Drymeia taymirensis, 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 : 196-199

Drymeia taymirensis sp. nov.

Figs. 19 A–H

Diagnosis. The species is very similar to D. brumalis ( Rondani, 1866) . The new species can be distinguished as follows: anepimeron and katepimeron bare; prealar long and strong; eye bare; facial edge projecting a little forward beyond the level of profrons; proboscis elongated, slender; fronto-orbital plates in male separated by a narrow frontal vitta; mid and hind femora in male with rows of fine dense anteroventral, ventral and posteroventral setae; hind tibia in male with a small ventral apical prong, without or with short posteroventral apical seta; abdomen deep brownish-grey dust except for black marks on tergites 3–5, in female abdomen black, shining.

Etymology. The species name is based on the type-locality, the Taymyr Peninsula.

Type material examined. Holotype male, RUSSIA: Krasnoyarsky Krai, Taymyr Peninsula, 90 km NW Khatanga, valley of Zakharova-Rasokha River (left tributary of Novaya River), 72.7ºN 101.08ºE, 10.vii.2011, A. Barkalov ( SZMN).

Paratypes: 2 males and 1 female, same data as holotype, 3–10.vii.2001, A. Barkalov & V. Zinchenko ( SZMN). Kamchatskii Krai: Olyutorskii raion [as Koryakskiy NO], 6 males and 2 females, environs Apuka, ~ 60°27'N 169°34'E, Pakhachinskiy range, 3 & 7.vii.1959, K. Gorodkov. Chukotka Autonomous Okrug: Chaunskii raion, 1 male, environs of Pevek [as Val’kumey], ~ 69°36'N 170°11'E, 12.vii.1963, Gorodkov; 3 males and 3 females, Pevek, ~ 69°42'N 170°19'E, 28,30.vi.1963, 3.vii.1963, 29.vii.1963, Gorodkov; 3 males, 110 km SE Pevek, ~ 69°08'N 172°45'E [as Komsomol’skii], valley of Ichuviev River, 5.vii.1963, Gorodkov; 1 male, 67 km SE Pevek, ~ 69°32'N 172°00'E [as Krasnoarmeiskii], 10.vii.1963, Gorodkov; Iultinskii raion: 1 male and 1 female, ~ 67°52'N 178°43'E [as Iultin], 20.vii.1963, Gorodkov; 3 males, ~ 67°42'N 178°35'E [as 20 km SSE Iultin], valley of Amguema River, 22.vii.1963, Gorodkov; 3 males, 5 км N Egvekinot, ~ 66°22'N 179°07'E, on Oasiphora fruticosa , 26,27. vii.1963, Gorodkov; 3 males and 1 female, 55 km N Egvekinot, river valley, 29.vii.1963, Gorodkov.

All the above paratypes from Chukotskiy AO collected by K. Gorodkov are located in the ZIN except for 2 pairs deposited in the SZMN.

Description. MALE. Length of body, 5.0– 5.8 mm. Length of wing, 4.0– 4.5 mm.

Head: Ground-colour black. Eye bare. Fronto-orbital plate and parafacial silvery-grey pruinose; face grey, gena and lower occiput light grey pruinose. Fronto-orbital plates separated by a narrow frontal vitta. Frons at narrowest point 2.5 times as wide as diameter of anterior ocellus (rarely 3–3.5 times). Ocellar setae short. 11–14 pairs of frontal setae, including interstitials, reaching almost to anterior ocellus. Antenna black, postpedicel circa 1.3 times as long as wide. Arista swollen in basal sixth, appearing almost bare, the longest hairs shorter than basal diameter of arista. Parafacial at level of insertion of arista slightly broader than width of postpedicel, hardly narrowing below. Upper part of face without a distinct carina between antennal bases. In lateral view, facial edge projecting a little forward beyond the level of profrons. Gena broad, depth below lowest eye-margin equal to or slightly broader than length of postpedicel, densely setose and with a group of upcurved setae on anterior part of genal dilation. Palpus black. Proboscis elongated, slender. Prementum of proboscis as long as palpus, shining, with very light dust in middle.

Thorax: Ground-colour black. Scutum black, subshining, viewed from in front with brown dust, without distinct longitudinal vittae, but sometimes with indistinct undusted lines along the postsutural dorsocentral and acrostichal lines; postpronotal lobe, notopleuron and postalar callus the same as the scutum. Ground-setulae short. Pleura subshining, light brownish dusted, without a shining patch anteriorly on katepisternum and medially on meron. Anepimeron and katepimeron bare. Notopleuron densely setulose. Prosternum bare. Acrostichals 0+1. Dorsocentrals 2+4. Prealar long and strong. Katepisternal setae 1+1. Scutellum black, shining in posterior view.

Legs: Black. Fore tibia with 3–5 posteroventral setae on apical half (sometimes with 1–3 fine posterodorsals). Fore tarsomeres 1–4 each with a short fine anteroventral and posteroventral hair at tip, fore tarsomere 1 without posteroventrals at apex. Fore claws as long as length of tarsomere 5, thin and pointed, but often short, blunt and obviously broken, shorter than length of tarsomere 5. Pulvilli as long as tarsomere 5. Mid femur straight, slightly flattened, with rows of fine dense anteroventral, ventral and posteroventral setae; 2 short anterior and 3 posterodorsal to posterior preapical setae. Mid tibia with 2 anterodorsal (sometimes with an additional 2 short) setae and without anteroventrals; 5–6 posterodorsals, 3–4 posteroventrals and often with 2–3 posterior. Hind femur with long dense setae on anteroventral, posteroventral and ventral surfaces, the setae on apical third of anteroventral surface strong. Hind tibia with a row of long and short setae between the posterodorsals; with a row of uneven anterodorsals; with numerous fine and short setae on anteroventral, anterior, posterior and posteroventral surfaces; with a small ventral apical prong, without or with a short posteroventral apical seta and strong anteroventral seta, without other strong preapical setae. Hind tarsomere 1 with 1 short ventral seta at base.

Wing: Brownish, darker 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 triangular spot on tergite 3 and a smaller triangular spot on tergite 4, with a median vitta on tergite 5. Sternite 1 bare. Sternite 5 a little swollen ( Fig. 19 D).

Terminalia : Figs 19 E–H.

FEMALE. Length of body, 5.4–6.4 mm. Length of wing, 4.7–5.5 mm.

Differs from the male as follows:

Head: Dichoptic. Frons at middle 0.33 of head-width at this point, and at this point each fronto-orbital plate 0.5 of frontal vitta. Head brown dusted. Frontal triangle subshining, not or hardly reaching the crossed setae on frontal vitta. Ocellar setae strong. 5–6 pairs of inclinate frontal setae, including several interstitials; 3 pairs of orbital setae, the upper two pairs reclinate and exclinate, the lower pair proclinate and exclinate. Frontal vitta with a pair of strong crossed setae.

Thorax: As in the male.

Legs: Black. Fore tibia with 2–3 posteroventral setae on apical half. All claws and pulvilli much shorter. Mid femur straight, anteroventral surface with 1–2 strong setae on basal quarter and several short strong setae on apical third; posteroventral surface with a row of short fine setae. Mid tibia with 3–4 anterodorsals, 0 anteroventrals, 5–6 posterodorsals, and 2–4 posteroventrals. Hind femur with a row of short fine posteroventral setae and a row of strong anteroventrals which are shorter and fine on basal third. Hind tibia with 5–6 long posterodorsals on middle part, 4–5 short anteroventrals, and 3–4 strong and several short anterodorsals; with strong apical setae on anterior and ventral surfaces.

Wing: Yellowish-brown tinged, dark yellow at base.

Abdomen: Black, shining, without any dusted marks.

Ovipositor: Figs 19 I, K.

Distribution. Russia: Taymyr Peninsula, Kamchatka, Chukotka.

Figures

FIGURE 19. Drymeia taymirensis (paratypes). A. Male habitus, lateral view. B. Male head, anterior view. C. Male abdomen, dorsal view. D. Sternite 5. E – H. Male terminalia. E, F. Lateral view (variation of the shape of the surstyli). G. Postero-lateral view. H. Posterior view. I, K. Female, apical portion of ovipositor. I. Ventral view. K. Dorsal view.