Stegana (Steganina) monodonata, Chen, Xi-Peng & Chen, Hong-Wei, 2008

Chen, Xi-Peng & Chen, Hong-Wei, 2008, The Stegana coleoptrata species group (Diptera: Drosophilidae) from mainland China, Zootaxa 1891, pp. 55-65 : 58-60

Stegana (Steganina) monodonata sp. nov.

( Figs 7–12 )

Specimens examined. Holotype ɗ (SCAU, No. 120296): CHINA – labeled “Mt. Ailao, Jingdong, Simao, Yunnan, 24°32 N, 101°01' E, 2450 m a.s.l., 27.vii.2006, on tree trunk, T. Li”.

Etymology. A combination of the Greek words “monos + odontos”, referring to the surstylus with 1 small prensiseta apically.

Diagnosis. Gonopods nearly quadrate and flat at dorsal margin, with 1 small projection on posterior surface ( Fig. 12 ); 10th sternite broadly bilobed ( Fig. 9 ).

Description. Some characters commonly seen in S. melanostoma sp. nov. are not referred to in the following description. Male: Clypeus black medially, yellow laterally. Palpus entirely yellow. Legs white to yellowish, dark brown at fore knees, distal half of mid femur and basal half of mid tibia, distal 1/3 of hind femur and basal 1/3 of hind tibia. Male terminalia: Epandrium with ca. 21 setae on dorsal to posterolateral portion per side ( Fig. 7 ). Paramere with ca. 3 setulae ( Figs. 10, 11 ). Aedeagus subbasally expanded in ventral view and with several serration processes, with dense, thin tentacle-like setae along apical margin ( Figs. 10, 11 ).

Measurements. BL = 2.87 mm; ThL = 1.32 mm; WL = 2.84 mm; WW = 1.13 mm. Indices: arb = 5/4, avd = 0.60, adf = 1.25, flw = 1.91, FW/HW = 0.47, ch/o = 0.15, prorb = 1.14, rcorb = 0.82, vb = 0.43, dcl = 0.44, presctl = 0.47, sctl = damaged, sterno = 0.80, orbito = 1.83, dcp = 0.23, sctlp = 1.53, C = 1.89, 4c = 0.91, 4v = 1.40, 5x = 1.37, ac = 10.33, M = 0.42, C3F = 0.66.

Distribution. China (Yunnan).

Stegana (Steganina) pililobosa sp. nov. ( Figs 13–18 )

Specimens examined. Holotype ɗ (SCAU, No. 120294): CHINA – labeled “Shennongjia, Hubei, 1700 m a.s.l, 1.viii.2005, on tree trunk, H.W. Chen”. Paratype: 1ɗ, same data as holotype (SCAU, No. 120295).

Etymology. A combination of the Greek words “pilos + lobos”, referring to the medial flaps of hypandrium with pubescence.

Diagnosis. Tentn sternite and medial flaps of hypandrium ( Hu & Toda 1994; fused gonopods in Bächli et al. 2004) pubescent ( Figs. 15, 16 ); aedeagus not expanded medially in ventral view ( Fig. 16 ).

Description. Some characters commonly seen in S. melanostoma sp. nov. are not referred to in the following description. Male: Clypeus almost yellow, darkened medially. Palpus entirely yellow. Legs white to yellowish, dark brown at fore knees, distal half of mid femur and basal half of mid tibia, distal 1/3 of hind femur and basal 1/3 of hind tibia. Abdominal tergites black. Male terminalia: Epandrium with ca. 34 setae on dorsal to posterolateral portion per side ( Fig. 13 ). Surstylus distally with numerous setae on outer and inner surfaces ( Fig. 14 ). Tenth sternite strongly sclerotized, roundly protruded dorsally ( Fig. 15 ). Gonopods vaulted, with 1 small medial projection on posterior surface ( Fig. 18 ). Aedeagus with orderly tentacle-like setae along apical margin ( Figs. 16, 17 ).

Measurements. BL = 2.48 mm (1ɗ paratype 2.53 mm); ThL = 1.66 (1.52 mm); WL = 3.06 (2.53 mm); WW = 1.28 (1.03 mm). Indices: arb = 8/5 (8/5), avd = 0.69 (0.67), adf = 1.33 (1.25), flw = 1.91 (1.83), FW/ HW = 0.52 (0.49), ch/o = 0.21 (0.18), prorb = damaged (1.25), rcorb = damaged (0.75), vb = 0.50 (0.48), dcl = 0.63 (0.55), presctl = 0.83 (0.68), sctl = 1.50 (1.42), sterno = damaged, orbito = 1.55 (2.00), dcp = 0.26 (0.24), sctlp = 1.82 (1.79), C = 1.88 (1.82), 4c = 1.20 (1.10), 4v = 1.85 (1.77), 5x = 1.25 (1.09), ac = 12.00 (11.33), M = 0.50 (0.39), C3F = 0.76 (0.69).

Distribution. China (Hubei).

Figures

FIGURES 7 – 12. Stegana (Steganina) monodonata sp. nov., male genitalia: 7. epandrium, surstylus and cercus; 8. surstylus; 9. 10 th sternite; 10. hypandrium, paramere, aedeagus and aedeagal apodeme; 11, ditto; 12, gonopods (For orientation, abbreviations and scale lines see Figs. 1 – 6).

FIGURES 13 – 18. Stegana (Steganina) pililobosa sp. nov., male genitalia: 13. epandrium, surstylus and cercus; 14. surstylus; 15. 10 th sternite; 16. hypandrium, paramere, aedeagus and aedeagal apodeme; 17. ditto; 18. gonopods (For orientation, abbreviations and scale lines see Figs. 1 – 6).