Stegana (Orthostegana) macrostephana 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/A88359E6-0151-4DD6-976C-8B008DB7A153
taxon LSID	lsid:zoobank.org:act:A88359E6-0151-4DD6-976C-8B008DB7A153
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Stegana (Orthostegana) macrostephana Peng & Chen
status	sp. nov.

Treatment

3.2.1.6. Stegana (Orthostegana) macrostephana Peng & Chen sp. nov.

Figs 7C-F View Figure 7 , 10B View Figure 10 , 17 View Figure 17

Diagnosis.

This species closely resembles S. (O.) pinguitia sp. nov. in the aedeagus medioventrally and distally with dense long hairs (Figs 17C View Figure 17 , 17D View Figure 17 , 20C View Figure 20 , 20D View Figure 20 ), but can be distinguished from the latter by having the mesotarsus ventrally with 2 rows of black, apically blunt, stout spines; metatarsus with 15/3+1 spines; 2nd to 4th segments with 6/1, 4/1, and 3/1 spines, respectively (Fig. 10B View Figure 10 ); pregonites slender, with ca. 2 or 3 sensilla medioventrally and some setae distally per side (Fig. 17C, D View Figure 17 ).

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 yellow and first flagellomere brownish yellow to brown, with black pubescence. Face and gena brown. Clypeus dark brown medially and yellow laterally. Palpus brownish basally and dark brown distally. Thorax: Mesonotum yellow to brownish yellow (Fig. 7C, E View Figure 7 ). Pleura with a distinct brownish to brown longitudinal stripe above (Fig. 7D, F View Figure 7 ). Scutellum mostly yellow to brownish yellow (Fig. 7C, E View Figure 7 ). Halter mostly brownish, with a yellow patch at knob (Fig. 7C-F View Figure 7 ). Legs yellowish (Fig. 10B View Figure 10 ). Abdominal tergites: brownish yellow to brownish. Male terminalia: Epandrium mostly pubescent except for anterior margin, with ca. 28 setae on dorsal to posterior portions per side (Fig. 17A View Figure 17 ). Surstylus separated from epandrium, with ca. 22 long and 15 short peg-shaped prensisetae near anterior margin on inner surface (Fig. 17B View Figure 17 ). Pregonites fused basally (Fig. 17C, D View Figure 17 ). Aedeagus pubescent distally (Fig. 17C, D View Figure 17 ). Aedeagal sheath expanded and lobe-shaped distally (Fig. 17D View Figure 17 ). Female terminalia: Eighth sternite with 3 rows of orderly and nearly symmetrical peg-shaped prensisetae subposteromedially and posterolaterally, and with 3 sensilla distally per side (Fig. 17E View Figure 17 ).

Measurements and indices.

BL = 3.50 mm in holotype (range in 5♂ and 5♀ paratypes: 3.30-3.50 in ♂, 2.67-3.33 in ♀), ThL = 1.50 mm (1.40-1.50 in ♂, 1.00-1.53 in ♀), WL = 3.00 mm (2.77-2.95 in ♂, 2.27-3.23 in ♀), WW = 1.25 mm (1.20-1.30 in ♂, 1.16-1.50 in ♀), arb = 8/4 (5-9/4-5), avd = 0.63 (0.64-0.93), adf = 1.60 (1.20-2.50), flw = 1.70 (1.63-2.00), FW/HW = 0.41 (0.35-0.41), ch/o = 0.12 (0.08-0.14), prorb = 1.08 (0.90-1.39), rcorb = 0.80 (0.53-0.83), vb = 0.50 (0.24-0.56), dcl = 0.50 (0.33-0.67), presctl = 0.40 (0.33-0.57), sctl = 1.12 (1.06-1.29), sterno = 0.77 (0.68-0.97), orbito = 1.67 (1.60-2.20), dcp = 0.28 (0.23-0.41), sctlp = 1.00 (0.91-1.33), C = 2.33 (2.00-2.67), 4c = 0.91 (0.85-1.00), 4v = 1.70 (1.56-0.95), 5x = 1.15 (1.20-2.11), ac = 10.00 (9.00-13.33), M = 0.45 (0.38-0.48), C3F = 0.74 (0.65-0.81).

Distribution.

China (Yunnan).

Type material examined.

Holotype: ♂ (SCAU, No. 112090), China: Mengdong, Cangyun, Yunnan, 23°10′08″N, 99°13′52″ E, altitude 1323 m, 6.v.2016, swept from tussock, Y.Q. Liu. Paratypes: 10♂, 5♀ (SCAU, Nos. 112091-98, 112110-16), altitudes 1300-1320 m, J. Huang, Y.Q. Liu, Y.L. Wang, L. Zhu, other data same as the holotype; 1♂, 9♀ (SCAU, Nos. 112099-108), Muyiji Park, Ximeng, Yunnan, 22°37′15″N, 99°35′42″E, altitude 1203 m, 29.iv.2016, swept from tussocks, J. Huang, Y.Q. Liu, Y.L. Wang, L. Zhu; 1♂ (SCAU, No. 112109), Botanic Garden, Ruili, Yunnan, 24°01′12″N, 97°51′33″E, altitude 1174 m, 22.v.2016, swept from tussock, J. Huang.

Etymology.

A combination of the Greek words " macr -" (= large) and " stephan -" (= crown), referring to the apically floriform aedeagus.