Stegana (Steganina) oligochaeta, Chen, Xi-Peng & Chen, Hong-Wei, 2012

Chen, Xi-Peng & Chen, Hong-Wei, 2012, Ten new species of the Stegana (Steganina) shirozui species group (Diptera, Drosophilidae) from China, Zootaxa 3333, pp. 24-37 : 29-30

Stegana (Steganina) oligochaeta sp. nov.

( Figs 28–34 )

Diagnosis. This species is related to S. protuberans sp. nov., but clearly distinguishable from the latter by the epandrium and aedeagus (in S. protuberans : epandrium not broadened on posterior margins, approximately twice as high as wide; aedeagus lacking sclerotized, round, minute processes basoventrally).

Description. Male terminalia: Epandrium broadened on posterior margins, approximately 3/5 as high as wide, protruded ventrally ( Fig. 28 ). Cercus with sporadic pubescence ( Fig. 28 ). Surstylus with 8 prensisetae submedially ( Fig. 29 ). Tenth sternite sclerotized and deeply separated basally, protruded apically ( Fig. 30 ). Paramere with ca. 2 sensilla ( Figs 31, 32 ). Aedeagus with scalelike, minute processes dorsally and several sclerotized, round, minute processes basoventrally, slightly semilunar on opening in ventral view ( Figs 31, 32 ). Dorsomedial projection of gonopods with serrated, minute processes distally ( Fig. 34 ).

Measurements. BL = 2.78 mm in holotype (13 paratype 2.89 mm), ThL = 1.40 mm (1.36 mm), WL = 2.94 mm (3.09 mm), WW = 1.26 mm (1.38 mm), arb = 9/6 (9/5), avd = 0.80 (0.91), adf = 1.43 (1.38), flw = 1.86 (1.63), FW/HW = 0.48 (0.49), ch/o = 0.21 (0.24), prorb = damaged (damaged), rcorb = 0.85 (damaged), vb = 0.33 (0.40), dcl = 0.48 (0.48), presctl = 0.44 (0.45), sctl = damaged (damaged), sterno = 0.88 (0.86), orbito = 2.00 (2.25), dcp = 0.19 (0.17), sctlp = 1.78 (1.90), C = 1.97 (2.00), 4c = 1.17 (1.06), 4v = 1.90 (1.76), 5x = 1.45 (1.33), ac = 11.67 (12.00), M = 0.53 (0.47), C3F = 0.68 (0.66).

Type material. Holotype 3 ( SCAU, No. 120768), CHINA: Mt. Jizu, Binchuan, Yunnan, 1900 m, 23.vii.2006, HL Cao. Paratype: CHINA: 13 ( SCAU, No. 120769), Mt. Wuliang, Nanjian, Yunnan, 25.vii.2006, HL Cao. Distribution. China (Yunnan).

Etymology. A combination of the Greek words: oligos (= few) and chaite (= bristle, seta), referring to the cercus with sporadic pubescence.

Figures

FIGURES 28 – 34. Stegana (Steganina) oligochaeta sp. nov., male terminalia: 28. Epandrium, cercus and surstylus; 29. surstylus; 30. 10 th sternite; 31, 32. hypandrium, aedeagus and aedeagal apodeme; 33, 34. gonopods. Scale bars: 0.1 mm.