Parascatopse rotunda, Xiao & Li & Yang, 2024

Xiao, Yishen, Li, Zhu & Yang, Ding, 2024, Two new species of Parascatopse Cook, 1955 (Diptera: Scatopsidae) from China, with a key to species in the Palearctic and Oriental Regions, Zootaxa 5538 (1), pp. 89-94 : 90

1. Parascatopse rotunda sp. nov.

( Figs. 1 –5)

Diagnosis. This species can be easily distinguished from other Parascatopse species by the obviously concaved median posterior margin of tergite 7. The shape of the terminalia is somehow rounded in general shape, with the epandrium long and bifurcated apically. P. distorta also bears a long epandrium, but not bifurcate at apex.

Description. Male ( Fig. 1 ). Body length approximately 1.3 mm, Wing length 1.1 mm.

Head. Dark brown, slightly higher than long; antennae uniformly brown, 10 segmented; flagellum 8 segmented, each flagellomere with a whorl of microtrichia; last flagellomere obviously elongate, twice as long as preceding one; eyes holoptic, meeting over antennae; palpus oval, one-segmented, rounded and setose apically; occiput pilose.

Thorax. Stout and shining; scutum sparsely covered with short setae; anterior spiracular sclerite relatively large, setose, somewhat oval in shape. Halters concolorous with body, devoid of setae; knobs slightly darker than the stem. Legs short, concolorous with body, except for a darker area on middle and hind tibiae; tarsi somewhat lighter.

Wing ( Fig. 2 ). Nearly hyaline; anterior veins, including R 1 and R 4+5 sclerotized and brown, other veins lighter colored, weakly visible; membrane of wing covered with dense microtrichia, few macrosetae present on posterior veins; R 1 and R 4+5 smoothly reaching anterior margin; second costal section slightly shorter than first costal section; stem of M short, M 1 and M 2 complete and longer than stem, relatively symmetrical; CuA double curved, bearing at least 4 macrotrichia.

Abdomen. Strong, longer than wide, tergites and sternites relatively dull; tergites 1–7 well-developed, but tergite 1 much smaller in size; tergite 7 (Fig. 4) setose, with obviously concaved median posterior margin; sternites 2–6 developed; sternite 7 (Fig. 3) truncate posteriorly, with somewhat irregular and indistinct posterior margin.

Male terminalia (Fig. 5). Terminalia dorsally rounded in general shape, with its margin smoothly folded towards ventral side, forming a bowl-like structure; epandrium developed and setose, with a deep and thin concave incision posteriorly; aedeagus missing during dissection; sperm pump obviously larger than terminalia and dark-colored, conspicuously visible without dissection.

Female. Unknown.

Type Material. HOLOTYPE: ♂, China, Jilin province, Antu, Dayangcha [42°22’ N, 127°55’ E, 891m], collected by sweep net, 2023. VII. 20, Yishen Xiao ( CAU).

Etymology. The specific name is derived from the Latin adjective “rotundus”, refers to the rounded terminalia of male.

Figures

FIGURE 1–2. Parascatopse rotunda sp. nov. (male). 1. Parascatopse rotunda sp. nov.; 2. Wing. Scale bar = 1.0 mm. FIGURE 3–4. 3. Male sternite 7; 4. Male tergite 7. Scale bar = 0.1 mm. FIGURE 5. Male terminalia, ventral view. Scale bar = 0.05 mm.