Stegana (Oxyphortica) convergens (de Meijere, 1911)

Huang, Jia, Wang, Nan-Nan, Zhang, Yuan & Chen, Hong-Wei, 2018, Stegana (Oxyphortica) convergens species group (Diptera: Drosophilidae) from the Oriental region, with morphological and molecular evidence, Journal of Natural History 52 (21 - 24), pp. 1473-1492 : 1481-1482

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) .

Figures

Figure 3. Colour patterns of abdominal tergites: (a,b) Stegana (Oxyphortica) apicopubescens; (c,d) S. (O.) apicosetosa; (e) S. (O.) convergens; (f–i) S. (O.) mediospinosa.

Figure 4. Colour patterns of abdominal tergites: (a–c) Stegana (Oxyphortica) setifrons; (d) S. (O.) gonglui sp. nov.; (e) S. (O.) xiaoyangae sp. nov.; (f–h) S. (O.) zhulinae sp. nov.; (i) colour legend for Figures 3 and 4.

Figure 5. Stegana (Oxyphortica) setifrons Sidorenko, male terminalia: (a) epandrium (epand), cercus (cerc) and surstylus (sur) (lateral view); (b) surstylus (ventral view); (c, d) hypandrium (hypd), parameres (pm), gonopods (gon), aedeagus (aed) and aedeagal apodeme (aed a) (ventral and lateral views). Scale bars: 0.1 mm.

Figure 6. Stegana (Oxyphortica) gonglui Wang and Chen,sp.nov., male terminalia: (a) epandrium,cercus and surstylus; (b) surstylus with two projections (prs) posteroventrally; (c, d) hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral views). Scale bars: 0.1 mm.

Figure 7. Stegana (Oxyphortica) xiaoyangae Zhang and Chen, sp. nov., male terminalia: (a) epandrium, cercus and surstylus; (b) surstylus; (c, d) hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral views). Scale bars: 0.1 mm.

Figure 8. Stegana (Oxyphortica) zhulinae Wang and Chen, sp. nov., male terminalia: (a) epandrium, cercus and surstylus; (b) surstylus; (c, d) hypandrium, parameres, gonopods, aedeagus and aedeagal apodeme (ventral and lateral views). Scale bars: 0.1 mm.