Drymeia vockerothi, 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 vockerothi sp. nov. Figs 1D , 2F , 4C , 6C , 19 , 20 , 21

Type material.

Holotype male labelled "Rigaud, QUE./ 11. VI. 1981 / J. R. Vockeroth"; "Summit of/ Mt. Rigaud"; " CNC 91243 "; " HOLOTYPE / Drymeia vockerothi ♂ / Savage & Sorokina [red]" ( CNC). Paratypes: all with " PARATYPE / Drymeia vockerothi / Savage & Sorokina [yellow]" ( CNC unless otherwise indicated): 4 males same as holotype. 1 male same as holotype except ( BUIC). 1 pair in copula and 1 male labelled "QUE Cté Vaudreuil [currently MRC Vaudreuil-Soulange]/ summit Mt Rigaud / 6.VIII.1992 / D. M. Wood 220m " ( SZMN) . 1 male labelled " QUEBEC, Summit / Rigaud Mtn. / 2. VI.1981 / D. M. Wood " . 1 male labelled "QUE., Rigaud / Summit Mtn. / 18. VI.1986 / H.C. Walther " . 3 males labelled " Masham Twp. [currently La Pêche], QUE./ Gatineau Co. / 10-20 VII.1974 / D. M. Wood " . 1 male same as previous except 28-31.VII.1974. 2 males same as previous except 27-31. V.1974. 1 male same as previous except 22-26. VI.1974. 1 male same as previous except 20-24. V.1974. 1 male same as previous except 25-31.VII.1974. 1 male same as previous except 1-5.VII.1974. 1 male same as previous except 6-8.VII.1974.1 female labelled " Summit King Mt. / Old Chelsea QUE/ 1150' 24.VIII.67/ J. R. Vockeroth" ( BUIC) . 1 male labelled "SH58; June 27/65/ St Hilaire/ P.Q. Canada " [collector unknown] . 1 female labelled " Duncan Lake,/ Nr Rupert, Que / 31.VII.1971 / J.F. McAlpine " . 1 female labelled "Kouchibouguac N. P./ N. B. 12.VII.1978 / S.J. Miller/ Code-7267M" . 1 female labelled "2.Mi.N./ Metcalfe, Ont. / 28. VI.1982 / B.E. Cooper " . 1 male labelled " Metcalfe , ONT./ 2.VIII.1984 / B.E. Cooper " . 1 male, same as previous except 24.VII.1984.1 female labelled " Maynooth ONT./ 10 VII.1965 / J.F. McAlpine " .

Etymology.

The species name is a patronym in honour of famous dipterologist John R. Vokeroth ( Canada), who collected the holotype and several paratypes and designated these specimens as a "new species near D. neoborealis " .

Diagnosis.

Large glossy black species with short proboscis, very narrow parafacial in lateral view, arista almost bare, prealar weak or absent, 2+3 or 4 dc and well developed presutural acr. Males with narrow frons (Fig. 19B ), F2 with at most a few long av near base and with ventral apical process of T 3 short but distinct (Fig. 19C ). This species is similar to Drymeia neoborealis (Snyder, 1949) but can be distinguished from it in both sexes by the presence of strong presutural acr and a narrow parafacial in lateral view.

Male. Body length: 7.2-9.5 mm; wing length: 6.0- 6.7 mm (Fig. 19A ).

Head: Ground colour black; eye bare; fronto-orbital plate and parafacial yellowish silver pruinose; face grey, gena and lower occiput grey pruinose; frons at narrowest point 1.5-2.5 × width of anterior ocellus with fronto-orbital plates touching or nearly touching (Fig. 19B ); parafacial very narrow in lateral view, <1/2 × width of first flagellomere along full length; 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; 14-16 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 broad with prementum shorter than palpus, mostly undusted and glossy; labella large and fleshy.

Thorax: Ground colour black; scutum, postpronotum, notopleuron, postalar callus, pleuron and scutellum black and shiny, mostly undusted; large undusted glossy patches on anterior part of katepisternum and ventral area of meron; anepimeron and katepimeron bare; notopleuron densely setulose; acr 2 or 3+4 or 5, stronger than ground setulae and with preapical series at least as long as preapical dc; 2+4 dc; prealar weak or absent, always much shorter than 2nd notopleural.

Legs: Black; T 1 with 1 or 2 pv; F2 straight, slightly flattened anterodorsally, with 3 or 4 long delicate upcurved av on basal 1/3 and short setae on remaining av surface (Fig. 19D ), 2 or 3 preapical pd-p, and a row of fine dense pv; T 2 without av, 5-7 pd and 2 or 3 pv; F3 with av row stronger and longer than width of femur on apical 1/2, without pv; T 3 clothed on most surfaces with short erect setae, 4-6 pd of irregular length on basal 1/2 and occasionally 2 or 3 short pd on apical 1/2, ventral apical process short but distinct, apical pv absent (Fig. 19C ).

Wing: Light brownish, yellow at base; basicosta and tegula black; costal spinules weak and costal spine reduced; calypters with membrane and edges yellow.

Abdomen: Conical, ground colour black; densely grey dusted with narrow black median vittae on tergites II-V; sternite I bare; sternite V as in Fig. 20C .

Terminalia: Fig. 20A, B .

Female. Body length: 7.5-9.0 mm; wing length: 6.2-6.8 mm (Fig. 21A ).

Differs from the male as follows:

Head: Ground colour black with grey dusting; frontal vitta brown with grey dusting; frontal triangle indistinct, ocellar triangle undusted and shiny; parafacial entirely dusted, without shiny patch near base of antenna; frons at midpoint 0.36 × as wide as head and approximately 0.85 × as long as wide; fronto-orbital plate wide, at midpoint 0.4 × as wide as frontal vitta; seven medioclinate frontal setae (including several interstitials), three orbital setae, the upper two reclinate and lateroclinate, the lower one proclinate.

Thorax: Ground colour as in male but with light grey dusting (Fig. 21B ); acr as in male but often in irregular row.

Legs (chaetotaxy described in full): T 1 with 1 or 2 pv; F2 not flattened anteroventrally, with 2 or 3 short av, 2 or 3 short v on basal 1/3, and with a few short fine pv on apical 1/3; T 2 with 1 or 2 ad, 3-5 pd and 1 or 2 pv; F3 with av row stronger on apical 1/2, without pv; T 3 with 3 or 4 short av, 3 or 4 ad, and 3-6 pd, apical pv absent.

Wing: As in male.

Abdomen: Without distinct median vittae.

Distribution.

Nearctic: Canada (New Brunswick, Ontario, Quebec) .

DNA Barcode.

None available.

Figures

Figure 1. Male frons, frontal view A D. ponti B D. aterrima C D. neoborealis D D. vockerothi. Scale bars: 0.5 mm.

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 4. Male head, lateral view A D. pribilofensis B D. neoborealis C D. vockerothi D D. spinitarsis E D. glacialis F D. santamonicae G D. amnicola H D. minor. Scale bars: 0.5 mm.

Figure 6. Male mid femur, anterior view (except G, H, L) A D. cantabrigensis B D. setibasis C D. vockerothi D D. profrontalis E D. glacialis F D. quadrisetosa G D. santamonicae, antero-dorsal view H D. amnicola, postero-dorsal view I D. similis J D. amnicola K D. hucketti L D. aldrichi, ventral view. Scale bars: 0.25 mm.

Figure 19. Drymeia vockerothi sp. nov. A holotype habitus B male head, frontal view C male hind tibia D male mid femur, anterior view. Scale bars: 1 mm (A, B) 0.5 mm (C, D).

Figure 20. Drymeia vockerothi sp. nov. A male terminalia, lateral view B posterior view C sternite V.

Figure 21. Drymeia vockerothi sp. nov. A female habitus, paratype B female, dorso-lateral view. Scale bars: 1 mm.