 53.99ºN 95.43ºЕ, 13–16.vii.2009, R. Dudko & Shevelev. Khakasiya: 4 males and 4 females, Shirinskii raion, Shira-Itkul’ lake env., 54.45ºN 90.18ºE, tophill Betuletum, 25–28.vi.2011, K. Tomkovich ( ZMUM). Tyva Republic, Morgun-Taiginskii kozhuun: 9 males, environs of Mugur-Aksy, 2000–2100 m, ~ 50º22'N 90º25'E, 22.vii.1993, A. Barkalov; 3 males and 1 female, Shapshalskii range, upper part of Shui River, 2550–2900 m, 50.53ºN 89.8ºE, 25.vii.2007, V. Sorokina; 5 males and 3 females, east bank of Khindiktig-Khol’ lake, 2334, 50.4ºN 89.9ºE, 28.vii.2007, A. Barkalov. MONGOLIA: 1 male, Khubsugulskii aimak, 25 км SSW Murena, 23.vii.1975, E. Narchuk ( ZIN).

All the above paratypes are located in the SZNM, OUMNH and BMNH except for 3 pairs from Altai Republic deposited in each of the following: ZIN, ZMUM, BUIC.

Description. MALE. Length of body, 3.8–6.3 mm. Length of wing, 3.7–4.6 mm.

Head: Ground-colour black. Eye bare. Fronto-orbital plate brownish-grey pruinose, parafacial grey-silver pruinose; face grey, gena and lower occiput brownish-grey pruinose. Fronto-orbital plates touching. Frons at narrowest point 1.5 times as wide as diameter of anterior ocellus. Ocellar setae short. 12–15 pairs of frontal setae, including interstitials, reaching to anterior ocellus. Antenna black, postpedicel circa 1.5 times as long as wide. Arista swollen in basal sixth, pubescent, the longest hairs slightly longer than basal diameter of arista. Parafacial at level of insertion of arista as wide as or slightly wider than width of postpedicel, narrowing below. Upper part of face with a small carina between antennal bases. In lateral view, facial edge a little projecting forward beyond the level of profrons. Gena broad, depth below lowest eye-margin equal to length of postpedicel, densely setose and with a group of upcurved setae on anterior part of genal dilation. Palpus black. Proboscis thin, elongate. Prementum of proboscis dusted, as long as palpus.

Thorax: Ground-colour black. Scutum matt, black, viewed from in front greenish-bluish-brown dusted, with two brown vittae along dorsocentrals, viewed from behind blackish; postpronotal lobe, notopleuron and postalar callus as scutum. Ground-setulae short. Pleura brownish-grey dusted, with a shining patch anteriorly on katepisternum and medially on meron. Anepimeron and katepimeron bare. Notopleuron setulose. Prosternum bare. Acrostichals 0+1. Dorsocentrals 2+3 (rarely 4 postsutural pairs). Prealar long and strong. Katepisternal setae 1+1(3), if 3 posterior setae present then the two lower ones shorter and weaker. Scutellum shining black in posterior view, with small dusted spots on lateral margins and at tip.

Legs: Black. Fore tibia with 1–3 posteroventral setae on apical half. Fore tarsomeres 1–4 each without fine anteroventral and posteroventral hairs at tip, fore tarsomere 1 without posteroventrals at apex. Fore claws of all males blunt and much shorter then length of tarsomere 5, probably broken. Pulvilli as long as tarsomere 5. Mid femur straight, with a row of uniform anteroventral setae; with a row of posteroventrals which are very long on basal 2/3, longer than 2–2.5 times depth of femur; with 0 anterior and 2(3) posterodorsal to posterior preapical setae. Mid tibia with 2 anterodorsals on apical half, without anteroventrals, 3–4 posterodorsals, 3–4 posteroventrals. Hind femur with a row of anteroventrals, on posteroventral surface at most with a few weak setae at apical 1/4 and posteriorly at base. Hind tibia with rows of long anterodorsals and posterodorsals, with numerous setae on anterior surface, with 4–5 short anteroventrals and 3–4 short hair-like posteroventrals; with a small ventral apical prong and a short posteroventral apical seta. Hind tarsomere 1 with 1 short ventral seta at base.

Wing: Brown, almost black at base. Basicosta and tegula black. Costa with weak spinules, without costal spine. Cross-vein r-m below the point where subcosta enters costa. Cross-vein dm-cu upright, almost straight, forming a right-angle with vein M. Calypters and margins yellow. Knob of haltere black.

Abdomen: Conical; ground-colour black. Viewed from behind, tergites 3–5 deep brownish-grey dusted except for a large black trapeziform or rectangular spot on tergite 3 and a median vitta on tergites 4–5 that becomes narrower towards the tip of abdomen. Sometimes tergite 4 also with a trapeziform or rectangular black spot. Sternite 1 bare or with several setulae. Sternite 5 ( Fig. 20 D).

Terminalia : Figs 20 E–G.

FEMALE. Length of body, 5.1–6.2 mm. Length of wing, 4.1–4.7 mm.

Differs from the male as follows:

Head: Dichoptic. Frons at middle 0.38 of head-width at this point, and at this point each fronto-orbital plate 0.4 of frontal vitta. Frontal triangle visible from above, subshining, not reaching the crossed setae on frontal vitta. Ocellar setae strong. 3–4 pairs of strong inclinate frontal setae and several shorter weak interstitials; 3 pairs of orbital setae, the upper two pairs reclinate and exclinate, the lower pair proclinate and exclinate. Frontal vitta brown, with a pair of strong crossed setae.

Thorax: Scutum brownish dusted, without distinct brown vittae, light greenish tinged.

Legs: Fore tibia with 2–3 posteroventral setae on apical half. All claws and pulvilli much shorter. Mid femur with 1 prebasal and 5–6 apical anteroventrals; with or without 1 or 2 weak posteroventral setae; 0 anterior and 2 posterodorsal to posterior preapical setae. Mid tibia with 2–3 anterodorsals, 0–2 anteroventrals, 2–3 posteroventrals, 3–4 posterodorsals. Hind femur with a complete row of anteroventrals and with 1 or 2 fine hairlike posteroventrals on basal quarter. Hind tibia with 3–4 anterodorsals, 3–4 posterodorsals, 3 anteroventrals.

Wing: Yellowish tinged.

Abdomen: Shining black with brown dust.

Ovipositor: Figs 21 C, D.

Remark. Adults of this species are found on flowering plants.

Distribution. Russia: Altai-Sayan region, Khakasiya. Mongolia.

Figures

FIGURE 20. Drymeia triseta, male. A. Habitus, lateral view. B. Abdomen and scutum, dorsal view. C. Mid femur, dorsal view. D. Sternite 5. E – G. Terminalia. E. Lateral view. F. Postero-lateral view. G. Posterior view.

FIGURE 21. Drymeia triseta, female. A. Habitus, lateral view. B. Head, lateral view. C, D. Apical portion of ovipositor. C. Dorsal view. D. Ventral view.