Pseudoaerumnosa quadriquetra

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: 34-36

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Pseudoaerumnosa quadriquetra

sp. n.

Pseudoaerumnosa quadriquetra  sp. n.

Fig. 18 BView FIGURE 18, 21 CView FIGURE 21

Material studied. Holotype male. MALAYSIA, Sabah, Bukit Monkobo , 5°48’N, 116°58’E, 900 m, stream, Malaise trap, 17–22.VIII.1987, A.H. Kirk-Spriggs (in NMWC)GoogleMaps  . Paratypes. MALAYSIA, Sabah, Danum Valley , 5°01’N, 117°47’E, Malaise trap, 17–24.IX.1987, A.H. Kirk-Spriggs, 1 male (in MZH)GoogleMaps  ; Pahang, Genting Highlands, Chin Swee Cave Temple, ca. 1500 m, forest along winding road, Malaise trap, 2–4.II.2015, J. Ševčík, 1 male (in JSL- UOC)  .

DNA sequence. The DNA sequence of COI barcode region taken from the Pahang paratype is deposited in GenBank. The Accession Number is provided in Table 1. The same specimen was included in the phylogenetic analysis by Vilkamaa et al. (2018) as Pseudoaerumnosa  sp.

Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 1–2 facets wide. Face with 8–10 dark long setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 1 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 1.6–1.95x 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 3 setae. Proepisternum with 4 setae. Scutellum with 4 moderately long and many short setae. Wing. Fumose. Length 2.0– 2.3 mm. Width/length 0.50. Anal lobe rather large. Hind margin with dorsal setae only. Veins distinct. R1/R 2.0–2.45. c/w 0.70. bM longer than r-m, stM longer than 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 as long as the tibial width. Abdomen. Pale brown; setae long, dark, and robust. Hypopygium, Figs 18 BView FIGURE 18, 21 CView FIGURE 21. Brown, like the abdomen, broad. Gonocoxa longer than gonostylus. Gonocoxae fused, intergonocoxal area broad and moderately long, microtrichose and setose, ventromedial margin roundish and distinct. Setosity of gonocoxa long and dense, shorter at medial margin, widely microtrichose basally and basolaterally. Apicomedial seta poorly differentiated. Gonostylus elongated, impressed medially, with a large apical tooth on large basal body, apical tooth with a small megaseta attached to its ventral side, with shallow medial lobe, with 1 subapical megaseta near the apical tooth and 3 megasetae on the lobe, megasetae slightly curved and hyalinous. Tegmen broader than long, subquadrangular, hyalinous, with tiny aedeagal teeth. Aedeagal apodeme long and narrow, with distinct apical fork.

Female. Unknown.

Discussion. Pseudoaerumnosa quadriquetra  sp. n. is similar to P. pilicaudata  sp. n. in having its medial lobe of the gonostylus shallow, with the medial megasetae completely visible in ventral view, not covered by the ventromedial margin of the gonostylus. P. quadriquetra  can be distinguished from P. pilicaudata  in having a narrower gonostylus, only four, rather long, gonostylar megasetae instead of 7–8 short ones, in having a longer and broader apical tooth and in having a broader tegmen with more straight lateral sides, and in having a longer wing vein R1.

Etymology. The name is derived from the Latin words quadra, four, and quetra, corner, referring to the subquadrangular tegmen of the species.


National Museum of Wales


Finnish Museum of Natural History