Pseudoaerumnosa exacuta, 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 : 22-24

Pseudoaerumnosa exacuta sp. n.

Fig. 12 A

Material studied. Holotype male. THAILAND, Kanchanaburi, Khuean Srinagarinda N.P., Chong Kraborg , Malaise trap, 25.IX–2.X.2008, Boonkam & Phumarin (in QSBG) . Paratype. THAILAND, Nakhon Si Thammarat, Namtok Yong N.P., 8°10.434’N, 99°44.508’E, 80 m, behind campground lavatory, Malaise trap, 22–29.X.2008, K. U-prai, 1 male (T4235, in MZH) .

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 2–3 facets wide. Face with 6 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 4–5 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 flagellomere 2x 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 3 setae. Proepisternum with 5 setae. Scutellum with 4 long and many short setae. Wing. Fumose. Length 2.0 mm. Width/length 0.50. Anal lobe rather small. Hind margin with dorsal and ventral setae. Veins distinct. R1/R 1.50. c/w not detectable in the specimens studied. bM as long as r-m, stM slightly shorter M-fork, stCu longer than bM. R5 joining c at about base of M-fork. R1 with dorsal and ventral setae, bM, r-m and StCu non-setose. 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. 12 A . Brown, like the abdomen, broad; setae dark. Gonocoxa broad, slightly longer than gonostylus. Gonocoxae fused, ventromedial margin distinct, intergonocoxal area broad and short, microtrichose, widely non-setose medially. Setosity of gonocoxa long and dense. Apicomedial seta poorly differentiated. Gonostylus elongated, impressed dorso- and ventromedially, with moderate medial lobe, with long, robust, nearly straight apical tooth with a small megaseta attached to its ventral side, with 2 megasetae subapically near the apical tooth, and 3 on the medial lobe, the megasetae slender and hyalinous, slightly curved. Tegmen much broader than long, smoothly curved laterally, hyalinous but weakly sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme rather long with distinct apical fork.

Female. Unknown.

Discussion. See under Pseudoaerumnosa acinacea sp. n.

Etymology. The name is Latin, exacuta , pointed, referring to the straight and pointed apical tooth of the gonostylus.

Figures

FIGURE 12. Hypopygium, ventral. A: Pseudoaerumnosa exacuta sp. n. (holotype). B: P. filispicata sp. n. (holotype). Scale 0.10 mm.