Stegana (Orthostegana) brevivittata 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

3.2.1.2. Stegana (Orthostegana) brevivittata Peng & Chen sp. nov.

Figs 5E-H , 9H , 13

Diagnosis.

This species closely resembles S. (O.) cuodi sp. nov. in the shape of male terminalia (Figs 13 , 14 ), but can be distinguished from the latter by having the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 14/3+1 spines; 2nd to 4th segments with 5/1, 2/1, and 2/1 spines, respectively (Fig. 9H ); pregonite with ca. 3 sensilla distally (Fig. 13C, D ).

Description.

Male. Head: Ocellar triangle brown, with 2 small setae posterior to ocellar setae. Postocellar seta absent. Frons brownish yellow, with numerous minute interfrontal setulae. Pedicel yellow; first flagellomere dark brown distally, with black pubescence. Face yellow. Gena brownish yellow. Clypeus dark brown medially and brownish yellow laterally. Palpus yellow. Thorax: Mesonotum yellow (Fig. 5E, G ). Pleura with a distinct brown to dark brown longitudinal stripe above (Fig. 5F, H ). Scutellum mostly yellow (Fig. 5E, G ). Halter mostly brownish, with a yellow patch at knob (Fig. 5E-H ). Legs yellowish (Fig. 9H ). Abdominal tergites: brownish yellow to brownish. Male terminalia: Epandrium mostly pubescent except for anterior margin, with ca. 19 setae on dorsal to posterior portions per side (Fig. 13A ). Surstylus separated from epandrium, narrowed dorsally, with ca. 14 long and 8 short peg-shaped prensisetae near anterodorsal margin on inner surface and a few setae ventrally (Fig. 13B ). Pregonites fused basally (Fig. 13C, D ). Aedeagus pubescent distally, with some hairs medioventrally and apically (Fig. 13C, D ).

Measurements and indices.

BL = 2.77 mm in holotype (range in 5♂ paratypes: 2.53-3.07), ThL = 1.10 mm (1.07-1.20), WL = 2.03 mm (2.03-2.30), WW = 0.97 mm (0.87-1.17), arb = 5/4 (5-9/3-6), avd = 0.92 (0.75-0.92), adf = 2.00 (1.67-2.00), flw = 2.17 (1.83-2.00), FW/HW = 0.39 (0.38-0.49), ch/o = 0.12 (0.09-0.13), prorb = 1.00 (0.80-1.23), rcorb = 0.67 (0.55-0.79), vb = 0.67 (0.44-0.58), dcl = 0.46 (0.32-0.61), presctl = 0.42 (0.32-0.44), sctl = damaged (1.26-1.45), sterno = 063 (0.59-0.81), orbito = 1.00 (1.33-2.25), dcp = 0.25 (0.26-0.32), sctlp = 1.00 (0.79-1.20), C = 2.06 (2.19-2.86), 4c = 0.94 (0.78-0.84), 4v = 1.67 (1.53-1.76), 5x = 1.33 (0.93-1.40), ac = 11.33 (7.00-13.33), M = 0.44 (0.33-0.44), C3F = 0.76 (0.76-0.82).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112200), China: Muyiji Park, Ximeng, Yunnan, 22°37′15″N, 99°35′42″ E, altitude 1203 m, 29.iv.2016, swept from tree trunk, J. Huang. Paratypes: 3♂ (SCAU, Nos. 112201-03), Y.Q. Liu, Y.L. Wang, L. Zhu, other data same as the holotype; 2♂ (SCAU, Nos. 112204, 05), Likan, Ximeng, Yunnan, 22°39′21″N, 99°36′28″E, altitude 844 m, 1.v.2016, swept from tussocks, J. Huang; 2♀ (SCAU, Nos. 112206, 07), Mengdong, Cangyuan, Yunnan, 23°10′08″N, 99°13′52″E, altitude 1320 m, 6.v.2016, swept from tussocks, Y.Q. Liu, Y.L. Wang; 1♂ (SCAU, No. 112208), Muyiji Park, Ximeng, Yunnan, 22°37′15″N, 99°35′42″E, altitude 1100 m, 16.iv.2018, swept from tussock, Y.L. Wang.

Etymology.

A combination of the Latin words " brevis " (= short) and " vittatus " (= stripe), referring to the pleura with a brown longitudinal stripe above.

Figures

Figure 5. Head, thorax, and abdomen in dorsal and lateral views. A, B Stegana (Orthostegana) aini Peng & Chen sp. nov. (male); C, D S. (O.) aini Peng & Chen sp. nov. (female); E, F S. (O.) brevivittata Peng & Chen sp. nov. (male); G, H S. (O.) brevivittata Peng & Chen sp. nov. (female). Scale bar = 1 mm.

Figure 9. Mesotarsus of males in ventral view. A Stegana (Orthostegana) curvinervis (Hendle, 1914); B S. (O.) singularis (Sidorenko, 1990); C S. (O.) flavicauda Zhang and Chen, 2012; D S. (O.) hirsutina Zhang and Chen, 2012; E S. (O.) hylecoeta Zhang and Chen, 2012; F S. (O.) multicardua Zhang and Chen, 2012; G S. (O.) aini Peng & Chen sp. nov.; H S. (O.) brevivittata Peng & Chen sp. nov.; I S. (O.) cuodi Peng & Chen sp. nov.; J S. (O.) fuscofemorata Peng & Chen sp. nov. Scale bar = 0.2 mm.

Figure 13. Stegana (Orthostegana) brevivittata Peng & Chen sp. nov., male terminalia. A Epandrium, surstylus, and cercus in lateral view; B Surstylus in ventral view; C, D Hypandrium, phallapodeme, pregonite, aedeagus, and aedeagal sheath in ventral and lateral views. Scale bars = 0.1 mm.

Figure 14. Stegana (Orthostegana) cuodi Peng & Chen sp. nov., male terminalia. A Epandrium, surstylus, and cercus in lateral view; B Surstylus in ventral view; C, D Hypandrium, phallapodeme, pregonite, aedeagus, and aedeagal sheath in ventral and lateral views. Scale bars = 0.1 mm.