Stegana shirozui, Okada, 1971

Chen, Xi-Peng, Gao, Jian-Jun & Chen, Hong-Wei, 2009, The Stegana shirozui species group (Diptera, Drosophilidae) from East Asia, Journal of Natural History 43 (31 - 32), pp. 1909-1927 : 1910-1912

publication ID	https://doi.org/ 10.1080/00222930902996172
persistent identifier	https://treatment.plazi.org/id/03FE700F-FF9E-FFA7-9589-FA5DFC6CFEAD
treatment provided by	Felipe
scientific name	Stegana shirozui
status

Treatment

Stegana shirozui View in CoL species group

Diagnosis

Face black, with two yellow bands on median and lower margin; surstylus with one row of prensisetae submedially and serrated, minute processes ( Figures 9 View Figures 8–14 , 16 View Figures 15–20 , 22 View Figures 21–27 , 29 View Figures 28–33 , 35 View Figures 34–41 , 43 View Figures 42–48 , 50 View Figures 49–55 , 57 View Figures 56–62 , 64 View Figures 63–69 ).

Description (male and female)

Head. Eyes red. Ocellar triangle black, with a pair of small setae above ocellar setae. Postvertical setae slightly behind vertex ridge. Frons and face rectangular in profile. Frons brown, shiny, with a black band, sporadic, minute setulae and slightly tumefy below (above ptilinal fissure). Proclinate orbital setae nearer to ptilinal fissure than to inner vertical setae. Face slightly broadened below; facial carina slight above. Palpus with five to six longer setae distally and several shorter setae basally. Gena broad (ch/o ≥ 0.13), white-yellow. Vibrissa prominent; other orals small. Occiput glossy, yellow, black around occipital foramen.

Thorax. Mesoscutum brown to black, with yellow longitudinal markings laterally ( Nishiharu 1979). Postpronotal lobe with one to two longer and a few small setae. Acrostichal setulae in approximately 10 irregular rows. Prescutellar setae one pair. Mesopleuron with a black longitudinal stripe above (running from propleuron to base of halter). Katepisternum white, unicolorous. Basal scutellar setae divergent; apical scutellars cruciate.

Wing. Dark brown to black anteriorly, slightly pale posteriorly, white-yellow at tip, curved downward on distal part. Basal medial-cubital crossvein present; C 1 setae 2, less differentiated. Costal vein with six to eight minute spinules on ventral surface between R 2+3 and R 4+5. R 2+3 markedly curved to costa at tip; R 4+5 and M 1 convergent distally. Halters white basally, grey-brown distally.

Legs. Almost white-yellow, grey-brown to black on knee joints of fore and hind legs, distal parts of femora and basal part of tibiae of mid leg. Fore femur with one row (four to five) of setae on medial part of posterior surface and one row (three to five) of setae on distal part of ventral surface; mid tibia with four to five strong setae on basal part of dorsal surface. Apical seta present on mid tibia. Preapical dorsal setae present on all tibiae. Mid tibia with four to six strong setae on basal part of dorsal surface. Mid and hind tarsomeres with two and one row(s) of minute cuneiform setulae on ventral surface, respectively; fore and hind first tarsomeres slightly shorter than the rest combined; mid first tarsomere longer than the rest combined. Abdominal sternites broadened, wider than length.

Male terminalia. epandrium pubescent, mostly with dense setae near posterior margin on each body-side, usually protruded ventrally ( Figures 8 View Figures 8–14 , 15 View Figures 15–20 , 21 View Figures 21–27 , 28 View Figures 28–33 , 34 View Figures 34–41 , 42 View Figures 42–48 , 49 View Figures 49–55 , 56 View Figures 56–62 , 63 View Figures 63–69 ). Surstylus separated from epandrium. Tenth sternite (decasternum) connects with surstyli basolaterally ( Figures 1, 6 View Figures 1–7 , 10 View Figures 8–14 , 17 View Figures 15–20 , 23 View Figures 21–27 , 30 View Figures 28–33 , 36 View Figures 34–41 , 44 View Figures 42–48 , 51 View Figures 49–55 , 58 View Figures 56–62 , 65 View Figures 63–69 ). Cercus separated from epandrium, setigerous, but not pubescent ( Figures 8 View Figures 8–14 , 15 View Figures 15–20 , 21 View Figures 21–27 , 28 View Figures 28–33 , 34 View Figures 34–41 , 42 View Figures 42–48 , 49 View Figures 49–55 , 56 View Figures 56–62 , 63 View Figures 63–69 ). Hypandrium mostly elongated anteromedially ( Figures 11, 12 View Figures 8–14 , 24, 25 View Figures 21–27 , 31, 32 View Figures 28–33 , 37, 38 View Figures 34–41 , 45, 46 View Figures 42–48 , 59, 60 View Figures 56–62 , 66, 67 View Figures 63–69 ). Parameres (paraphysis) mostly fused with hypandrium, with a few setulae ( Figures 11, 12 View Figures 8–14 , 24, 25 View Figures 21–27 , 31, 32 View Figures 28–33 , 37, 38 View Figures 34–41 , 45, 46 View Figures 42–48 , 52, 53 View Figures 49–55 , 59, 60 View Figures 56–62 , 66, 67 View Figures 63–69 ). Gonopods forming posteromedian lobe, strongly sclerotized, posterolaterally contiguous to posterior ends of hypandrium, sometimes dorsodistally with 1 projection bearing serrated, minute processes ( Figures 2, 7 View Figures 1–7 , 13, 14 View Figures 8–14 , 20 View Figures 15–20 , 26, 27 View Figures 21–27 , 33 View Figures 28–33 , 40, 41 View Figures 34–41 , 47, 48 View Figures 42–48 , 54, 55 View Figures 49–55 , 61, 62 View Figures 56–62 , 68, 69 View Figures 63–69 ). Aedeagus expanded distally, with tentacle-like setae (marginal fringe in Bächli et al. [2004]) and serrated, minute processes, basally fused with aedeagal apodeme ( Figures 11, 12 View Figures 8–14 , 18, 19 View Figures 15–20 , 24, 25 View Figures 21–27 , 31, 32 View Figures 28–33 , 38, 39 View Figures 34–41 , 45, 46 View Figures 42–48 , 52, 53 View Figures 49–55 , 59, 60 View Figures 56–62 , 66, 67 View Figures 63–69 ). Aedeagal apodeme mostly slender ( Figures 11, 12 View Figures 8–14 , 18, 19 View Figures 15–20 , 24, 25 View Figures 21–27 , 31, 32 View Figures 28–33 , 38, 39 View Figures 34–41 , 45, 46 View Figures 42–48 , 59, 60 View Figures 56–62 , 66, 67 View Figures 63–69 ).

Female terminalia ( Figures 3–5 View Figures 1–7 ). Same characters present in all known species of this group. Epiproct not pubescent; cercus not pubescent; oviscapt (eighth sternite) with one row of small setae; hypoproct with numerous setae and pubescence.