Stegana (Orthostegana) mohnihei 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/323D4AE6-A774-4022-842B-11B333E48EC5
taxon LSID	lsid:zoobank.org:act:323D4AE6-A774-4022-842B-11B333E48EC5
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Stegana (Orthostegana) mohnihei Peng & Chen
status	sp. nov.

Treatment

3.2.1.7. Stegana (Orthostegana) mohnihei Peng & Chen sp. nov.

Figs 7G View Figure 7 , 7H View Figure 7 , 8A View Figure 8 , 8B View Figure 8 , 10C View Figure 10 , 18 View Figure 18

Diagnosis.

This species closely resembles S. (O.) flavicauda sp. nov. in the shape of both male and female terminalia (as fig. 5 in Zhang et al. 2012, Fig. 18 View Figure 18 ), but can be distinguished from the latter by having the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 14/1+1 spines; 2nd to 4th segments with 2/1, 1/1, and 2/1 spines, respectively (Fig. 10C View Figure 10 ); surstylus with ca. 20 long and 15 short peg-shaped prensisetae near anterior and ventral margins on inner surface (Fig. 18B View Figure 18 ).

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 brown, with 1 small seta; first flagellomere dark brown, with black pubescence. Face and gena brownish. Clypeus mostly brown. Palpus brownish yellow. Thorax: Mesonotum yellow to brownish yellow (Figs 7G View Figure 7 , 8A View Figure 8 ). Pleura with a distinct brownish longitudinal stripe above (Figs 7H View Figure 7 , 8B View Figure 8 ). Scutellum yellow to brownish yellow (Figs 7G View Figure 7 , 8A View Figure 8 ). Halter mostly brownish, with a yellow patch at knob (Figs 7G View Figure 7 , 7H View Figure 7 , 8A View Figure 8 , 8B View Figure 8 ). Legs yellowish (Fig. 10C View Figure 10 ). Abdominal tergites: brownish yellow to brownish. Male terminalia: Epandrium mostly pubescent except for anterior margin, with ca. 26 setae on dorsal to posterior portions per side (Fig. 18A View Figure 18 ). Surstylus separated from epandrium, with a few setae near ventral margin (Fig. 18B View Figure 18 ). Pregonites separated and small, with ca. 3 or 4 sensilla distally (Fig. 18C, D View Figure 18 ). Aedeagus pubescent distally and medioventrally, with some hairs medioventrally and apically (Fig. 18C, D View Figure 18 ). 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. 18E View Figure 18 ).

Measurements and indices.

BL = 3.24 mm in holotype (range in 5♂ and 5♀ paratypes: 3.11-3.42 in ♂, 3.02-3.78 in ♀), ThL = 1.33 mm (1.20-1.33 in ♂, 1.24-1.69 in ♀), WL = 2.67 mm (2.37-2.57 in ♂, 2.60-3.07 in ♀), WW = 1.23 mm (1.00-1.13 in ♂, 1.13-1.40 in ♀), arb = 6/4 (6/4-5), avd = 0.89 (0.89-1.00), adf = 1.50 (1.40-2.00), flw = 2.67 (2.67-3.25), FW/HW = 0.41 (0.38-0.42), ch/o = 0.11 (0.10-0.14), prorb = 0.80 (0.80-0.93), rcorb = 0.60 (0.67-0.76), vb = 0.42 (0.43-0.57), dcl = 0.38 (0.38-0.56), presctl = 0.42 (0.38-0.50), sctl = 1.20 (1.21-1.33), sterno = 0.75 (0.80-0.94), orbito = 2.00 (1.75-2.00), dcp = 0.30 (0.23-0.33), sctlp = 1.00 (0.88-1.13), C = 2.53 (2.19-2.47), 4c = 0.79 (0.82-0.92), 4v = 1.54 (1.55-1.81), 5x = 1.13 (1.00-1.43), ac = 12.67 (10.00-12.67), M = 0.38 (0.30-0.46), C3F = 0.63 (0.63-0.74).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112130), China: Mengdong, Cangyuan, Yunnan, 23°10′08″N, 99°13′52″E, altitude 1320 m, 6.v.2016, swept from tussock, J. Huang. Paratypes: 21♂, 20♀ (SCAU, Nos. 112131-71), altitudes 1320-1323 m, J. Huang, Y.Q. Liu, Y.L. Wang, L. Zhu, other data same as the holotype; 6♀ (SCAU, Nos. 112172-77), Muyiji Park, Ximeng, Yunnan, 22°37′15″N, 99°35′42″ E, altitude 1203 m, 29.iv.2016, swept from tree trunks, J. Huang, Y.Q. Liu, Y.L. Wang, L. Zhu; 3♀ (SCAU, Nos. 112178-80), Muyiji Park, Ximeng, Yunnan, 22°37′15″N, 99°35′42″E, altitude 1100 m, 16.iv.2018, swept from tussocks, Y.L. Wang; 1♂, 1♀ (SCAU, Nos. 112181, 82), Baihualing, Baoshan, Yunnan, 25°17′53″N, 98°48′09″E, altitude 1370 m, 15.vi.2011, swept from tussocks, J.J. Gao.

Etymology.

From the word " mohnihei " in Va language from the Va nationality living in Yunnan, China, referring to a carnival for them.