Pseudoaerumnosa curvifalx, Vilkamaa & Halenius & Ševčík, 2019

Vilkamaa, Pekka, Halenius, Pentti & Ševčík, Jan, 2019, Review of Pseudoaerumnosa Rudzinski (Diptera, Sciaridae), with the description of twenty-four new species, Zootaxa 4656 (1), pp. 1-42 : 19

Pseudoaerumnosa curvifalx sp. n.

Fig. 10 A

Material studied. Holotype male. MALAYSIA, Pahang, Cameron Highlands, Tanah Rata, Gunung Jasar , 1400 m, Malaise trap, 17–22.XI.1994, A. Heinakroon (in SMNH) . Paratypes. MALAYSIA, same data as holotype, 1 male (in MZH) ; same data as previous but 22–27.XI.1994, 6 males (3 in SMNH, 3 in MZH); Pahang, Genting Tea Estate , 2000 ft, Malaise trap, VII–IX.1981, H. S. Barlow, 1 male (B.M. 1981-549, in BMNH) .

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 2–4 facets wide. Face with 4–9 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 2–4 pointed setae, with a large dorsal patch of sensilla. Antenna short, antennal flagellomeres laterally flattened, asymmetrical in relation to their necks, frontal part larger; densely setose, setae curved, body of 4th antennal flagellomere 1.4–1.85x as long as wide, the longest setae much shorter than the width of the flagellomere, neck shorter than wide. Thorax. Brown and unicolorous; setae dark. Anterior pronotum with 1–3 setae. Proepisternum with 1–3 setae. Scutellum with 2 long and many short setae. Wing. Fumose. Length 1.7–2.2 mm. Width/length 0.50–0.55. Anal lobe moderate. Hind margin with dorsal and ventral setae. Veins distinct. R1/R 1.40–1.85. c/w 0.70–0.90. bM slightly longer or as long as r-m, stM longer than M-fork, stCu shorter than bM. R1 joining c before base of M-fork. R1 with dorsal and ventral setae, bM and stCu non-setose, r-m non-setose or with 1 seta. Haltere pale brown. Legs. Yellow. Fore tibial organ unmodified, with some fine setae. Fore tibial spur longer than the tibial width. Abdomen. Pale brown; setae long, dark, and robust. Hypopygium, Fig. 10 A . Brown, like the abdomen, broad; setae dark. Gonocoxa broad, longer than gonostylus. Gonocoxae fused, ventromedial margin distinct, intergonocoxal area broad and short, microtrichose, broadly non-setose medially. Setosity of gonocoxa long and dense, shorter at medial margin. Apicomedial seta poorly differentiated. Gonostylus elongated, narrowed apically, impressed dorso- and ventromedially, with moderate medial lobe, with slender, curved apical tooth with a small megaseta attached to its ventral side, with 1 (rarely 2) subapical megasetae near the base of the tooth, and 2–3 on the medial lobe, the megasetae slender and hyalinous, slightly curved. Tegmen broader than long, broadened basolaterally, hyalinous but weakly sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme short and broad with long apical fork.

Female. Unknown.

Discussion. Pseudoaerumnosa curvifalx sp. n. resembles P. fragilis sp. n. and P. tenuidens sp. n. in having a broad tegmen and in having only one subapical megaseta ( P. curvifalx has rarely two). The species differ in the form of their tegmen, P. curvifalx having it abruptly narrowed at the middle, P. fragilis straight laterally and P. tenuidens broadly roundish laterally. Furthermore, P. curvifalx has a more strongly curved apical tooth of the gonostylus with a broader basal part, whereas P. fragilis and P. tenuidens have a nearly straight and very slender apical tooth with a narrow basal part. Pseudoaerumnosa fragilis can further be distinguished from P. tenuidens in having a broader gonostylar lobe and in having the hind margin of the wing with both dorsal and ventral setae, P. tenuidens having only dorsal ones.

Etymology. The name is derived from the Latin words curvus, bent, and falx, sickle, referring to the strongly curved apical tooth of the gonostylus.

Figures

FIGURE 10. Hypopygium, ventral. A: Pseudoaerumnosa curvifalx sp. n. (holotype). B: P. eminula sp. n. (paratype from Ulu Temburong). Scale 0.10 mm.