Isomyia hauwangai Kurahashi and Kirk­Spriggs, 2006

Kurahashi, Hiromu & Kirk-Spriggs, Ashley H., 2006, The Calliphoridae of Namibia (Diptera: Oestroidea), Zootaxa 1322 (1), pp. 1-131 : 36-38

publication ID 10.11646/zootaxa.1322.1.1

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Isomyia hauwangai Kurahashi and Kirk­Spriggs

sp. nov.

Isomyia hauwangai Kurahashi and Kirk­Spriggs , sp. nov.

Figs. 33–38 View FIGURES 33–38 ; 43–44 View FIGURES 43–44 ; 99 View FIGURES 99–104 .

Description: Length: 9.0–10.0 mm. Slender, metallic fly having hyaline wings and blackish legs. ♂ head: sub­holoptic; eyes glabrous, separated at narrowest point of frons by 1.5 x width of ocellar triangle; frons index 0.15 (0.13–0.16, n =4); frontal vitta blackish brown, narrowed medially, but slightly broader than 1.5 x width of anterior ocellus at narrowest point; fronto­orbital plate densely silver­grey dusted, with rather long fine black setulae anteriorly, provided with ca. eight pairs of ori; parafacial broad, subequal to 3 x width of 1 st flagellomere, densely silver­grey dusted, with brownish setulae on anterior half, with glossy black spot on lower ½; facial plate brown, very slightly grey dusted, median carina short, broad, with median longitudinal incisure; facial ridge concolorous with face, bare except for a few black setulae just above vibrissa; mediana broad, reddish brown, silver­grey dusted, bare; vibrissarium narrow, brown, bare, sub­shining; vibrissa strongly developed; lower facial margin projecting forward more than width of 1 st flagellomere, brown, sub­shining; genal dilation largely blackish, except for upper margin below eye somewhat reddish, grey dusted, clothed in black hairs; postgena concolorous with genal dilation, largely clothed in yellowish white hairs, except a few black ones on anterior lower margin; occiput concolorous with gena, clothed in yellowish white hairs; pedicel brownish orange, sub­shining; 1 st flagellomere brownish orange, pubescent, 3 x as long as pedicel; arista yellowish brown, darkened basally, thickened on basal 1/6, long plumose basal on ¾; palpus long, sub­equal to theca, taeniate, yellowish orange, with black strong setulae.

Thorax: metallic green, with bluish tinge in part, snowy­white dusted anteriorly and medially on scutum, with three undusted sub­shining stripes when viewed from behind; postpronotum, postalar callus and scutellum concolorous with scutum; prosternum with rather long yellowish hairs along lateral margins anteriorly; proepisternum bare; katatergite pubescent; some yellow meral hairs present on upper part of kataepimeron close to row of meral bristles; anepisternum clothed in black hairs; anepimeron clothed in fine long yellow hairs, with a few black bristles; katepisternum clothed in fine long yellow hairs on posterior upper part, with black hairs on anterior ventral parts; anterior spiracle fuscous black; posterior one fuscous black; postalar wall bare; tympanic tuft absent; suprasquamal ridge bare; anterior parasquamal tuft absent. Chaetotaxy: ac 1–2+3; dc 2+4; ia 1+3; pprn 3; ph 4; prs 1; sa 3, 1 fine interstitial between 1 st and 2 nd; pa 2; kepst 1+1; sc 3+2, 1 fine additional basal bristle sometimes present; n 2; prepst 2; prepm 2.

Wings: hyaline, very slightly brownish tinged entirely; veins brown; tegulla black; basicosta black; subcostal sclerite yellowish brown, pubescent; node of veins R 2+3 and R 4+5 with a few black setulae below; vein R 4+5 with ca. 5 black setulae on ½ distance from node to crossvein r­m above; vein M 1+2 bent with obtuse angle, section of vein M 1+2 from bend to wing edge nearly sigmoidal, running toward margin; cell r 4+5 open; calypters whitish; lower one longer than broad, bare on upper surface, with white margin and fringe. Halter yellowish brown.

Legs: black, dull metallic blue tinged on fore and mid coxae, more or less grey dusted, blackish haired; fore tibia with row of 4–5 ad on basal ⅔ and 1 p at apical ½; mid tibia with 1 ad and 1 pd at apical ½, with 3–4 p medially; hind tibia with 2 ad, 2 pd and 2–3 av.

Abdomen: entirely metallic green, brassy tinged, rather densely silver­grey dusted, with trace of median longitudinal stripe on tergites 3–4, black haired; syntergite 1+2 with a few lateral marginal bristles and some bristles on lateral sides; 3 rd tergite with several lateral marginals and 1 lateral discal; tergites 4–5 with row of marginal bristles, tergite 4 with 1 lateral discal, 5 th tergite with row of 3–4 lateral discals; sternites black, black haired; hairs on lateral sides of tergites also black.

Postabdomen: normal in size; 6 th tergite dull metallic blue, with small bristles; epandrium bluish tinged, with small bristles and bristly hairs.

Male genitalia as illustrated in Figs. 33–38 View FIGURES 33–38 .

♀ Head: dichoptic; eyes glabrous, frons index 0.30 (n =1); frontal vitta broad, parallelsided, slightly narrowed toward base of pedicel, reddish brown, approximately 2 x width of fronto­orbital plate just in front of anterior ocellus; fronto­orbital plate broad anteriorly, narrowed toward vertex, blackish, densely silver­grey pollinose, large glossy black spot present on anterior ½, very sparsely setulose around ors; ors 2+1; oc strong; acoc absent; pooc indistinct; ov and iv well developed; poc parallel; occ absent. Thorax and wing: similar to those of male. Legs: blackish, but reddish brown in part, especially on tibiae; mid tibia with 1 v., otherwise similar to male. Abdomen: with bluish green tinge, more or less reddish on venter, without trace of median longitudinal stripe, marginal and discal bristles weakly developed, often decumbent; 5 th tergite with row of discal bristles. Ovipositor not dissected.

Differential diagnosis: Genitalic evidence and the presence of bright orange antennae indicate that the new species belongs to the distinguenda ­group of species ( sensu Zumpt 1958a: 12 ). This group includes the described species: I. cuprapex ( Villeneuve, 1917) , I. terminata ( Wiedemann, 1830) , I. distinguenda ( Villeneuve, 1917) , I. darwini ( Curran, 1938) , I. cuthbertsoni ( Curran, 1938) and I. faini Zumpt, 1958a . The new species is similar to I. darwini from Rhodesia [= Zimbabwe], but can be easily distinguished from it by the characteristic male genitalia, having the cerci not fused to one another. The male genitalia of the closely­related I. darwini were illustrated by Zumpt (1958a: 57, fig. 16).

Etymology: The species is named in honour of Walter Hauwanga (Technical Assistant, NMNW), who prepared many of the specimens used in this study.

Bionomics: Adults have been collected in Malaise and pitfall traps and by hand. Nothing is currently known of the larval biology.

Distribution: Namibia.

Type material: Holotype ♂, ‘ Holotype [laser­printed on red card] // Namibia: RUNDU DISTRICT / Hamoye Nat. Forest / 18°12''S 19°43''E / 05–08.iii.1999 / E. Marais / Malaise trap // Isomyia / hauwangai ♂ / sp. nov. / Det. H. Kurahashi [laser­printed on white card with red perimeter]’ (NMNW type # T658). Paratypes: 1♂, same data as holotype, except: ‘ Paratype [laser­printed on yellow card]’; 1♂, ‘ Paratype [laser­printed on yellow card] // Namibia: RUNDU DISTRICT / Sovo Area / 18°18'37''S 19°15'36''E / 21–24.IV.2001 / E. Marais, S. Kasch / By hand // Isomyia / hauwangai ♂ / sp. nov. / Det. H. Kurahashi [laserprinted on white card with blue perimeter]’; 1♂, Paratype [laser­printed on yellow card] // BUSHMANLAND / at: 19°22'S 19°36'E / 08.i.–01.ii.1990 / E. Marais / Pres. pitf. traps // Isomyia / hauwangai ♂ / sp. nov. / Det. H. Kurahashi [laser­printed on white card with blue perimeter]’; 1♂, ‘ Paratype [laser­printed on yellow card] // HEREROLAND­WEST at: / 20°31'S 17°29'E / 18.i.–25.ii.1992 / M. Pusch / Pres. pitf. traps // Isomyia / hauwangai ♂ / sp. nov. / Det. H. Kurahashi [laser­printed on white card with blue perimeter]’; 1♀, ‘ Paratype [laser­printed on yellow card] // 3km W Kuru / BUSHMANLAND // 19°56'S 20°38'E / 9–28.I.1991 / E. Marais / Pres. pitf. traps // Isomyia / hauwangai ♀ / sp. nov. / Det. H. Kurahashi [laser­printed on white card with blue perimeter]’ (holotype, 4♂, 1♀, paratypes NMNW type series # T658; 1♂, paratype NSMT).