Pseudoaerumnosa cryptoloba, 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 : 17-19

Pseudoaerumnosa cryptoloba sp. n.

Fig. 9 B , 11 C

Material studied. Holotype male. MALAYSIA, Sabah, Bukit Monkobo , 5°48’N, 116°58’E, 900 m, Malaise trap, 7–13.VIII.1987, A.H. Kirk-Spriggs (in NMWC) . Paratypes. MALAYSIA, same data as holotype, 5 males (3 in NMWC, 2 in MZH) ; same data but 11–17.VIII.1987, 1 male (in NMWC) ; same data but 1200 m, 23–24.VIII.1987, 1 male (in NMWC) .

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 2–3 facets wide. Face with 2–6 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment; with 1 (rarely 3) pointed seta, 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 1.45–1.95x 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 2–3 setae (nonsetose in one specimen studied). Proepisternum with 2–6 setae. Scutellum with 4 long and many short setae. Wing. Fumose. Length 1.8–2.1 mm. Width/length 0.55. Anal lobe rather large. Hind margin with dorsal setae only. Veins distinct. R1/R 1.90–2.45. c/w 0.70–0.80. bM longer than r-m, stM longer than M-fork. stCu longer than bM. R1 joining c before 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, Figs 9 B , 11 C . Brown, like the abdomen, broad. Gonocoxa longer than gonostylus. Gonocoxae fused, intergonocoxal area broad and short, microtrichose, with a non-setose area medially, medial ventromedial margin roundish and distinct. Setosity of gonocoxa long, shorter at medial margin, microtrichose only basally and basolaterally. Apicomedial seta poorly differentiated. Gonostylus elongated, strongly impressed medially, with a large apical tooth with a small megaseta attached to its ventral side, with 3 megasetae in medial excavation, middle megaseta on a small lobe, megasetae curved and hyalinous. Tegmen broad, curved laterally, with an apicodorsal broad finger-like projection, hyalinous apically, with a short sclerotized rim subapically, weakly sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme long, with distinct apical fork.

Female. Unknown.

Discussion. By its gonostylus, Pseudoaerumnosa cryptoloba sp. n. is very similar to P. eminula sp. n. in having a narrow, strongly impressed gonostylus with the megasetae in the deep excavation. The species differ in their tegmen, P. cryptoloba having the tegmen roundishly curved laterally and with an evenly broad finger-like process on the dorsal side of the margin of the tegmen, whereas P. eminula has its tegmen with distinct pointed apicolateral corners and the finger-like process at the same level with the margin of the tegmen. In having a finger-like process of tegmen, both species resemble P. clavidactyla , but the latter has large basal bodies of its medial megasetae of the gonostylus.

Etymology. The name is formed from the Latinized Greek word, krypto, hide, and the Latin word lobus, lobe, referring to the short gonostylar lobe, hidden in the medial excavation.

Figures

FIGURE 9. Hypopygium, ventral. A: Pseudoaerumnosa consuota sp. n. (holotype). B: P. cryptoloba sp. n. (holotype). Scale 0.10 mm.

FIGURE 11. Gonostylus, ventral. A: Pseudoaerumnosa clavidactyla sp. n. (holotype). B: P. collicola sp. n. (paratype). C: P. cryptoloba sp. n. (holotype). D: P. eminula sp. n. (paratype from Ulu Temburong). Scale 0.10 mm.