Impatiophila eretmosternata 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 : 32

5) Impatiophila eretmosternata Fu & Gao , sp. nov.

( Fig. 15 ; Pl. 1D; Pl. 6D)

Diagnosis. Scutum and scutellum with distinct color pattern (Pl. 1D). Setae of middle row on 2nd costal section all weak, trichoid. Hindleg tibia without black, apically blunt, stout spine at outer apex on underside. Epandrium posteriorly pubescent in patches on dorsal 1/2 ( Fig. 15 A). Oviscapt valve distally concave on ventral margin in lateral view, with 12‒13 lateral ovisensilla ( Fig. 15 G, H).

Description (♂, ♀). Head: Cibarium with 1–3 medial and 4–6 posterior sensilla per side.

Thorax (Pl. 1D): Postpronotum pale brown; scutum blackish brown, pale along transverse suture and along lines running through ipsilateral, dorsocentral setae; scutellum brown, pale laterally; pleura pale brown.

Wing (Pl. 1D) hyaline; veins yellow. C1 setae 2; ventral one thinner and shorter. Haltere pale yellow.

Legs (Pl. 1D) yellow. Hindleg tibia without black, apically blunt, stout spines at outer apex on underside.

Abdomen (Pl. 1D): Tergites each with broad, blurred, pale brown, caudal band; bands on II −IV medially more or less notched or interrupted, laterally narrowed. Sternites pale yellow; male VI somewhat quadrate, slightly longer than wide, nearly straight or slightly concave on posterior margin.

Male terminalia ( Fig. 15 A −F): Epandrium ventrally with ca. 16 long setae; caudoventral portion somewhat triangular, with a patch of ca. 15 short, stout setulae. Surstylus with 1 long seta in addition to 1 stout, upturned prensiseta at caudodorsal corner, 5 apically converging prensisetae along distal margin and 1 long seta near ventral apex. Tenth sternite roundly convex on both dorsal and ventral margins, longer than twice of width. Cercus sparsely pubescent, with ca. 21 long setae. Hypandrium slightly dilated posteriorly, roundish on anterior margin. Paramere nearly straight in lateral view, longer than twice of width in lateral view, with 7 sensilla. Gonopod apically triangular in lateral view. Aedeagal basal process slightly longer than 1/2 length of paramere.

Female terminalia ( Fig. 15 G, H; Pl. 6D): Oviscapt valve gently curved on dorsosubapical margin and less expanded dorsomedially in lateral view, with 6−8 dorsal ovisensilla and 11–13 ventral ones nearly constant in size. Spermathecal capsule brown; introvert depth of duct about 1/3 of capsule height.

Measurements: BL = 2.21 (1♀ paratype: 2.38) mm, ThL = 1.08 (1.06) mm, WL = 2.59 (2.57) mm, WW = 1.15 (1.16) mm.

Indices: arb = 2−3/1 (1♀ paratype: 2−3/1), FW/HW = 0.44 (0.45), ch/o = 0.14 (0.12), prorb = 1.07 (1.10), rcorb = 0.77 (0.75), orbito = 1.16 (1.06), vb = 0.46 (0.41), dcl = 0.56 (0.52), dcp = 0.42 (0.33), sterno = 0.68 (0.60), m-sterno = 0.74 (0.72), sctl = 1.04 (1.00), sctlp = 1.15 (1.10), C = 2.28 (2.65), 4c = 0.93 (0.86), 4v = 1.63 (1.67), 5x = 1.40 (1.48), ac = 2.70 (2.63), M = 0.44 (0.49).

Holotype. ♂ (#00515), along the way from the Lage Village, Baiba Town, Linzhi County to the Hanmi Village, Beibeng Town, Motuo County, Linzhi District, Xizang, China, 25.ix.2010, ex Impatient desmantha Hook. f. ( Fig. 1 C), J.J. Gao ( KIZ).

Paratype. CHINA: 1♀ (#00310), same data as holotype ( KIZ).

Distribution. China (Xizang).

Etymology. Referring to the remiform (eretmo-) tenth sternite (sternum).

Remarks. The dark pigmentation on the scutum, scutellum, thoracic pleura and abdominal tergites is weaker in the holotype (#00515) than in the paratype (#00310); moreover, in the holotype, an additional, blurred central stripe is present on the scutum (lacking in the paratype), and the lateral stripes run through the notum (slightly extending to the anterior dorsocentral setae in the paratype). These differences are probably due to the difference in age between the two specimens; the holotype seems to be younger than the paratype. The two specimens were collected from the same plant at the same locality, and their COI K2P genetic distance was very low (0.0016). Therefore, we regarded them as conspecific.

Figures

FIGURE 1. Flowers from which some of the BVD (Impatiophila gen. nov.) flies employed in the present study were collected. Sites of photographing are given in parentheses (see Fig. 2 for detailed information about each site). A, Impatiens siculifer Hook. f. (site 3); B, Impatiens sp. aff. bahanensis Hand. - Mazz (site 2); C, Impatient desmantha Hook. f. (site 1), D, Impatiens arguta Hook. f. et. Thoms. (site 4); E, Impatiens radiata Hook. f. (site 10); F, Impatiens racemosa (site 17); G, Gesneriaceae sp. 1 (site 22); H, Impatiens siculifer Hook. f. (site 6); I, Impatiens uniflora Hayata (site 23); J, Gesneriaceae sp. 2 (site 6).

FIGURE 15. Impatiophila eretmosternata Fu & Gao, sp. nov. Adult male (holotype, # 00515) and female (paratype, # 00310): 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).