Impatiophila bifurcata 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 : 86-88

44) Impatiophila bifurcata Fu & Gao , sp. nov.

( Fig. 50 ; Pl. 5G; Pl. 7Q)

Diagnosis. Abdominal tergites unicolorously blackish brown (Pl. 5G). Hindleg tibia with 1 black, apically blunt, stout spine at outer apex on underside. Tenth sternite longer than twice of width, roundly convex on dorsal margin ( Fig. 50 D). Dorsomedial portion of oviscapt valve narrowly extended anteriad in lateral view ( Fig. 50 G).

Description (♂, ♀). Head: Cibarium with 3−4 medial and 5 posterior sensilla per side: posterior sensilla slightly curved anteriad and anteromost one twice as long as posteromost, medial sensillum. Labellum with 6−7 pseudotracheae per side.

Thorax (Pl. 5G): Postpronotum dark brown; scutum and scutellum glossy black; pleura dark brown to blackish brown.

Wing (Pl. 5G) hyaline; veins pale brown. C1 setae 2, subequal. Setae of middle row on 2nd costal section all weak, trichoid. Haltere pale yellow.

Legs (Pl. 5G) yellow. Hindleg tarsomeres I −IV each with 1 black, apically blunt, stout spine at outer apex on underside.

Abdomen: Sternites grayish yellow; male VI somewhat quadrate, slightly longer than wide, nearly straight or slightly concave on posterior margin.

Male terminalia ( Fig. 50 A −F): Epandrium broad, truncate on ventral margin, pubescent on dorsomedial portion, with ca. 10 long setae on ventral 2/3 and ca. 10 shorter setae on caudoventral portion. Surstylus deeply concave in ventral 2/3 of distal margin, with 1 seta in addition to 1 stout, upturned prensiseta around caudodorsal corner, 5 prensisetae along distal margin and 1 seta at ventral apex. Cercus pubescent on anteromedial portion, with ca. 18 long setae. Hypandrim twice as long as wide, slightly narrowing anteriorly. Gonopod broad, short in lateral view. Paramere somewhat roundish on apical margin, twice as long as wide, with 7 sensilla. Aedeagal basal process about 2/3 length of paramere.

Female terminalia ( Fig. 50 G, H; Pl. 7Q): Oviscapt valve yellowish brown, apically less expanded in ventral view, without distinct lateral flap, gently curved on dorsosubapical margin, distally concave on ventral margin in lateral view, with 4 dorsal ovisensilla, 8 lateral ones tightly arranged in slightly convex (in ventral view) row on margin of apicolateral portion and 8−9 ventral ones nearly constant in size and entirely arranged at nearly equal intervals; subapical trichoid ovisensillum stout, longer than apical, peg-like ovisensillum. Spermatheca capsule brown, as wide as long, apically slightly concave; introvert depth of duct about 1/3 of capsule height.

Measurements: BL = 2.25 (1♂ paratype: 1.83, 1♀ paratype: 2.45) mm, ThL = 1.06 (1.01, 1.13) mm, WL = 2.20 (2.05, 2.28) mm, WW = 1.00 (0.92, 0.99) mm.

Indices: arb = 2/1 (1♂, 1♀ paratype: 2−3/1), FW/HW = 0.46 (0.46−0.47), ch/o = 0.08 (0.09−0.13), prorb = 1.06 (0.99−1.00), rcorb = 0.94 (0.62), orbito = 1.19 (0.85−1.00), vb = 0.40 (0.35−0.36), dcl = 0.50 (0.52−0.62), dcp = 0.42 (0.39), sterno = 0.58 (0.57−0.64), m-sterno = 0.79 (0.74−0.78), sctl = 1.02 (1.04−1.07), sctlp = 1.12 (0.95−0.97), C = 2.28 (2.08−2.14), 4c = 0.89 (0.94−1.01), 4v = 1.58 (1.55−1.73), 5x = 1.74 (1.58−1.74), ac = 2.66 (2.65−3.00), M = 0.50 (0.43−0.50).

Holotype. ♂ (#01149), Jiujiezi, Baihualing Village, Mangkuan Town, Longyang County, Baoshan, Yunnan, China, ca. 1900 m, 9.x.2010, J.J. Gao ( KIZ).

Paratypes. CHINA: 1♂ (#02582), Huanglianshan Nature Reserve, Luchun, Honghe, Yunnan, 26.iv.2010, by net sweeping on herbaceous vegetation, Y.R. Su et al.; 1♀ (#01127), Hesong Village, Xiding Town, Menghai County, Xishuangbanna, Yunnan, 21°49′57′′N, 100°06′09′′E, 17.iv.2010, by net sweeping above fallen trunk along waterside, J.J. Gao ( KIZ).

Distribution. China (Yunnan).

Etymology. Referring to the oviscapt valve dorsomedially bifurcated (bi-furcatus) with anteriad extending, narrow projection.

Figures

FIGURE 50. Impatiophila bifurcata Fu & Gao, sp. nov. Adult male (holotype, # 01149) and female (paratype, # 001127): 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).