Chelilimosina, Papp, László, 2014

Papp, László, 2014, New genera of Afrotropical limosinine sphaerocerids (Diptera: Sphaeroceridae), Zootaxa 3764 (2), pp. 101-130 : 111-113

Chelilimosina gen. n.

Figs 39–53

Type species: Chelilimosina baloghi sp. nov., by present designation.

Gender: feminine.

Etymology. The name of the new genus is composed from the Latin ‘cheli’ (= claw) and the genus name Limosina (the classical large genus of Limosininae ).

Diagnosis. Very small flies (wing length only slightly more than 1.0 mm). Male fore outer claws ( Fig. 49 ) are very large (cf. etymology); inner claw thin but normal. Male genitalia are very characteristic: sternite 8 part small, extremely short (thin), male genitalia extremely asymmetrical, hypandrium comparatively short, its medial part (“rod”) particularly strong, lateral parts not connected to medial part but through membranes only, epandrium has a left-side process to the medial part of hypandrium ( Fig. 39 ), cercus round, partly membranous, appears to be triangular in ventral view, cerci meeting in the sagittal line, subepandrial sclerite broad dorsally but not high, with strong processes to surstylus. Surstylus ( Fig. 47 ) broadly 3-lobed, caudal part broadened horizontally, with 2 broad but not deep processes; anterior pair large with short setae only, strong epiphallus present. Female epiproct is fused to cerci. Body less sclerotised and not granulose. Abdominal tergites well-sclerotised. It keys out to couplet 55 in Papp’s (2008) key. However, contrary to O. ( Opalimosina ) costal vein not produced beyond apex of R4+5, hind tibial ventral spur indistinct, distiphallus, postgonite, etc. are entirely different. Otherwise the new genus keys out to Rohacekia , an Oriental genus in Papp’s (2008) key, but it has a mid ventral seta on mid tibia, no long ventral hairs on male mid tibia, and its sternite 6 part of synsternite is simple in the new genus (cf. Papp 2008: fig. 281). Contrary to Rohacekia , male cerci just meet sagittally.

Description. Head comparatively large, facial plate normal, i.e. not hollowed. Head without inner orbitals. 2 pairs of fronto-orbital setae, 4 pairs of medium-long interfrontal setae. First flagellomere slightly conical but without a rod-like projection. Aristal cilia long.

Thorax. Prosternum very narrow. Scutellum concolorous with mesonotum, without additional setulae. Mesonotum with a single posterior pair of dorsocentral setae. Anepisternum without any seta.

Legs. Mid tibia without a ventral preapical seta, ventroapical strong and a strong mid ventral seta present on mid tibia. Mid basitarsus without a longer ventral seta. Ventral spur in hind tibia indistinct, no characteristic setae on dorsal half of hind tibia but with anterodorsal and posterodorsal rows of longer setae.

Wing not patterned and without microtrichia and with a strong pair of setae sub-basally on costal vein. First costal section with medium-long setae. Vein R4+5 strongly bent up to costa, costal vein not produced beyond apex of R4+5.

Abdomen. Tergites well sclerotised, their marginal setae normal. Preabdomen (except for male sternite 5) not modified at all.

Male sternite 5 broad and short with a pair of long dark caudal processes ( Fig. 42 ; they are not setae and not seen in ventral view), medial part ( Fig. 40 ) emarginated with longer setae. Synsternite ( Fig. 42 ) peculiar: Sternite 6 part with ventral part “broken in the sagittal line, there with a sharp caudal process. Sternite 8 part small, extremely short (thin). Male genitalia extremely asymmetrical: Hypandrium ( Figs 39–40 ) comparatively short, its medial part (“rod”) particularly strong, lateral parts not connected to medial part but through membranes only. Epandrium ( Fig. 43 ) large, also opening large with short pale setae. Epandrium has a left-side process to the medial part of hypandrium ( Fig. 39 ). Cercus round partly membranous (looks triangular in ventral view), cerci meeting in the sagittal line ( Fig. 43 ). Subepandrial sclerite ( Fig. 43 ) broad dorsally but not high, with strong processes to surstylus. Surstylus ( Fig. 47 ) broadly 3-lobed, caudal part broadened horizontally, with 2 broad but not deep processes; anterior part large with short setae only. Strong epiphallus present ( Figs 44–45 ), basiphallus very short vertically placed, its connection to distiphallus is through muscles. Distiphallus large, broad and high, with a large dorsal process and apical structures, incl. a mostly membranous process. Phallapodeme ( Fig. 46 ) rather short rodlike. Postgonite ( Fig. 46 ) simple, rather thick, slightly curved and ends in a blunt apex.

Female preabdominal tergites quite normal. Sternite 2 more than twice as broad as long. Sternites 2 to 6 much narrower than tergites. Tergite 7 not divided at all. Apex of sternite 8 dorsally curved and impressed sagittally, subtriangular in ventral view ( Fig. 51 ), apex of sternite 8 with 2 pairs of thin setae and with fine striation ( Fig. 52 ). Female outer genitalia form a hollow, where tergite 8 and sternite 8 are the most caudal points ( Fig. 50 ). Epiproct and hypoproct are slightly upturned. Cerci fused with epiproct and all weakly sclerotised, cercus with 1 long seta only ( Fig. 48 ), and otherwise cercal seta asymmetrical. Hypoproct very broad, though its sclerotised rim rather narrow. Spermathecae ( Fig. 53 ) peculiar: their body globular, sclerotised part of ducts short and bulbous (no Y-like character of the paired ones would be discernible). Not sclerotised parts of ducts conspicuously thin. Dorsal wall of egg-tube with 2 small dark horizontal platelets (apices rather caudal to that of hypoproct).

Figures

FIGURES 39 – 47. Chelilimosina baloghi sp. n., male postabdomen and genitalia. 39 = epandrium and hypandrium, anterior view, 40 = base of the medial part of hypandrium in higher magnification, 41 = sternite 5, ventral view, 42 = synsternite with medial part of sternite 5, ventral view, 43 = epandrium, cerci and subepandrial sclerite, ventral view, 44 = phallus, lateral view, 45 = basiphallus, caudal view, 46 = postgonite and phallapodeme, right lateral view, 47 = surstylus with contours of ventral part of epandrium, broadest (i. e. a sublateral-subventral) view. (C: cercus, EP: epandrium, HA: hypandrium, ha: hypandrial arms, pgc: connecting sclerite to postgonite). Scale bars: Figs 39, 41 – 42 = 0.2 mm, Figs 40, 43 – 47 = 0.1 mm.

FIGURES 48 – 53. Chelilimosina baloghi sp. n., male tarsal apex and female genitalia. 48 = epiproct fused with cerci and hypoproct, dorsal view (with caudal part of tergite 7, tergite 8 omitted), 49 = male fore 5 th tarsomere with claw, 50 = terminalia in lateral view, 51 = sternite 8, ventral view, 52 = apex of sternite 8 in higher magnification, 53 = spermathecae. (ep + c: epiproct fused with cerci, hy: hypoproct, S 8: sternite 8, T 7: tergite 7, T 8: tergite 8). Scale bars: Fig. 51 = 0.2 mm, Figs 48 – 49, 52 – 53 = 0.1 mm.