Pseudoaerumnosa acinacea, 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 : 7-9

Pseudoaerumnosa acinacea sp. n.

Fig. 5 A

Material studied. Holotype male. THAILAND, Phetchabun, Thung Salaeng Luang N.P., Kaeng Wang Nam Yen, 16°37.531’N, 100°53.745’E, Malaise trap, 29.XI–6.XII.2006, Tiger Project (in QSBG) . Paratype. THAILAND, same data as holotype, 1 male (in MZH) .

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge not fully visible in the specimens studied. Face with 4 long dark setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 3 pointed setae, with a large dorsal patch of sensilla. Antennae missing (not studied). Thorax. Brown and unicolorous; setae dark. Anterior pronotum with 5 setae. Proepisternum with 4–6 setae. Scutellum with 2 long and many short setae. Wing. Broken in the specimen studied. Fumose. Anal lobe moderate. Hind margin with dorsal and ventral setae. Veins distinct. R1/R 1.55. c/w 0.80. bM shorter 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, Fig. 5 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 narrow medial lobe, with long, slender, 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 broader than long, smoothly curved laterally, hyalinous but weakly sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme broad but indistinct, with apical fork.

Female. Unknown.

Discussion. Pseudoaerumnosa acinacea sp. n. is similar to P. exacuta sp. n. and differs from all other congeneric species in having a very broad tegmen with roundish lateral and apical sides. Pseudoaerumnosa acinacea differs from P. exacuta in having its gonocoxa distinctly longer than the gonostylus and in having the apical tooth of the gonostylus curved, whereas P. exacuta has a short gonocoxa and a straight apical tooth.

Etymology. The name is Latin, acinacea , sable-like, referring to the curved apical tooth of the gonostylus.

Figures

FIGURE 5. Hypopygium, ventral. A: Pseudoaerumnosa acinacea sp. n. (holotype). B: P. ampliata sp. n. (holotype). Scale 0.10 mm.