Pseudoaerumnosa tenuidens, 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 : 38-39

Pseudoaerumnosa tenuidens sp. n.

Figs 2 D , 3 B , 4 D , 19 B , 21 D

Material studied. Holotype male. MALAYSIA, Sabah, Mainline West , 56 km W Silan, 1–200 m, Malaise trap, 7–25.IX.1987, A.H. Kirk-Spriggs ( NMWC Sabah (Borneo) Expedition, NMWC.Z.1987.094, in NMWC) . Paratypes. MALAYSIA, same data as holotype but 25.IX–14.X.1987, 3 males (in MZH) ; same data as previous but 28.IX–14.X.1987, 4 males (2 in MZH, 2 in NMWC) ; Sabah, Danum Valley , 5°01’N, 117°47’E, 150 m, Malaise trap, 6–9.IX.1987, A.H. Kirk-Spriggs, 2 males ( NMWC Sabah (Borneo) Expedition, NMWC.Z.1987.094, in NMWC) ; same data but 6–12.IX.1987, A.H. Kirk-Spriggs, 2 males ( NMWC Sabah (Borneo) Expedition, NMWC.Z.1987.094, (in MZH) ; same data but 16-24.IX.1987, 1 male (in NMWC) ; same data but 17–24.IX.1987, 1 male (in NMWC) ; same data as previous but 150 m, 1–12.X.1987, 4 males (in NMWC) ; Sabah, Poring, Malaise trap, VIII.1999, N. Laurenne, 6 males (5 in MZH 1 in SDEI) ; Sabah, Bukit Monkobo , 5°48’N, 116°58’E, 900 m, Malaise trap, 7– 13.VIII.1987, A.H. Kirk-Spriggs, 1 male ( NMWC Sabah (Borneo) Expedition, NMWC.Z.1987.094, in NMWC) .

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 2–3 facets wide. Face with 1–4 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 1–2 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 1.3–2.0x 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 2–5 setae. Proepisternum with 1–3 setae or non-setose. Scutellum with 4 moderately long and many short setae. Wing, Figs 2 D , 3 B . Fumose. Length 1.4–1.7 mm. Width/length 0.50–0.55. Anal lobe rather large. Hind margin with dorsal setae only. Veins distinct. R1/R 1.25–1.60. c/w 0.65–0.80. bM and r-m of variable length, stM longer than M-fork. R1 joining c before base of M-fork. stCu longer than bM or r-m. R1 with dorsal setae, bM, r-m and StCu non-setose. Haltere pale brown. Legs. Pale brown. Fore tibial organ unmodified, with some fine setae. Fore tibial spur slightly longer than the tibial width. Abdomen. Pale brown; setae long, dark, and robust. Hypopygium, Figs 4 D , 19 B , 21 D . Brown, like the abdomen, broad; setae dark. Gonocoxa longer than gonostylus. Gonocoxae fused, intergonocoxal area broad and short, without microtrichia, non-setose medially. Ventromedial margin roundish and basally distinct. Setosity of gonocoxa long and rather sparse, shorter at medial margin. Apicomedial seta poorly differentiated. Gonostylus elongated, impressed dorso- and ventromedially, with broad medial lobe, with long and narrow apical tooth with narrow basal part with a small megaseta attached to its ventral side, with 1 subapical and 4 medial megasetae on the lobe, megasetae curved and hyalinous. Tegmen broader than long, roundish and curved laterally, hyalinous, weakly sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme indistinct, rather short, with distinct apical fork.

Female. Unknown.

Discussion. Pseudoaerumnosa tenuidens sp. n. is very similar to P. fragilis sp. n. and P. curvifalx sp. n. For discussion, see under the latter.

Etymology. The name is derived from the Latin words tenuis, narrow, and dens, tooth, referring to the narrow apical tooth of the gonostylus.

Figures

FIGURE 2. Wing, dorsal.A: Pseudoaerumnosa banari sp. n. (paratype). B: P. eminula sp. n. (paratype from Ulu Temburong). C: P. fragilis sp. n. (holotype). D: P. tenuidens sp. n. (holotype). E: P. consuota sp. n. (paratype). F: P. junciseta sp. n. (paratype). Scale 1.0 mm.

FIGURE 3. Part of hind margin of wing, dorsal. A: Pseudoaerumnosa fragilis sp. n. (holotype). B: P. tenuidens sp. n. (holotype). Scale 0.10 mm.

FIGURE 4. Intergonocoxal area, ventral. A: Pseudoaerumnosa banari sp. n. (holotype). B: P. consuota sp. n. (holotype). C: P. fragilis sp. n. (holotype). D: P. tenuidens sp. n. (paratype from Sabah, Mainline West). Scale 0.10 mm.

FIGURE 19. Hypopygium, ventral. A: Pseudoaerumnosa saginata sp. n. (holotype). B: P. tenuidens sp. n. (holotype). Scale 0.10 mm.

FIGURE 21. Gonostylus, ventral. A: Pseudoaerumnosa obovata sp. n. (holotype). B: P. pilicaudata sp. n. (holotype). C: P. quadriquetra sp. n. (holotype). D: P. tenuidens sp. n. (holotype). Scale 0.10 mm.