Impatiophila trifurcatosternata Fu & Gao

Fu, Zhao, Toda, Masanori J., Li, Nan-Nan, Zhang, Ya-Ping & Gao, Jian-Jun, 2016, A new genus of anthophilous drosophilids, Impatiophila (Diptera, Drosophilidae): morphology, DNA barcoding and molecular phylogeny, with descriptions of thirty-nine new species, Zootaxa 4120 (1), pp. 1-100 : 54-55

20) Impatiophila trifurcatosternata Fu & Gao , sp. nov.

( Fig. 30 ; Pl. 3C; Pl. 6R)

Diagnosis. Setae of middle row on 2nd costal section all weak, trichoid. Hindleg tibia with 1 black, apically blunt, stout spine at outer apex on underside. Tenth sternite 3/5 as wide as long, narrowing ventrally, with W-shaped notch medially on dorsal margin ( Fig. 30 D). Oviscapt valve with 4−5 dorsal ovisensilla ( Fig. 30 H).

Description (♂, ♀). Head: Cibarium with 3 medial and 4 posterior sensilla per side. Labellum with 5‒6 pseudotracheae per side.

Thorax (Pl. 3C): Postpronotum, scutum and scutellum black; pleura blackish brown to black.

Wing (Pl. 3C) pale brown; veins dark brown. C1 setae 2, subequal. Haltere pale yellow.

Legs (Pl. 3C) yellowish brown.

Abdomen (Pl. 3C): Tergites blackish brown. Sternites grayish yellow; male VI somewhat quadrate, slightly wider than long, nearly straight on posterior margin.

Male terminalia ( Fig. 30 A −F): Epandrium pubescent posteriorly on dorsal 1/2, ventrally with ca. 10 long setae; caudoventral portion round apically, with ca. 30 short setulae. Surstylus with 1 thick seta in addition to 1 stout, upturned prensiseta around caudodorsal corner, 5 apically converging prensisetae along distal margin and 2 short setae near ventral apex. Cercus sparsely pubescent on anteromedial portion, with ca. 25 long setae. Hypandrium twice as long as wide, slightly narrowing posteriorly, round on anterior margin. Gonopod apically moderately protruded. Paramere not longer than twice of width, with 6 sensilla. Aedeagal basal process about 3/5 length of paramere.

Female terminalia ( Fig. 30 G, H; Pl. 6R): Oviscapt valve brown, gently curved on dorsosubapical margin and strongly expanded dorsomedially in lateral view, with 4−5 dorsal ovisensilla, 10−12 lateral ones on slightly convex (in ventral view) margin of apicolateral flap and 16 distally slightly increasing in size on convex, ventral margin. Spermathecal capsule brown; introvert depth of duct about 1/2 of capsule height.

Measurements: BL = 2.07 (5♂ paratypes: 1.87−2.22, 5♀ paratypes: 2.20−2.55) mm, ThL = 0.98 (0.83−0.93, 0.89−0.97) mm, WL = 1.80 (1.73−1.92, 1.81−1.99) mm, WW = 0.79 (0.73−0.83, 0.77−0.87) mm.

Indices: arb = 3/1 (5♂, 5♀ paratypes: 2−3/1), FW/HW = 0.42 (0.39−0.45), ch/o = 0.10 (0.07−0.10), prorb = 0.91 (0.95−1.17), rcorb = 0.66 (0.68−0.86), orbito = 0.89 (0.82−1.24), vb = 0.42 (0.37−0.52), dcl = 0.57 (0.51−0.57), dcp = 0.35 (0.28−0.44), sterno = 0.70 (0.70−0.81), m-sterno = 0.74 (0.66−0.95), sctl = 0.99 (0.93−1.03), sctlp = 1.04 (0.96−1.22), C = 2.37 (2.15−2.60), 4c = 0.85 (0.77−0.95), 4v = 1.51 (1.42−1.69), 5x = 1.57 (1.44−1.81), ac = 2.69 (2.54−2.98), M = 0.40 (0.38−0.47).

Holotype. ♂ (#00551), Banpo, Yixiang Town, Simao County, Pu’er District, Yunnan, China, 2.x.2011, ex Impatiens sp.5, J.J. Gao ( KIZ).

Paratypes. CHINA: 5♂, 5♀ (#00111, #00112, #01619−26), same data as holotype ( KIZ, SEHU).

Distribution. China (Yunnan).

Etymology. Referring to the tenth sternite (sternum) apically looked like trifurcated (trifurcatus).

Figures

FIGURE 30. Impatiophila trifurcatosternata Fu & Gao, sp. nov. Adult male (holotype, # 00551) and female (paratype, # 00111): A, periphallic organs (caudolateral view); B, caudoventral part of epandrium; C, surstylus (caudal view); D, tenth sternite; E, phallic organs (dorsal view); F, phallic organs (lateral view); G, oviscapt (lateral view); H, oviscapt (ventral view).