Pyrgotomyia callosa, Korneyev, 2012

Korneyev, V. A., 2012, Revision of the genus Pyrgotomyia Hendel (Diptera: Pyrgotidae), African Invertebrates 53 (1), pp. 187-187 : 191-193

Pyrgotomyia callosa sp. n.

Figs 4, 8 , 14 , 18 , 52

Etymology: From Latin callosus, ­a, ­um (like a callus), referring to the oviscape with callus-like subapical convexity.

Description:

Female.

Head: Length:height:width = 1.0:1.0:1.2; pale orange-yellow, except occiput with brown П-like mark and flagellomere 1 brown in apical two-thirds. Frons shining dark yellow, without brown areas, 1.7× as long as wide in its narrowest part; with 1 short proclinate orbital seta and 12–16 irregular setulae at each side 1–1.5× as long as orbital seta, forming 3 irregular transverse rows posterior of lunule. Parafacial and subocular sclerite entirely shining yellow, without brown areas. Face deeply concave, 1.6× as high as wide, shining; supraclypeal sclerite ( Fig. 4 ) poorly separated from face, 0.8× as high as wide (in its dorsalmost part). Eye 1.15× as high as long and 3.3× as high as gena. Ocellar triangle not defined, ocellar seta moderately developed, twice as long as orbital and postocellar seta and 0.25× as long as medial vertical seta; lateral vertical seta absent.Antenna elongate, pedicel and flagellomere 1 combined about half as long as face; flagellomere 1 slightly shorter than pedicel and 1.4× as long as proboscis and palp.

Thorax: Shining orange-yellow, with pair of reddish brown vittae on postsutural part of mesonotal scutum lateral to dorsocentral setae ( Fig. 8 ); anepisternum with wide brownish yellow vertical spot; mediotergite slightly brownish yellow; setae and setulae black or brown. Postpronotal seta present on both sides. One strong presutural dorsocentral (scapular) and 2 postsutural dorsocentral setae (only one partly broken seta and 3 large alveoli present in holotype); other dorsocentral setulae smaller, at most half as long as setae.

Wing ( Fig. 14 ): 5.7 mm long, with hyaline costal cell; pterostigma and cell r 1 posterior to it yellow; vein R 2+3 slightly deepened but without stump vein; vein R 4+5 setulose from base to at least middle of distance between dm–cu level and apex; crossvein r–m pale brown emarginated; wing in apical part with brown crossband, unbroken and narrowed through vein dm–cu to posterior margin and brown apical portion of r 1 cell; apices of cells r 2+3, r 4+5 and m with narrow, pale brown apical band. Upper calypter long black ciliate, longest ciliae as long as alula width. Distance between wing base and apex of vein R 1 2.6 mm.

Legs: With yellow coxae, trochanters and femora, and brown tibiae and tarsi.All setae and setulae uniformly black, short; no pale dense “grooming brushes”. Claws short.

Abdomen: Shining reddish brown, black setulose. Sternites as in Fig. 18 . Oviscape (Figs 34, 35) moderately short and wide, 1.6 mm long, almost as long as thorax and conspicuously shorter than distance from wing base to vein R 1 apex, and equal to distance from wing base to vein Sc apex; ventrally on basal 0.7, dorsally on whole length short black setulose, apicoventrally and apicolaterally with dense whitish or yellowish microsetulae; in profile curved dorsally, subapically swollen, about 0.8× as wide as at base, with subapicoventral callus. Apex of oviscape rounded, with suberect setae on lateroapical sides (Fig. 35); base of eversible membrane with short but conspicuous ventromedial lobe and two very short lateroventral lobes (rudimentary ventral taeniae) (Fig. 36).Aculeus (Fig. 45) 0.26 mm long, wide, gradually tapered apically, not barbed; conspicuously curved ventrally in profile. One spermatheca (of 3?) found in holotype, oval, poorly sclerotized, with short neck (Fig. 37).

Male. Unknown.

Holotype: ♀ CAMEROON: “ Cameroon / N’Colbisson [3.86403°N 11.46302°E] / 19 xi.1970 / L. Tsacas leg.”, “Piège lumineux” ( MNHN).

Figures

Figs 1–9.Pyrgotomyia spp.:(1) P.ciliata, holotype;(2, 6) P.richteri; (3) P.temporalis; (4, 8) P.callosa sp.n., holotype; (5, 9) P. stuckenbergi sp. n., holotype; (7) P. terebrans sp. n., holotype. (1, 2) head, left view; (3) head, latero-ventral view (antennae, mouthparts and setae not shown); (4–7) supraclypeal sclerite, latero-ventral view; (8, 9) mesonotum, dorsal view.

Figs 10–15. Pyrgotomyia spp., wing: (10) P. ciliata, holotype; (11) P. richteri; (12) P. temporalis; (13) P. terebrans sp. n., holotype; (14) P. callosa sp. n., holotype; (15) P. stuckenbergi sp. n., holotype.

Figs 16–22. Pyrgotomyia spp.: (16, 20) P. richteri, male; (17) P. richteri, female; (18) P. callosa sp. n., female; (19) P. stuckenbergi sp. n., female; (20–22) P. sp. cf. temporalis, male. (16–19) abdominal sternites; (20) epandrium, right view; (21, 22) glans of phallus, right and ventral views (slightly enlarged compared to 20).

Figs 46–53. Pyrgotomyia spp., habitus: (46) P. richteri, female, KwaZulu-Natal; (47) P. sp. cf. temporalis, male, Kenya; (48) P. temporalis, holotype female, Togo; (49) P. temporalis, female, Tanzania; (50) P. terebrans sp. n., holotype female, Ivory Coast; (51) P. sp. cf. terebrans, male, Nigeria; (52) P. callosa sp. n., holotype female, Cameroon; (53) P. stuckenbergi sp. n., holotype female, Nigeria. Scale bar = 5 mm.