Drymeia woodorum, Savage & Sorokina, 2021

Savage, Jade & Sorokina, Vera S., 2021, Review of the North American fauna of Drymeia Meigen (Diptera, Muscidae) and evaluation of DNA barcodes for species-level identification in the genus, ZooKeys 1024, pp. 31-89 : 31

Drymeia woodorum sp. nov. Figs 2J , 22 , 23 , 24

Type material.

Holotype male labelled "MI. 87, Y. T./ Depmster Hwy./ 4-8.VIII.1973 / G. & D. M Wood"; " HOLOTYPE / Drymeia woodorum ♂ / Savage & Sorokina [red]" ( CNC). Paratypes: all with " PARATYPE / Drymeia woodorum / Savage & Sorokina [yellow]" ( CNC unless otherwise indicated): 1 female labelled " Swim Lakes , Y. T./ 133°, 62°13'/ 3200' 25. VI.60/ J.E.H. Martin " . 1 female, same as previous except 12.VII.60 and ( BUIC) . 1 female labelled " La Force L., Y. T./ 132°20', 62°30'/ 3300' 10.VII.60/ J.E.H. Martin " . 1 female labelled " La Force L., Y. T./ 132°20', 62°41'/ 3300' 29. VI.60/ J.E.H. Martin " . 1 female, same as previous except 5.VII.60. 1 female, same as previous except 10.VII.60. 2 females, same as previous except 13.VII.60. 2 females labelled " La Force L., Y. T./ 132°20', 62°41' / 3300' 25. VI.60/ E.W. Rockburne " . 1 female, same as previous except 26. VI .60. 1 female, same as previous except 11.VII.60. 1 female, same as previous except 12.VII.60. 1 female, same as previous except 12.VII.60 and ( BUIC) . 1 female labelled " Whitehorse , Y. T./ 29/VIII 1949 / L.C. Curtis " .

Etymology.

The species name is a patronym in honour of the late Canadian dipterologist D. Monty Wood and his wife Grace Wood ( Canada), who collected the holotype .

Diagnosis.

Small grey species with short proboscis, narrow frons and narrow parafacial in lateral view (Fig. 22A ), arista almost bare, prealar absent in male and weak in female, 2+4 dc and well developed presutural acr. Male with patch of four or five very long, strong apical bristles on fore coxa and with a row of ad on apical 2/3 of T 2. This species is similar to Drymeia neoborealis and Drymeia vockerothi sp. nov. but can be distinguished from them in both sexes by the smaller size, in the male by the bristles of the fore coxa and T 2, and in the female by the combination of strong presutual acr, completely dusted prementum, and parafacial in lateral view nearly as wide as width of first flagellomere.

Description.

Male. Body length: 5.5 mm wing length: 4.5 mm.

Head: Ground colour black; eye bare; ocellar triangle, fronto-orbital plate and parafacial silvery pruinose; face grey, gena and lower occiput light grey pruinose; fronto-orbital plates touching in the middle; frons at narrowest point as wide as width of anterior ocellus; parafacial very narrow in lateral view, <1/2 width of first flagellomere along full length (Fig. 22A ); lower margin of the face equal to or slightly behind lower level of profrons in lateral view; gena at narrowest point 0.5 × length of first flagellomere, densely setulose and with a group of upcurved setae on anterior part of genal dilation; 12 frontal setae (including interstitials) reaching almost to anterior ocellus; antenna black; first flagellomere 1.3 × as long as wide; arista swollen near base and almost bare, with longest hair much shorter than basal diameter of arista; palpus black; proboscis short, with prementum shorter than palpus and heavily dusted; labella large and fleshy.

Thorax: Ground colour black; scutum without distinct vittae; postpronotum, notopleuron and postalar callus with dense brown dusting; pleuron brownish grey dusted; undusted glossy patches on most anterior part of katepisternum and on a small ventral area of meron; anepimeron and katepimeron bare; notopleuron densely setulose; acr 2 or 3 + 4 or 5 (+1 prescutellar), stronger and longer than ground setulae (and with preapical series at least as long as preapical dc); 2 or 3+4 dc; prealar absent.

Legs: Black; fore coxa with patch of four or five very long, strong apical bristles, at least as long as length of coxa; T 1 with 1 or 2 pv; F2 with a row of short av on apical 1/3, 5 or 6 a on basal 1/2, these longer than width of femur, 3 preapical pd-p, and dense fine pv over most of the surface; T 2 without av, with a row of ad on apical 2/3, these longer near apex, 4 pd and 2 pv; F3 with av row stronger on apical 1/3, without pv except for a few hairs near base; T 3 with 3 av, 3 long ad, a row each of short erect uneven a and ad, 2 long and 2 or 3 short pd, ventral apical process very short but distinct, apical pv absent (Fig. 22B ).

Wing: Mostly dark brown; basicosta and tegula black; costa with short weak spinules and costal spine reduced; calypters with membrane and edges deep yellow.

Abdomen: Conical, ground colour black; densely grey dusted with a black median vitta on tergites II-V; sternite I bare; sternite V as in Fig. 23B .

Terminalia: Fig. 23A, B .

Female. Body length: 4.9-5.5 mm wing length: 4.3-4.7 mm (Fig. 24A ). Differs from the male as follows:

Head: Ground colour grey with grey dusting; frontal vitta black with brownish dust; frontal triangle indistinct, ocellar triangle covered with heavy grey or brown dust; parafacial completely dusted but with large area near base of antenna appearing velvety brown in anterior and lateral views (Fig. 24B, C ); frons at midpoint approximately 0.4 × as wide as head and approximately 0.75 × as long as wide; fronto-orbital plate narrow, at midpoint 0.16-0.2 × as wide as frontal vitta; gena approximately as high as length of first flagellomere; five or six medioclinate frontal setae (including interstitials), three orbital setae, the upper two reclinate and lateroclinate, the lower one proclinate.

Thorax: Scutum with whitish grey dust and, when viewed from the front, with 3 brown vittae with diffuse margins (Fig. 24B ); postpronotum, notopleuron, postalar lobe and pleuron grey dusted; acr as in male but with slightly uneven rows; prealar distinct but weak in all females from the type series, always much shorter than 2nd notopleural.

Legs (chaetotaxy described in full): Fore coxa without patch of long strong bristles; T 1 with 1 or 2 pv; F2 with a row of short av, no longer than width of femur and a row of delicate pv-v, no longer than diameter of femur; T 2 usually with a row of 5-7 irregular pd, (these sometimes reduced) and 1 pv; F3 with av row stronger on apical 1/3, without pv except for a few hairs near base, T 3 with 2-3 av, 5-6 short irregular ad and 5-6 pd, apical pv usually absent but if visible, then no longer than 1/2 the length of apical av.

Wing: Clear with slight pale brown to pale yellow tinge, veins pale brown; calypters whitish.

Abdomen: Densely whitish grey dusted with slight brownish tinge along posterior margins of tergites II-IV.

Distribution.

Nearctic: Canada (Yukon Territory).

DNA Barcode.

None available.

Remarks.

See notes on problematic taxa.

Figures

Figure 2. Male hind tibia, dorsal view A D. ponti B D. aterrima C D. groenlandica D D. setibasis E D. similis F D. vockerothi G D. quadrisetosa H D. glacialis I D. hucketti J D. woodorum. Scale bars: 0.5 mm.

Figure 22. Drymeia woodorum sp. nov. A holotype habitus B male hind tibia. Scale bars: 1 mm (A); 0.25 mm (B).

Figure 23. Drymeia woodorum sp. nov.: male terminalia A lateral view B posterior view C sternite V.

Figure 24. Drymeia woodorum sp. nov. A female habitus, paratype B female frons and scutum, dorsal view C female, dorso-lateral view. Scale bars: 1 mm (A); 0.5 mm (B, C).