Stegana (Orthostegana) fuscofemorata 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

3.2.1.4. Stegana (Orthostegana) fuscofemorata Peng & Chen sp. nov.

Figs 6E-H , 9J , 15

Diagnosis.

This species closely resembles S. (O.) brevivittata sp. nov. in the shape of male terminalia (Figs 13 , 15 ), but can be distinguished from the latter by having the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 12/3+1 spines; 2nd to 4th segments with 3/1, 2/1, and 2/1 spines, respectively (Fig. 9J ). Surstylus with some setae near ventral margin on inner surface (Fig. 15B ).

Description.

Male and female. Head: Ocellar triangle brown to dark brown, with 2 small setae posterior to ocellar setae. Postocellar seta absent. Frons brownish yellow to brown, with numerous minute interfrontal setulae. Pedicel yellow; first flagellomere dark brown distally, with black pubescence. Face and gena brown to dark brown. Clypeus dark brown medially and brownish yellow laterally. Palpus brown. Thorax: Mesonotum brownish yellow to brown (Fig. 6E, G ). Pleura with a distinct brown to dark brown longitudinal stripe above (Fig. 6F, H ). Scutellum mostly brownish yellow to brown (Fig. 6E, G ). Halter mostly brownish, with a yellow patch at knob (Fig. 6E-H ). Legs yellowish (Fig. 9J ). Abdominal tergites: brownish to brown. Male terminalia: Epandrium mostly pubescent except for anterior margin, with ca. 16 setae on dorsal to posterior portions per side (Fig. 15A ). Surstylus separated from epandrium, narrowed dorsally, with ca. 14 long peg-shaped prensisetae near anterodorsal margin on inner surface (Fig. 15B ). Pregonites fused basally, with ca. 3 sensilla distally per side (Fig. 15C, D ). Aedeagus pubescent distally, with some hairs ventrally and apically (Fig. 15C, D ).

Measurements and indices.

BL = 3.20 mm in holotype (range in 4♂ and 3♀ paratypes: 3.00-3.13 in ♂, 3.00-3.10 in ♀), ThL = 1.39 mm (1.27-1.30 in ♂, 1.20-1.27 in ♀), WL = 2.20 mm (2.17-2.30 in ♂, 2.30-2.53 in ♀), WW = 1.03 mm (1.03-1.07 in ♂, 1.03-1.23 in ♀), arb = 7/4 (6-7/4-5), avd = 0.79 (0.80-0.85), adf = 2.00 (1.71-2.17), flw = 2.14 (1.17-2.33), FW/HW = 0.40 (0.35-0.40), ch/o = 0.13 (0.13), prorb = 0.95 (0.81-1.05), rcorb = 0.71 (0.68-0.75), vb = 0.67 (0.40-0.67), dcl = 0.48 (0.40-0.50), presctl = 0.48 (0.44-0.53), sctl = 1.19 (1.31-1.48), sterno = 0.78 (0.62-0.81), orbito = 2.00 (2.00-2.25), dcp = 0.24 (0.23-0.26), sctlp = 0.92 (0.91-1.10), C = 2.22 (2.15-2.41), 4c = 0.95 (0.81-0.95), 4v = 1.68 (1.63-1.65), 5x = 1.14 (1.13-1.14), ac = 12.00 (10.00-12.00), M = 0.42 (0.38-0.43), C3F = 0.72 (0.72-0.83).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112117), 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: 1♂ (SCAU, No. 112118), Y.L. Wang, other data same as the holotype; 3♂, 1♀ (SCAU, Nos. 112119-22), Menglun, Mengla, Yunnan, 21°55′11″N, 101°16′40″ E, altitudes 800-900 m, 13.ix.2002, swept from tree trunks, H.W. Chen; 1♀ (SCAU, No. 112123), Baihualing, Baoshan, Yunnan, 25°17′53″N, 98°48′09″E, altitude 1370 m, 15.vi.2011, swept from tree trunk, J.J. Gao; 1♀ (SCAU, No. 112124), Wangtianshu, Mengla, Yunnan, 21°37′10″N, 101°35′17″E, altitude 570 m, 11.ix.2002, swept from tree trunk, H.W. Chen.

Etymology.

A combination of the Latin words " fuscus " (= brown) and " femoralis " (= femora), referring to all femora distally brown in females.

Figures

Figure 6. Head, thorax, and abdomen in dorsal and lateral views. A, B Stegana (Orthostegana) cuodi Peng & Chen sp. nov. (male); C, D S. (O.) cuodi Peng & Chen sp. nov. (female); E, F S. (O.) fuscofemorata Peng & Chen sp. nov. (male); G, H S. (O.) fuscofemorata Peng & Chen sp. nov. (female).

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 15. Stegana (Orthostegana) fuscofemorata 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.