Stegana (Orthostegana) obscurala Peng & Chen, 2023

Wang, Ya-Lian, Peng, Zi-Qi, Jin, Feng-Liang, Chen, Hong-Wei & Huang, Jia, 2023, Integrative species delimitation in the morphologically conservative Stegana subgen. Orthostegana (Diptera, Drosophilidae), Arthropod Systematics & amp; Phylogeny 81, pp. 581-610 : 581

publication ID	https://dx.doi.org/10.3897/asp.81.e102683
publication LSID	lsid:zoobank.org:pub:CA56E9F0-B426-4014-B20B-D7C455FD65A7
persistent identifier	https://treatment.plazi.org/id/89E07D8B-C1BF-42AF-AF97-26E1D29ED9BF
taxon LSID	lsid:zoobank.org:act:89E07D8B-C1BF-42AF-AF97-26E1D29ED9BF
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Stegana (Orthostegana) obscurala Peng & Chen
status	sp. nov.

Treatment

3.2.1.8. Stegana (Orthostegana) obscurala Peng & Chen sp. nov.

Figs 8C-F View Figure 8 , 10D View Figure 10 , 19 View Figure 19

Diagnosis.

This species closely resembles S. (O.) aini sp. nov. in the shape of both male and female terminalia (Figs 12 View Figure 12 , 19 View Figure 19 ), but can be distinguished from the latter by having the pleura with a distinct brown to dark brown longitudinal stripe above (Fig. 8D, F View Figure 8 ); the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 12/6+1 spines; 2nd to 4th segments with 6/1, 3/1, and 2/1 spines, respectively (Fig. 10D View Figure 10 ); pregonite with ca. 3 sensilla distally (Fig. 19C, D View Figure 19 ).

Description.

Male and female. Head: Ocellar triangle dark brown, with 2 small setae posterior to ocellar setae. Postocellar seta absent. Frons brown, with numerous minute interfrontal setulae. Pedicel and first flagellomere yellow, with black pubescence. Face brown, with narrowed, black band on lower margin. Gena brownish. Clypeus mostly brownish. Palpus brownish. Thorax: Mesonotum mostly yellow to brown (Fig. 8C, E View Figure 8 ). Scutellum yellow in males (Fig. 8C View Figure 8 ), dark brown in females (Fig. 8E View Figure 8 ). Halter mostly brownish, with a yellow patch at knob (Fig. 8D-F View Figure 8 ). Legs yellowish (Fig. 10D View Figure 10 ). Abdominal tergites: brown to black. Male terminalia: Epandrium mostly pubescent except for anterior and ventral margins, with ca. 20 setae on dorsal to posterior portions per side (Fig. 19A View Figure 19 ). Surstylus separated from epandrium, with ca. 2 long and 10 short peg-shaped prensisetae and a few setae near posteroventral margin (Fig. 19B View Figure 19 ). Pregonites separated and small, slightly expanded distally (Fig. 19C, D View Figure 19 ). Aedeagus pubescent distally, with some hairs apically (Fig. 19C, D View Figure 19 ). Female terminalia: Eighth sternite with 4 rows of asymmetrical peg-shaped prensisetae subposteromedially and posterolaterally, and with 3 sensilla distally per side (Fig. 19E View Figure 19 ).

Measurements and indices.

BL = 3.13 mm in holotype (range in 2♂ and 2♀ paratypes: 2.60-3.00 in ♂, 2.87-4.21 in ♀), ThL = 1.37 mm (1.00-1.13 in ♂, 1.07-1.60 in ♀), WL = 2.33 mm (1.90-2.17 in ♂, 2.20-2.77 in ♀), WW = 1.03 mm (0.93-0.97 in ♂, 1.00-1.27 in ♀), arb = 6/5 (6-7/4-6), avd = 0.92 (0.88-0.92), adf = 1.71 (1.71-2.13), flw = 1.86 (2.00-2.17), FW/HW = 0.38 (0.32-0.40), ch/o = 0.15 (0.13-0.16), prorb = 0.90 (0.82-0.90), rcorb = 0.50 (0.50-0.65), vb = 0.41 (0.40-0.75), dcl = 0.54 (0.38-0.50), presctl = 0.39 (0.40-0.50), sctl = 1.33 (1.33-1.50), sterno = 0.84 (0.77-0.84), orbito = 1.80 (1.67-2.00), dcp = 0.24 (0.22-0.29), sctlp = 0.90 (0.89-1.17), C = 2.75 (2.20-2.50), 4c = 0.84 (0.84-1.00), 4v = 1.79 (1.63-1.84), 5x = 1.29 (1.25-1.50), ac = 16.00 (13.33-16.00), M = 0.47 (0.42-0.53), C3F = 0.75 (0.69-0.76).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112125), China: Wangtianshu, Mengla, Yunnan, 21°37′10″N, 101°35′17″E, altitude 570 m, 9.v.2012, swept from tussock, H.W. Chen. Paratypes: 2♂, 2♀ (SCAU, Nos. 112126-29), H.W. Chen, J.J. Gao, other data same as the holotype.

Etymology.

From the Latin word " obscurus " (= obscure), referring to the mostly dark-colored abdominal tergites.