Hypselothyrea paratenuis, Papp, 2003

Papp, L., 2003, New Species And Records Of Hypselothyrea De Meijere (Diptera, Drosophilidae), Acta Zoologica Academiae Scientiarum Hungaricae 49 (4), pp. 271-294 : 285-286

Hypselothyrea paratenuis sp. n.

( Figs 20–23 )

Holotype male ( HNHM): Vietnam, Cuc phuong, Ninh binh – 6–18. V. 1966., leg. TOPÁL.

Paratypes: Thailand: 1 male, 1 female ( MHNG, genitalia prep. in microvial with glycerol): N Thailand, 1250, Chiang Mai Prov., Doi Suthep-Pui N.P., nr Phuphing Palace, 18.80N / 98.90S, 19. X. 2000 , MERZ & SCHWENDINGER leg.; 1 female ( HNHM): ibid., 26. X.; 1 female ( MHNG): ibid., 1100, above What Phrathat, 18.80N / 98.92E , 27. X., MERZ & SCHWENDINGER leg.; 1 female ( HNHM): ibid., 18.81N / 98.91S , 17. X.

Measurements in mm: body length 3.0 (holotype, caudal half of abdomen strongly downcurved), 3.10–3.30 (paratypes), wing length 2.05 (holotype), 2.25–2.35 (paratypes), wing breadth 0.70 (holotype), 0.71–0.72 (paratypes).

Mostly black. Mesonotum dull brown (holotype) or black (paratypes), pleura shiny, in detail: mesonotum granulose, metanotum and dorsal part of anepimeron microtomentose, pleura otherwise shiny black. Abdomen shiny black. This is a Hypselothyrea of rather robust, strongly ant-like appearance.

Frontal shield actually does not exist in this species. Vertical setae long and thick, emerge on a massive large tubercle. Ocellar structures (ocelli and ocellar setae) on a high tubercle, Instead of a frontal shield, a pair of interfrontal ridges present laterally to ocellar tubercle. Orbitalia similarly modified: a pair of orbital ridges present bearing a pair of long thick anterior proclinate and posterior reclinate fronto-orbital pairs each. Those 7 tubercles/ridges are subshiny, other parts of frons brown (black) microtomentose. Eye densely hairy. Face subshiny in general, shiny below carina. Carina nose-like in profile, very broad, subapically 0.16 mm, slightly more than 1/3 breadth of facial plate (!). Cheeks narrow, white microtomentose. Vibrissa strong, 0.235 mm, emerging on small tubercles. Peristomals weak. Eyes with long fine hairs. Clypeus comparatively very strong, 0.15 mm high, protruding below mouth opening. Palpus brown with a 0.15 mm long apical and a 0.11 mm long ventral medial seta/hair. Arista with 6 dorsal and 2–3 ventral long branches.

Mesonotum dull brown, microgranulate. Scutellum light brown, upright, 0.41 mm (!) high over scutum, dorsal profile not broken. Two pairs of extremely strong dorsocentrals. Apical scutellars very long and thick, scutellar length 0.43 mm, apical scutellars 0.51 mm on a paratype female (more than 0.5 mm long, but apex broken on holotype). Ventral surface of scutellum without dense white setulae. No acrostichals.

Legs ochre, shiny, fore and hind tibia dark brown (except for bases and apices) in holotype, mainly black but fore coxa, basal part of mid and hind femora, whole mid tibia as well as fore tarsomeres and mid and hind tarsi yellow (paratypes). Fore femur with a long row of thick black anteroventral thornlets.

Wingpatterned,reducedbothinlengthandwidth(only2/3bodylength).Veinsbrown.Alittle more than apical fourth of wing light (very light brownish), wing otherwise dark brown with light, diffusely bordered spots in cell r 2+3 above R-M and in cubital cell between levels of cross-veins. Cross-veins also bordered by light spots. Anal cell closed, with a very short, slightly basally directed vein appendage of anal vein. C-index 1.56, C3 fringe on 3/8. Alula with 0.10 mm long marginal hairs. Halteres reduced in size, only 0.25 mm long, light brown.

Abdomen much narrowed subbasally; at caudal end of tergite 2 0.36 mm broad only (head 0.95 mm broad), without macrochaetae. Tergites 1 to 3 modified with a sagittal low blunt ridge and a pair of shallow emarginated groove laterally to it. This complex occupies 1/3 of tergal breadth. Tergites 4–6 dorsally with white setulae, which are less dense than in H. lanigera .

Epandrium comparatively very small, cerci nearly as high as epandrium. Surstylus ( Fig. 20 ) slightly bilobed, outer (lateral) lobe with four thick, comparatively long setae, 9 prensisetae. Phallus rathershortandthick( Fig.21 ),phallapodemeparticularlythick,lateralparameralsetaeextremelythick.

Female oviscapt ( Fig. 22 ) similar to that of H. paralanigera , but dorsal (lateral) setae definitely shorter. Spermatheca ( Fig. 23 ) much longer than broad, surface with small scales (spermathecae weakly sclerotized: after a short wash in sodium-hydroxyde they collapsed and it was possible to make drawing when put them in water only).

Distribution. Viet Nam, Thailand.

Hypselothyrea paratenuis sp. n. is a peculiar species with reduced wings. I am afraid, though it keys to H. tenuis OKADA, 1980 , which was described from New Guinea (Mt. Missim, Wau), they are not closely related. Please note that OKADA did not put his H. tenuis correctly into the key: that species is with 1 pair of dorsocentrals.

Figures

Figs 17–23. 17–19 = Hypselothyrea paralanigera sp. n., paratypes, terminalia: 17 = surstyli, in view (almost ventral) of the broadest extension of the right surstylus, 18 = hypandrium and genitalia, ventral view (hypandrium is almost perpendicular to this plane), 19 = oviscapt, lateral view. 20–23 = H. paratenuis sp. n., paratypes, terminalia: 20 = surstylus, broadest extension (subventral view), 21 = medial part of hypandrium and genitalia, ventral view (hypandrium is almost perpendicular to this plane), 22 = oviscapt, lateral view, 23 = spermatheca (drawn when in water). Scale bars: 0.05 mm