Pseudoaerumnosa tkoci, 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 : 39-41

Pseudoaerumnosa tkoci sp. n.

Fig. 20

Material studied. Holotype male. TAIWAN, Fushan Botanical Garden , 7–9.V.2018, Malaise trap ( MT 3 ) with light, J. Ševčík & M. Tkoč (in NMPC).

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge constricted medially, 2–3 facets wide. Face with 25 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 2 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 2.30 x as long as wide, the longest setae slightly shorter than the width of the flagellomere, neck shorter than wide. Thorax. Brown and unicolorous; setae dark. Anterior pronotum with 2 setae. Proepisternum non-setose. Scutellum with 2 long and many short setae. Wing. Fumose. Length 2.3 mm. Width/ length 0.55.Anal lobe small. Hind margin with dorsal setae only. Veins distinct. R1/R 2.0. c/w 0.75. bM shorter than r-m, stM longer than M-fork, stCu much longer than r-m. R1 joining c beyond 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. 20 . Brown, like the abdomen, broad; setae dark. Gonocoxa broad, slightly longer than gonostylus. Gonocoxae fused, ventromedial margin distinct, intergonocoxal area broad and short, non-microtrichose, narrowly non-setose medially. Setosity of gonocoxa long and dense. Apicomedial seta well differentiated. Gonostylus elongated, impressed dorso- and ventromedially, with moderate medial lobe reaching to apical 1/3 of gonostylus, with long, narrow, slightly curved 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 longer than broad, roundish apically, narrowed at middle, hyalinous apically but narrowly sclerotized laterally, with tiny aedeagal teeth. Aedeagal apodeme moderate, with distinct apical fork.

Female. Unknown.

Discussion. By its gonostylus, Pseudoaerumnosa tkoci sp. n. resembles P. annae sp. n. and the sympatric P. formosa sp. n. but differs from both in having a medially constricted eye bridge, a more setose face, a longer R5, extending beyond the level of the base of the M-fork, in having a longer gonostylus with a less setose medial lobe and a longer tegmen with only narrow lateral sclerotizations. For differences between P. annae and P. formosa , see under P. annae .

Etymology. The species is named after Michal Tkoč, a dipterist at the National Museum, Prague (Czech Re- public), who collected the holotype.

Figures

FIGURE 20. Pseudoaerumnosa tkoci sp. n. (holotype). Scale 0.10 mm.