Geloemyia trifasciata ( Enderlein, 1942 ) Korneyev, 2015

Korneyev, V. A., 2015, Review Of The Genus Geloemyia (Diptera, Pyrgotidae), With Discussion Of Its Taxonomic Position, Vestnik Zoologii 49 (6), pp. 497-518 : 513-516

Geloemyia trifasciata ( Enderlein, 1942) comb. n. (fig. 3, 4, 12, 88–99 )

Enderlein, 1942: 109; Hennig, 1960: 329; Steyskal, 1980: 562 ( Trichempodia ).

M a t e r i a l. Type. Holotype ♀: [ Madagascar:] “ Sambirano / N.-O. Madagasc.[ar]”, [clean blue label], “Typus” [red label], “ Trichempodia / trifasciata / Type Enderl. ♀ / Dr. Enderlein det. 19340” ( MNKB).

Non-type. Madagascar: “ Perinet ”, “Institut Scientifique Madagascar”, 3 ♂, 5 ♀ ( DEI) ; Maroantsetra , à la lumière. 2 ♂; Manambato sur l’Anove , Sahafanjona, 1 ♀; Madagascar Centre-Est: R. N. III. Nosivola, 1 ♂, 4 ♀; Mora-manga, Sandrangato. 1 ♂; Périnet, 9 ♂, 30 ♀ ( MHNP) ; Andasibe , Perinet Nat. Reserve, 18°50' S 48°23' E, h = 1100 m, 1, 4–5, 11.12.2000, 2 ♂, 3 ♀ , idem, h = 1200 m, at light, 30.12.2003 – 8.01.2004, 5 ♂, 24 ♀ (Dolin & Andreeva) ( SIZK) ; Ibity Mts , Analamazotra, Manandona, 14.04.2007, at light, 2 ♀ (W. Mey) ( MNKB) .

D i a g n o s i s. This species can be recognized from combination of the head quadrangular in profile, with the parafacial dorsally 0.7–1× as long as flagellomere 1 width, face slightly receding, epistome, twice as high as wide, and peristomal cavity moderately short (0.8× as long as longitudinal diameter of eye), ocellar setae long; wing with five crossbands and a few additional pale brown spots between them; vein R

2+3

with stump vein; vein R

4+5 setulose dorsally; crossvein dm-cu forming angle about 60° with vein CuA 1; mesonotum with 1 presutural and 3 postsutural dorsocentral setae; scutellum with 2 pairs of setae but without setulae; female mid femur without femoral organ; oviscape 1.5× as long as preabdominal tergites combined.

D e s c r i p t i o n. Head ( fig. 90, 91 ) yellow to brownish yellow, quadrangular in profile, height: length: width ratio = 1: 1.1: 1.2; with face slightly receding, and peristomal cavity moderately short; frontal vitta yellow, matt, microtrichose, black setulose anterolaterally, medially bare, 1.27× as long as wide in posterior half; parafacial 0.7–1×as wide as flagellomere 1 width; eye 1.5–1.8× as high as long, twice as long as parafacial and 4–5× as high as gena. Face concave, with faint medial suture, in ventral one-third with short incomplete carina. Epistome elongate pentagonal, as long as antennal grooves and twice as high as wide at its middle. Gena with short and low, matt orange or brownish, subocular sclerite; postgena anteriorly with 5–6 subequal setae and 3–5 shorter setulae. Occiput entirely yellow. First flagellomere entirely reddish yellow, 1.1–1.2 as long as wide, 1.1–1.2× as long as pedicel and 2.5× as long as scape. Arista reddish yellow in basal half, 2-segmented, bare. Scape as long as wide. Palp yellow, wide oval, 1.7× as long as wide, and as long as first flagellomere. Labellum small, almost as long as palp. Lateral vertical setae (vte) 0.15–0.2× as long as medial vertical setae (vti); vti twice as long as pedicel, twice as long as ocellar and 2.5× as long as postocellar and orbital setae and 2–2.5× as long as setulae above lunule.

Thorax yellow to brownish yellow, often with reddish or reddish brown vittae at insertion of muscles on dorsum and prefragmal part of anepisternum. Prosternum saddle-like, short setulose. Postpronotal lobe with 4–5 setulae and one long seta; proepisternum with 4–5 setae. Scutum as long as wide, subshining yellow with faint brown areas, sparsely black setulose, with white microtrichia not obscuring underlying cuticle; 2 notopleural, 1 presutural and1 postsutural supra-alar, 1 intra-alar, 1 postalar, 1 short presutural and 3–4 postsutural dorsocentral, and 0–1 acrostichal setae (if present, at most twice longer than setulae). Scutellum yellow, whitish microtrichose, with 2 pairs of setae: apical 1.5× as long as scutellum and basal as long as scutellum, but without setulae (fig.1, 5). Anepisternum yellow, with reddish or brownish anterior part covered with 10–12 short setulae; posterior part with 1–2 long setae and 6–8 irregular long setulae; anepimeron with 1–2 long setae and 1–2 short setulae; katepisternum with 1–3 long setae and 1–2 thinner and slightly shorter setulae dorsally and 2–3 setae medioventrally, anterior of mid coxa. Katatergite, anatergite and mediotergite matt yellow to brown.

Wing (fig. 3, 4, 89, 92 ) 2.6–2.8× as long as wide, yellowish or hyaline with highly variable pattern of crossbands with gray spots between them partly fused. Costa with conspicuous humeral and subcostal break, subcostal vein broken at apex and not joined to costa. Pterostigma 0.3× as long as costal cell. Vein R sinuate, with stump vein. Vein R 4+5 dorsally setulose over almost entire length. Cell cup closed by slightly sinuate crossvein and with very short lobe. Wing length 5.5–7.0 mm. Lower calypter narrow, without cilia; upper calypter with long and dense setulae forming black fringe. Halter creamy white.

2+3

Legs entirely yellow, black setulose and setose, as described for G. namibica sp. n.; Female fore tarsus (fig. 12) yellow, unmodified, with moderately short and sparse setulae; claw 0.8× as long as tarsomere width.

Abdomen moderately wide, with syntergite 1+2 transverse, 0.6× as long as wide and 0.7× as long as tergites 3–6 combined. Sternites of female wide, with short setulae and 6–8 long marginal and submarginal setae on posterior margins, synsternite 1+2 trapezoid, sternites 3–5 subrectangular, 1.1–1.2 times longer than wide; sternite 6 transverse. Sternites of male slightly wider than those of G. namibica sp. n.: synsternite 1+2 long trapezoid, sternites 3–4 narrow, c. 3× as long as wide, sternite 4 with oval posterior portion bearing 4–6 setae and 13–15 short setulae; sternite 5 with narrow equilaterally triangular.

Female genitalia. Oviscape ( fig. 89 ) entirely orange, 1.3 mm long, uncompressed, cylindrical, 3× as long as wide basally, sparsely black setulose, and as 1.5× as long as tergites 3–6 combined, with apex short and inconspicuously bent dorsally, laterally bearing long setulae 1.2–1.3× as long as oviscape width ( fig. 93 ). Dorsal (dorso-medial) lobes absent, latero-ventral lobes very short, medial lobe long, 1.2× as long as width of apex. Eversible membrane dorsally wrinkled ( fig. 93 ). Aculeus ( fig. 94, 95 ) tapered apically, with conspicuous steps in apical one-third and distinctive preapical constriction, 4.7× as long as wide at middle. Ventral receptacle as in other Pyrgotinae. Spermathecae very long, sausagelike, 10× as long as wide, with sclerotized apices ( fig. 96 ).

Male genitalia as on fig. 97–99 , very similar to those of G. namibica .

Remarks. G. trifasciata is one of the most common species of the genus, known from big series, with wide range of variability in wing pattern easily observed, including sexual dimorphism as has been described by Hennig (1960); it apparently forms a monophyletic lineage with Mainland African G. namibica sp. n. (see remarks to that species).

Figures

Fig. 88–99.Geloemyia trifasciata: non-type ♀ (88, 90–96) and ♂ (89, 97–99) (SIZK): 88, 89 — habitus, left; 90, 91 — head (90 — lateral, 91 — anterior view); 92 — right wing, dorsally; 93 — apex of oviscape and eversible membrane, lateral view; 94 — aculeus, ventrally; 95 — same, apex, enlarged; 96 — spermathecae; 97 — epandrium and hypandrium, right view; 98, 99 — phallus glans (98 — ventral, 99 — lateral view).