Stegana, Meigen, 1830

Li, Tong, Cao, Huazhi, Gao, Jianjun & Chen, Hongwei, 2010, A revision of the subgenus Stegana (s. s.) (Diptera, Drosophilidae) from mainland China, Zoological Journal of the Linnean Society 158 (4), pp. 726-739 : 736

KEY TO SPECIES OF STEGANA (S.S.) FROM MAINLAND CHINA – MALES

1. Parameres fused with each other ......................................................................................................... 2

– Parameres separated from each other ................................................................................................... 5

2. Surstylus with two prensisetae; paramere very small, lacking sensilla or setae; aedeagus apically with dense long pubescence....................................................................................................... Stegana sinica Sidorenko

– Surstylus with one prensiseta at most; paramere developed, with sensilla or setae; aedeagus apically with rod-like processes or tentacle-like setae ............................................................................................................ 3

3. Parameres strongly sclerotized, nearly black, fused to each other from basal third, with a few sensilla on basal third; aedeagus with c. 16 pairs of short rod-like processes apically............................................................. ......................................................................................... Stegana polyrhopalia Cao & Chen sp. nov.

– Small part of parameres black, entirely fused each other, with long setae; aedeagus with tentacle-like setae............................................................................................................................................................4

4. Aedeagus almost sclerotized dorsally, apically with three small processes on each side; gonopods with three subequal processes medially and submedially; paramere with two to three long setae and several small sensilla .......................................................................................................... Stegana zhangi Sidorenko

– Aedeagus sclerotized laterally, apically without sclerotized processes per side; gonopods with one larger and two smaller processes medially and submedially; paramere with 15–17 strong setae, lacking small sensilla.............. ................................................................................................ Stegana rotunda Cao & Chen sp. nov.

5. Paramere entirely pubescent, lacking setae; aedeagus apically protruded on posteromedian surface .................. .......................................................................................... Stegana apiciprocera Cao & Chen sp. nov.

– Paramere with long setae, lacking pubescence; aedeagus apically round or flattened on posteromedian surface.........................................................................................................................................................6

6. Aedeagus strongly sclerotized on distal third, narrowly membranous along margin, with one strongly sclerotized medial ridge on basal two-thirds, lacking spine-like processes.................................... Stegana cheni Sidorenko

– Aedeagus sclerotized laterally, with numerous spine-like processes.............................................................7

7. Mesonotum dark brown to black medially, brown laterally, with five yellow stripes medially to sublaterally; aedeagal peristome broadened, as long as one third of length in ventral view ............................................... ......................................................................................... Stegana multispinata Cao & Chen sp. nov.

– Mesonotum yellow, with four black stripes submedially and laterally, submedial pair divergent on posterior third; aedeagal peristome narrow, emarginate in ventral view.................... Stegana quadrata Cao & Chen sp. nov.