Dettopsomyia discontinua Wang & 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 discontinua Wang & Gao sp. nov.

Figure 6

Material.

Holotype: ♂ (#01585), Banpo , Yixiang , Simao, Pu’er, Yunnan, China, ca. 1300 m (22°44'N, 101°.07'E), by net sweeping above herbs, 2.x.2012 (J.J. Gao) (KIZ) . Paratypes: China: 1♂ (#01584), same data as holotype ; 5♂, 1♀ (#01139-1144), Zaotanghe, Baihualing, Baoshan , Yunnan, ca. 1540 m (25°18'N, 98°47'E), 4.viii.2012, ex small mushroom (J.J. Gao) ; 3♀, 3♂ (#01167-1169, #01172-1174), from decaying aroid ( Rhaphidophora decursiva ) infructescences collected from Baihualing, Baoshan , Yunnan, 23.ix.2012 (J.J. Gao, Z. Fu, and J.M. Chen) (KIZ, SEHU) .

Diagnosis.

This species is closely related to De. serripenis sp. nov., forming a highly supported (BP = 100) clade with it (Fig. 1 ). These two species are indistinguishable in CS-code from each other: De. discontinua sp. nov. (AbCD?FGHiJKLM) and De. serripenis sp. nov. (AbCD??GHiJK?M). However, they can be easily distinguished from each other by the following characters: 1) cercus caudoventrally strongly sclerotized and protruded ventrad like finger (Fig. 6F ) in De. discontinua sp. nov. (abbreviated Dd here), but only pointed at caudoventral corner (Fig. 5F ) in De. serripenis sp. nov. (abbreviated Ds); 2) surstylus with approximately 11 prensisetae on distal margin and nine or ten ones on medial portion of outer surface, arranged together nearly in circle (Fig. 6F, G ) in Dd, but with 14 or 15 prensisetae arranged in V-shape (Fig. 5F, G ) in Ds; and 3) marginal peg-like ovisensilla in row interrupted around subterminal, long, trichoid seta (Fig. 6J, K ) in Dd, but in continuous row (Fig. 5J, K ) in Ds.

Description.

(♂, ♀; not repeating characters common to De. serripenis sp. nov.). Head (Fig. 6A, B ): Frons with black stripes. Gena yellow. Palpus grayish yellow.

Thorax (Fig. 6A, B ): Scutum, scutellum, and thoracic pleura with color patterns similar to those of De. serripenis sp. nov. Acrostichal setulae in two rows. Basal scutellar setae slightly converged.

Wing (Fig. 6C ): Wing maculated as in De. serripenis sp. nov.

Legs (Fig. 6A ) pale grayish yellow.

Abdomen (Fig. 6D, E ): Tergites blackish brown to black; II-V each laterally with a pale brown spot per side.

Male terminalia (Fig. 6F-I ): Epandrium pubescent on mediolateral portion only, with one seta per side on mediolateral portion; ventral lobe not differentiated; apodeme narrow, somewhat triangular. Surstylus somewhat quadrate, large plate, with one trichoid seta and 10-11 prensisetae in sinuated row on outer surface and 6-8 prensisetae decreasing in size downward on caudal margin. Cercus unpubescent, with approximately 33 setae. Hypandrium somewhat hemicircular; apodeme slightly wider than long. Aedeagus subapically with a pair of triangular lateral flaps; apodeme shorter than aedeagus.

Female terminalia (Fig. 6J-L ): Oviscapt with three trichoid lateral ovisensilla, 14-16 peg-like marginal ovisensilla and one subterminal, trichoid, long seta; distal portion approximately 1/3 of whole length, nearly flat on dorsal margin in lateral view.

Measurements: BL = 1.50 mm in holotype (range in 5♂ paratypes: 1.42-1.67 mm; range in 4♀ paratypes: 1.57-1.75 mm); ThL = 0.52 (0.55-0.64; 0.55-0.68) mm; WL = 1.30 (1.26-1.37; 1.36-1.58) mm; WW = 0.66 (0.62-0.70; 0.63-0.80) mm.

Indices: arb = 4 or 5/2 (range in 5♂, 4♀, or less if noted, paratypes: 4/2), FW/HW = 0.60 (0.57-0.61), ch/o = 0.38 (0.35-0.49), prorb = 0.72 (0.59-0.77), rcorb = 0.14 (0.16-0.21), vb = 0.32 (0.22-0.46), dcl = 0.74 (0.72-0.85), sctl = 0.98 (0.95-1.12), sterno = 0.73 (0.44-0.64), orbito = 0.19 (0.25-0.32), dcp = 0.65 (0.65-1.08), sctlp = 1.06 (0.95-1.14), C = 0.88 (0.90-0.96), 4c = 2.53 (2.11-2.34), 4v = 2.39 (1.93-2.30), 5 × = 2.04 (1.63-2.09), ac = 3.18 (2.68-3.06), M = 0.93 (0.78-0.85), C3F = 0.58 (0.42-0.63).

Distribution.

China (Yunnan).

Etymology.

Referring to the interruptedly arranged marginal ovisensilla.

Figures

Figure 1. An un-rooted, neighbor-joining tree built with DNA barcodes (mitochondrial COI sequences) of six Dettopsomyia species. Label of each operational taxonomic unit (OTU) is given in the format of " voucher number (sex) ". Node confidences (i. e., bootstrap percentages from 1000 replicates) ≥ 50 % are shown.

Figure 5. Dettopsomyia serripenis Wang & Gao, sp. nov. (A-I # 00152, J-L paratype # 00156) 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 (dorsolateral view) J oviscapt (lateral view) K oviscapt (ventral view) L spermatheca. Scale bars: 1.0 mm (photograph) or 0.1 mm (line drawing).

Figure 6. Dettopsomyia discontinua Wang & Gao, sp. nov. (A-I # 01585, J-L paratype # 01168) 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 (dorsolateral view) J oviscapt (lateral view) K oviscapt (ventral view) L spermatheca. Scale bars: 1.0 mm (photograph) or 0.1 mm (line drawing).