Stegana (Oxyphortica) convergens

Stegana (Oxyphortica) convergens species group

Diagnosis

Surstylus dorsally to submedially with 1 or 2 sclerotised, pointed prensiseta(e) (Figures 5 – 8 (b)); parameres small, fused with each other basally (Figures 5 – 8 (c,d)); aedeagus with tentacle-like processes apically (Figures 5 – 8 (c,d)); gonopods basally fused with each other, distally separated into 2 lobe-like processes: ventral process bearing dense hairs along margins; dorsal process curved dorsad, more or less pointed apically (Figures 5 – 8 (c,d)) (Cheng et al. 2010).

Description

Male and female: Eyes brownish red. Ocellar triangle dark brown to black, without small seta above. Postocellar setae small. Frons and fronto-orbital plate brown to dark brown, with minute interfrontal setulae. Pedicel brown, with 2 long setae and several minute setulae; first flagellomere mostly greyish brown. Carina slightly prominent in upper part. Gena narrow, linear. Palpus yellow, with 3 or 4 long setae and several minute setulae. Mesoscutum mostly yellow, with ca. 10 irregular rows of acrostichal setulae. Postpronotal lobe greyish yellow, with 1 long seta. Basal scutellar setae divergent; apical scutellar setae crossed. Pleura with broad, longitudinal, brown stripe above (running from propleuron to base of halter). Katepisternum mostly yellow, with 3 setae, among which medial one shortest. Basisternum black on anterior corners. Wing greyish brown, dark brown on distal part of anterior margin. Veins dark brown. Costal vein between R 2+3 and R 4+5 with 4 – 6 peg-like spinules on ventral surface. Veins R 2+3 and R 4+5 nearly straight. Vein M 1 distally weakly convergent to vein R 4+5. Basal medial-cubital crossvein present. Halter greyish yellow, basally slightly brownish. Legs yellowish to yellow. Femur of fore leg with 2 or 3 setae posteroventrally, which are longer than width of femur. Midleg tibia basodorsally with 2 long setae. Preapical dorsal setae on all tibiae; apical setae only on fore and mid tibiae. Midleg tarsi ventrally with 2 rows and hind leg tarsi ventrally with 1 row of minute cuneiform bristles. Fore and mid leg basitarsi as long as the 3 succeeding tarsal segments together; hind leg basitarsus slightly shorter than the 3 succeeding segments together. Abdominal tergites usually yellow medially, brown to black laterally, sometimes variable between young and old adults, or among localities (Figures 3 and 4). Male terminalia: epandrium broad, lacking developed apodeme on anterior margin, with pubescence posterodorsally and dense setae on posterior margin (Figures 5 – 8 (a)). Cercus separate from epandrium, narrow, setigerous, but lacking pubescence (Figures 5 – 8 (a)). Hypandrium semicircularly expanded anteromedially (Figures 5 – 8 (c,d)). Aedeagus slender, fused with aedeagal apodeme, mostly concealed within gonopods (Figures 5 – 8 (c,d)).

For the species described below, only the characters that depart from the abovementioned generic description are provided for brevity.

Included species

Stegana (O.) apicopubescens Cheng, Xu and Chen 2010 (China: Guangdong, Guangxi); S. (O.) apicosetosa Cheng, Xu and Chen 2010 (China: Hunan, Guangdong, Guangxi, Guizhou); S. (O.) convergens (de Meijere, 1911) (China: Taiwan; Vietnam: Ha Son Binh; Malaysia: Sabah, Sarawak; Indonesia: Java; New Guinea); S. (O.) mediospinosa Cheng, Xu and Chen 2010 (China: Yunnan; Laos: Khammouane); S. (O.) setifrons Sidorenko, 1997 (China: Zhejiang, Fujian, Jiangxi, Hubei, Shaanxi); S. (O.) gonglui sp. nov. (China: Yunnan); S. (O.) xiaoyangae sp. nov. (China: Hubei); S. (O.) zhulinae sp. nov. (China: Yunnan).