Bradysia abrupta, Vilkamaa & Suuronen, 2019

Vilkamaa, Pekka & Suuronen, Anna, 2019, Definition of the Bradysia luctifica group (Diptera, Sciaridae), with the description of five new species, Zootaxa 4576 (1), pp. 151-161 : 153-156

Bradysia abrupta sp. n.

Figs 1 A, D , 2 , 3

Material studied. Holotype male. MALAYSIA, Pahang, Cameron Highlands, Tanah Rata, Gunung Jasar , 1400 m, Malaise trap, 20–26.II.1995, A. Heinakroon (in SMNH) . Paratypes. Same data as holotype, 1 male (in MZH) ; MALAYSIA, Selangor, Genting Highlands, Gunung Ulu Kali , 5650 ft, forest edge, Malaise trap, 12–22.III.1997, H. Hippa, M. Jaschhof & B. Viklund, 9 males (4 in MZH, 5 in SMNH) .

Description. Male. Head. Face and antenna concolorous pale brown, maxillary palpus very pale brown. Eye bridge 2–3 facets wide. Face with 25–38 short and fine setae. Clypeus with 1–3 setae or rarely non-setose. Maxillary palpus with 3 segments; 1 st segment large, much longer and wider than other segments, 2 nd and 3 rd segments equally long ( Fig. 1 D ); 1 st segment with 5–9 setae, with well-demarcated, large dorsal patch of sensilla; surface of antennal flagellomeres smooth, densely setose, body of 4 th flagellomere 1.4–1.6x as long as wide, the neck shorter than wide, the longest setae shorter than the width of flagellomere ( Fig. 1 A ). Thorax. Brown, setae dark. Anterior pronotum with 2–6 setae. Proepisternum with 5–11 setae. Scutellum with 4 longer and some short setae. Wing. Fumose. Length 2.3–2.6 mm. Width/length 0.50. Anal lobe large. Veins distinct. stM equally long as fork of M. R1/R 0.7–0.8. c/ w 0.6 –0.8. r-m and bM nearly equal in length. bM non-setose, r-m non-setose, rarely with 1 seta. Halter yellow. Legs. Fore coxa yellow or pale brown, middle and hind coxa pale brown. Coxal setae dark. Tibiae and tarsi yellow. Fore tibial organ with pale vestiture forming a row. Fore tibial spur longer than the tibial width. Claws without teeth. Abdomen. Pale brown, setae dark, rather strong and long. Hypopygium ( Figs 2 , 3 ). Brown, concolorous with abdomen. Intergonocoxal area rather short. Gonocoxae broad, basally united (Ushaped), longer than gonostylus, with long setosity, medial margin richly setose, membraneous part with short setae, without microtrichia. Gonostylus evenly narrow, strongly curved, apex transversely cut, richly setose, apex with numerous blunt setae and with a small dorsal lobe with some short and thick megasetae, without apical tooth. Tegmen conical, with medial sclerotized structures, apicoventrally with numerous small teeth, dorsally with large hyalinous apical part, with long strongly sclerotized basal apodemes, with a large area of strong aedeagal teeth. Aedeagal apodeme short.

Discussion. Bradysia abrupta sp. n. is similar to B. conflexa sp. n. and B. luctifica and B. calicula sp. n. in having a broad apicodorsal hyalinous process in its tegmen. Bradysia abrupta and B. conflexa are similar in having their gonostylus evenly broad or slightly widened towards apex, whereas B. luctifica and B. calicula have their gonostylus narrowed towards apex. Bradysia abrupta can be distinguished from B. conflexa by having its tegmen laterally straight and its gonostylus evenly narrow, whereas B. conflexa has its tegmen laterally curved and the gonostylus widened towards apex. For discussion of B. luctifica and B. calicula , see under the latter.

Etymology. The name is Latin, abrupta , abrupt, referring to the transversely cut apex of the gonostylus.

Figures

FIGURE 1. A, B. 4 th antennal flagellomere, frontal. C, D. Maxillary palpus, dorsolateral. A, D: Bradysia abrupta sp. n. (paratypes). B: B. fornicata sp. n. (holotype). C: B. luctifica (Skuse, 1888) (from Ceram). Scale 0.10 mm.

FIGURE 2. Bradysia abrupta sp. n. (A paratype, B, C holotype). A. Apical part of gonostylus, dorsal. B. Gonostylus, ventral. C. Part of hypopygium, ventral. Scale 0.10 mm.

FIGURE 3. Bradysia abrupta sp. n. (A holotype, B paratype). A. Hypopygium, ventral. B. Hypopygium, dorsal. Scale 0.10 mm.