Impatiophila chiasmosternata 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 : 70-71

33) Impatiophila chiasmosternata Fu & Gao , sp. nov.

( Fig. 39 ; Pl. 4D; Pl. 7F)

Diagnosis. Abdominal tergites II −VI with black, laterally broadened caudal bands medially widely interrupted or constricted on II −IV, narrowly notched on V, but more or less convex on VI (Pl. 4D). Tenth sternite as broad as long, dorsally much dilated, with large, V-shaped notch medially on dorsal margin ( Fig. 39 D).

Description (♂, ♀). Head: Cibarium with 3−4 medial and 6−7 posterior sensilla per side. Labellum with 6 pseudotracheae per side.

Thorax (Pl. 4D): Postpronotum brown; scutum glossy black, pale along lines connecting ipsilateral dorsocentral setae; scutellum blackish brown, grayish brown laterally; pleura brown to blackish brown.

Wing (Pl. 4D) hyaline, slightly infuscate; veins brown. C1 setae 2, subequal. Haltere pale yellow.

Legs (Pl. 4D) yellowish brown; hindleg tarsomere I with 1 black, apically blunt, stout spine at outer apex on underside.

Abdomen: Sternites pale yellow.

Male terminalia ( Fig. 39 A −F): Epandrium unpubescent, with ca. 14 long setae on ventral half and ca. 11 shorter setae on caudoventral portion. Surstylus with 2 long setae in addition to 2 stout, more or less upturned prensisetae around caudodorsal corner, 7 prensisetae along distal margin and 1 seta at ventral apex. Cercus unpubescent, with ca. 21 long setae. Hypandrium largely parallel-sided, with dilated, posterolateral corners and roundish anterior margin, posteriorly convex in lateral view. Gonopod long, protruded ventrad apically. Paramere apically somewhat truncate, with 8 sensilla. Aedeagal basal process about 1/2 length of paramere; aedeagal apodeme entirely thick in lateral view.

Female terminalia ( Fig. 39 G, H; Pl. 7F): Oviscapt valve yellowish brown, obliquely truncate on dorsosubapical margin in lateral view, with 3 dorsal ovisensilla and 19−20 ventral ones more widely spaced in subdistal portion. Spermathecal capsule brown; introvert depth of duct about 5/6 of capsule height.

Measurements: BL = 2.52 (5♂ paratypes: 2.38−2.86, 5♀ paratypes: 2.79−3.13) mm, ThL = 1.20 (0.99−1.29, 1.25−1.35) mm, WL = 2.50 (2.28−2.62, 2.62−2.82) mm, WW = 1.05 (0.95−1.12, 1.09−1.16) mm.

Indices. arb = 2/1 (5♂, 5♀ paratypes: 2/1), FW/HW = 0.45 (0.42−0.47), ch/o = 0.09 (0.08−0.12), prorb = 1.10 (1.04−1.35), rcorb = 0.55 (0.54−0.70), orbito = 0.89 (0.91−1.05), vb = 0.32 (0.35−0.48), dcl = 0.53 (0.50−0.62), dcp = 0.34 (0.36−0.43), sterno = 0.65 (0.62−0.72), m-sterno = 0.74 (0.60−0.78), sctl = 1.01 (0.91−1.07), sctlp = 1.11 (0.92−1.11), C = 3.23 (2.62−3.30), 4c = 0.71 (0.70−0.80), 4v = 1.56 (1.59−1.78), 5x = 1.38 (1.25−1.65), ac = 2.03 (2.12−2.55), M = 0.38 (0.40−0.48), C3F = 0.28 (0.20−0.36).

Holotype. ♂ (#00109), Liangjiaren, Hutiaoxia, Shangri-la, Diqing, Yunnan, China, 27°08′43′′N, 100°33′06′′E, ca. 1800 m, 21.viii.2011, ex Impatiens sp.11 (with purple flowers), J.J. Gao ( KIZ).

Paratypes. CHINA: 5♂, 5♀ (#00090−93, #00100, #00102, #00103, #00106, #01546, #01550), same data as holotype ( KIZ, SEHU).

Distribution. China (Yunnan).

Etymology. Referring to the somewhat X-shaped (chiasma) tenth sternite (sternum).

Figures

FIGURE 39. Impatiophila chiasmosternata Fu & Gao, sp. nov. Adult male (paratype, # 00102) and female (paratype, # 00103): 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).