Stegana (Orthostegana) aini 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/7A71D0C6-DF96-4442-999B-EC0AF4411096
taxon LSID	lsid:zoobank.org:act:7A71D0C6-DF96-4442-999B-EC0AF4411096
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Stegana (Orthostegana) aini Peng & Chen
status	sp. nov.

Treatment

3.2.1.1. Stegana (Orthostegana) aini Peng & Chen sp. nov.

Figs 5A-D View Figure 5 , 9G View Figure 9 , 12 View Figure 12

Diagnosis.

This species closely resembles S. (O.) obscurala 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 mostly yellow, lacking distinct longitudinal stripe above (Fig. 5B, D View Figure 5 ); the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 15/2+1 spines; 2nd to 4th segments with 5/1, 1/1, and 2/1 spines, respectively (Fig. 9G View Figure 9 ); pregonite with ca. 5 sensilla distally (Fig. 12C, D View Figure 12 ).

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 yellow. Gena yellow, with brown stripes. Clypeus mostly yellow. Palpus yellow. Thorax: Mesonotum mostly yellow to brownish yellow (Fig. 5A, C View Figure 5 ). Scutellum yellow in males (Fig. 5A View Figure 5 ), brownish in females (Fig. 5C View Figure 5 ). Halter mostly brownish, with a yellow patch at knob (Fig. 5A-D View Figure 5 ). Legs yellow (Fig. 9G View Figure 9 ). Abdominal tergites: brown to dark brown. Male terminalia: Epandrium mostly pubescent except for anterior and ventral margins, with ca. 30 setae on dorsal to posterior portions per side (Fig. 12A View Figure 12 ). Surstylus separated from epandrium, with ca. 4 long and 19 short peg-shaped prensisetae and some setae near posteroventral margin on inner surface (Fig. 12B View Figure 12 ). Pregonites separated and small, slightly expanded distally (Fig. 12C, D View Figure 12 ). Aedeagus pubescent distally, with some hairs apically (Fig. 12C, D View Figure 12 ). Female terminalia: Eighth sternite with 3 rows of orderly and asymmetrical peg-shaped prensisetae subposteromedially and posterolaterally, and with 3 sensilla distally per side (Fig. 12E View Figure 12 ).

Measurements and indices.

BL = 3.40 mm in holotype (range in 3♂ and 5♀ paratypes: 2.80-3.87 in ♂, 3.13-4.20 in ♀), ThL = 1.67 mm (1.60-1.80 in ♂, 1.60-1.80 in ♀), WL = 3.40 mm (2.80-4.13 in ♂, 3.13-4.00 in ♀), WW = 1.33 mm (1.20-1.53 in ♂, 1.20-1.40 in ♀), arb = 4/3 (4-5/2-3), avd = 0.71 (0.60-1.00), adf = 1.71 (1.33-2.25), flw = 1.50 (1.50-2.75), FW / HW = 0.37 (0.33-0.40), ch/o = 0.09 (0.07-0.13), prorb = 0.82 (0.63-0.89), rcorb = 0.59 (0.37-0.63), vb = 0.67 (0.67-0.88), dcl = 0.30 (0.32-0.40), presctl = 0.46 (0.36-0.50), sctl = 1.07 (0.86-1.35), sterno = 0.53 (0.43-1.00), orbito = 1.80 (2.00-2.50), dcp = 0.23 (0.25-0.36), sctlp = 1.10 (1.10-1.44), C = 2.40 (1.28-3.00), 4c = 0.83 (0.75-1.64), 4v = 1.67 (1.45-2.23), 5x = 1.00 (0.60-1.25), ac = 5.40 (5.00-7.20), M = 0.42 (0.25-0.42), C3F = 0.60 (0.60-1.25).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112183), CHINA: Hesong, Menghai, Yunnan, 21°50′17″N, 100°05′48″E, altitude 1600 m, 11.v.2012, swept over tussock, H.W. Chen. - Paratypes: 3♂, 13♀ (SCAU, Nos. 112184-99), altitudes 1600-1900 m, 6-11.v.2012, other data same as the holotype.

Etymology.

From the word " aini " of the Aini nationality living in Yunnan, China.