Parascatopse concava, 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 : 91-93

2. Parascatopse concava sp. nov.

( Figs. 6 –10)

Diagnosis. This species can be separated from the Palaearctic species by the strongly concaved median posterior margin of tergite 7. The concavity reaches the middle of tergite 7, with two sharp angles on its posterior margin. The genital capsule of P. concava is rectangular in general shape, proximally with two sharp angles which can be easily distinguished.

Description. Male ( Fig. 6 ). Body length 1.2–1.4 mm, wing length 0.8–0.9 mm.

Head. Dark brown, higher than long; antennae uniformly brown, 10-segmented; flagellum 8- segmented and with microtrichia; last flagellomere elongate, twice as long as preceding flagellomere, covered with at least 3 whorls of microtrichia; eyes holoptic; palpus oval in general shape, one-segmented, slightly sharpened apically; occiput pilose.

Thorax. Yellowish brown, shining, and stout; scutum sparsely covered with short setae; anterior spiracular sclerite setose, generally oval; halters dark, devoid of setae on its stem; knob slightly lighter than stem. Legs short and concolorous with body, except for some dark brown areas on middle and hind femora, as well as part of hind tibia.

Wing ( Fig. 7 ). Nearly hyaline; R 1 and R 4+5 sclerotized, other veins weakly visible; membrane of wings covered with microtrichia, macrosetae on posterior veins and membrane absent; R 1 and R 4+5 smoothly reaching anterior margin; second costal section markedly shorter than first costal section; stem of M much shorter than its forks; M 1 and M 2 complete, long and symmetrical; CuA double curved, without macrosetae.

Abdomen. Strong, dull, longer than wide; tergites 1–7 developed, tergite 1 much thinner and smaller than the others; tergite 7 (Fig. 9) strongly concaved posteriorly; sternites 2–6 developed, sternite 7 (Fig. 8) truncate on posterior margin and setose.

Male terminalia (Fig. 10). Terminalia approximately rectangular, ventrally with a two-branched structure at junction of terminalia and sperm pump; epandrium developed and apically setose; aedeagus obvious and shortened; sperm pump larger than terminalia and dark.

Female. Unknown.

Type Material. HOLOTYPE: ♂, China, Zhejiang, Anji, Mt. Longwang [30°38’N, 119°40’E, 200m], collected by sweep net, 1996. Ⅴ. 12, Hong Wu ( CAU) . PARATYPES: 3♂, same data as holotype ( CAU) .

Etymology. The specific name is derived from the Latin adjective “concavus” and refers to the strongly concaved tergite 7.

Figures

FIGURE 6–7. Parascatopse concava sp. nov. (male). 6. Parascatopse concava sp. nov.; 7. Wing. Scale bar = 1.0 mm. FIGURE 8–9. 8. Male sternite 7; 9. Male tergite 7. Scale bar = 0.1 mm. FIGURE 10. Male terminalia, ventral view. Scale bar = 0.05 mm.