Dettopsomyia paranigrovittata Wang, Li & Gao, 2021

Wang, Ya-Lian, Li, Qiao, Toda, Masanori J. & Gao, Jian-Jun, 2021, The genus Dettopsomyia Lamb, 1914 (Diptera, Drosophilidae) from southern China, ZooKeys 1056, pp. 73-94 : 73

Dettopsomyia paranigrovittata Wang, Li & Gao sp. nov.

Figure 8

Materials.

Holotype: ♂ (#01145), ex. inflorescence of Rh. decursiva , Laomengzhai , Baihualing, Baoshan, Yunnan, China, ca. 1500 m (25°17'N, 98°48'E), 3.viii.2012 (J.J. Gao) (KIZ) . Paratype: China: 1♂ (#01579), emerged (together with many adults of De. nigrovittata ) from decaying spathes of Rh. decursiva collected from Laomengzhai, Baihualing, Baoshan , Yunnan (same as holotype) and cultured in laboratory, 23.ix.2012 (J.J. Gao, Z. Fu, J.M. Chen) (KIZ) .

Diagnosis.

This species closely resembles De. nigrovittata in the external morphology and male terminalia, but can be distinguished from it by the surstylus chaetotaxy: in De. paranigrovittata sp. nov., approximately 23 subequal, peg-like prensisetae arranged roughly in five sets on medial to distal portion of outer surface and two upward-curved, trichoid setae on subventral portion of inner surface (Fig. 8F, G ); but in De. nigrovittata , approximately 25 more or less heteromorphic setae arranged in three rows on upper half of outer surface and two larger setae at lower tip ( Okada 1956: fig. 31C, as De. argentifrons ).

Description.

(♂; not repeating characters common to De. acutipenis sp. nov.). Head (Fig. 8A, B ): Eye nearly rectangular to body axis. Fronto-orbital plate yellowish brown. Frons and frontal vittae grayish brown, somewhat shining. Face grayish yellow, black at middle and lateral sides; carina grayish yellow, rather prominent. Gena blackish brown, with pale spots antero- and medio-dorsally. Palpus grayish yellow, with large black spot. Antennal pedicel grayish yellow; 1st flagellomere dark gray. Subvibrissal seta short.

Thorax (Fig. 8A, B ): Scutum blackish brown to black, with four narrow, silver stripes; scutellum and thoracic pleura blackish brown. Acrostichal setulae in six rows. Dorsocentral setae two pairs. Basal scutellar setae divergent.

Wing (Fig. 8C ) hyaline. Veins pale brown. R2+3 nearly straight; R4+5 and M1 distally parallel. Haltere pale whitish to grayish yellow.

Legs (Fig. 8A ) pale brown to blackish brown.

Abdomen (Fig. 8D, E ): Tergites entirely black.

Male terminalia (Fig. 8F-I ): Epandrium pubescent on lateral to dorsal portion, with one and two setae per side on sub-dorsal and -ventral portions, respectively; ventral lobe distally with five long, trichoid setae; apodeme on anterior margin. Surstylus somewhat triangular, large plate. Cercus broadly fused to epandrium, somewhat roundish at caudoventral corner, entirely pubescent, with approximately 36 setae. Hypandrium anteriorly slightly narrower, caudomedially notched. Paramere fused to hypandrium, densely pubescent, apically with one minute setula. Aedeagus curved ventrad proximally but dorsad distally, distally narrowing like horn in lateral view, ventro-subapically with large, oval gonopore; apodeme slightly shorter than aedeagus.

Measurements: BL = 1.69 mm in holotype (1♂ paratype: 1.52 mm); ThL = 0.68 (0.65) mm; WL = 1.50 (1.40) mm; WW = 0.74 (0.71) mm.

Indices: arb = 4/2 (1♂ paratype: 4/2), FW/HW = 0.56 (0.55), ch/o = 0.36 (0.41), prorb = 0.68 (0.73), rcorb = n/a (0.32), dcl = 0.71 (0.71), sctl = 0.83/(0.85), sterno = n/a (0.61), orbito = 0.57 (0.52), dcp = 0.80 (0.83), sctlp = 0.91 (0.92), C = 1.36 (1.23), 4c = 1.94 (2.20), 4v = 2.92 (3.15), 5 × = 3.20 (2.67), ac = 4.73 (3.89), M = 1.23 (1.25), C3F = 0.60 (0.65).

Distribution.

China (Yunnan).

Etymology.

Referring to the close morphological affinity to De. nigrovittata .

Figures

Figure 8. Dettopsomyia paranigrovittata Wang, Li & Gao, sp. nov. (A-I # 01145) A left lateral habitus B head and thorax (dorsal view) C wing (right, dorsal view) D abdomen (lateral view) E abdomen (dorsal view) F periphallic organs (posterolateral view) G surstylus H phallic organs (ventral view) I phallic organs (ventrolateral view). Scale bars: 1.0 mm (photograph) or 0.1 mm (line drawing).