Sciasmomyia leishanensis, Shi, Li, Gaimari, Stephen D. & Yang, Ding, 2013

Shi, Li, Gaimari, Stephen D. & Yang, Ding, 2013, Revision of Sciasmomyia Hendel (Diptera: Lauxaniidae), with eight new species, Zootaxa 3691 (4), pp. 401-435 : 407-411

Sciasmomyia leishanensis sp. nov.

( Figs 12–26 )

Diagnosis. Face with pair of brown Y-shaped lateral stripes. Mesonotum with pair of brown spots anteriorly, two grayish median stripes along inside of dc rows, posterior 1/3 between two dc rows mostly grayish; anepisternum yellow with 2–3 brown spots along upper, anterolateral and ventral margins (in few specimens, anepisternum mostly grayish brown); katepisternum yellow with a brown spot near upper margin, extending downwards to middle area or ventral margin (in few specimens, mostly grayish brown). Wing with crossvein r-m brown, surrounded by hyaline ring. Abdomen yellowish brown, tergites 1–6 each laterally with pale yellowish spots and dark brown pruinose posterior margin. Male with syntergosternite 7+8 forming short and narrow sclerite fused with epandrium; epandrium with small projecting anterior process in lateral view; hypandrial apodeme longer than lateral arms of hypandrium in ventral view; phallus consists of a pair of small acuate subbasal processes, a pair of acuate subapical processes, a V-shaped sclerite and a broad membranous process with small incision and pair of dorsoapical teeth in ventral view. Female with tergite and sternite 8 black; hypogynial valve with semicircular bare area at tip in ventral view.

Description. MALE. Body length 4.5–6.1 mm, wing length 5.5–6.8 mm. FEMALE. Body length 5.3–5.7 mm, wing length 5.6–5.8 mm.

Head ( Fig. 13 ) yellow. Frons with two wide brown stripes extending to vertex; ocellar triangle grayish black; oc strong, as long as anterior or. Face with brown median stripe on upper 2/3 and pair of brown Y-shaped lateral stripes, pair of larger brown spots at ventral corner and wide blackish brown stripe on ventral margin; parafacial yellow except for inner margin black, with elliptical spot at ventral corner. Gena about 1/2 height of eye, with large brown elliptical spot. Antenna yellow, 1st flagellomere 1.4 times longer than high, with longest setulae shorter than 1/3 height of 1st flagellomere. Proboscis yellow except for pale brown apically. Palpus pale brown.

Thorax ( Fig. 14 ) yellow with grayish white pruinosity. Mesonotum with pair of brown spots anteriorly, two grayish median stripes along inside of dc rows, posterior 1/3 between two dc rows mostly grayish; anepisternum yellow with 2–3 brown spots along upper, anterolateral and ventral margins (in few specimens, anepisternum mostly grayish brown); katepisternum yellow with brown spot near upper margin, extending downwards to middle area or ventral margin (in few specimens, mostly grayish brown). Legs yellow, all basitarsi with a basal ring, tarsomere 2 brown at tip and tarsomeres 3–5 pale brown. Fore femur with 4–5 pv and 6 pd, mid femur with 4 weak a and hind femur with 1 weak preapical ad. Wing ( Fig. 15 ) pale brown with hyaline spots, all of which display white on that part of the vein; subcostal cell with brown spot; series of longitudinal spots along costal margin extending through R2+3, along R4+5, and along CuA1, all of which are constricted at middle; crossvein r-m pale brown, surrounded by hyaline ring; hyaline spot in cell r4+5 above dorsal tip of crossvein dm-cu; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 7.4:1.4:1; ultimate and penultimate sections of M 1 in proportion of 1:1.4; ultimate section of CuA1 about 1/7 of penultimate. Halter pale yellow.

Abdomen yellowish brown with grayish pruinosity, tergites 1–6 each laterally with pale yellowish spots and dark brown pruinose posterior margin. Female with eversible vescicle extending out from brown pleural membrane at level between tergites 5 and 6. Male genitalia ( Figs 17–20 , 24–25 ): syntergosternite 7+8 forming short and narrow sclerite fused to epandrium; epandrium blackish brown and slender, rounded apically with a small projecting anterior process in lateral view; surstylus consisting of pair of blackish elliptical sclerites with setulae in ventral view; hypandrial apodeme slender or broad, longer than lateral arms in ventral view; phallus delicate (weakly sclerotized), consisting of pair of small acuate subbasal processes, pair of acuate subapical processes, a Vshaped sclerite and a broad membranous process with a small incision and pair of dorsoapical teeth in ventral view (few specimens with pair of tiny pale brown processes near strong subapical processes); phallapodeme (fused to phallus) short, claviform. Female terminalia ( Figs 21–23 ): tergite and sternite 8 black; epiproct and hypoproct nearly triangular, hypogynial valve with dense setulae except for a bare area at tip in lateral view, and semicircular bare area at tip in ventral view. Egg ( Fig. 26 ) with a web-like chorion between longitudinal ridges.

Type material. Holotype 3 (IZAS, IOZ1218565): CHINA, Guizhou Province: Leishan, Taojiang, 1500 m, 6. VII. 1988, Xiaochun Zhang. Paratypes: CHINA, Hubei Province: West Hupeh Prov., Lichuan District: Leong-Ho- Kow, 4. IX. 1948 (13, 1Ƥ CSCA); Suisapa 1000 m, 26–31. VII. 1948, Gressitt & Djou (23, CASC); Suisapa, 1000 m, 30. VIII. 1948, Gressitt & Djou (13, CASC); Suisapa 1000 m, 17. IX. 1948, Gressitt & Djou (1Ƥ, CASC); Suisapa west ridge, 1200–1500 m, 6. VIII. 1948, Gressitt & Djou (13, CASC); Chi-su-shan 1150–1650 m, 24. IX. 1948, Gressitt & Djou (13, CASC).

Distribution. China (Guizhou, Hubei).

Remarks. The new species is very similar to Sciasmomyia longissima sp. nov., S. meijerei , and S. thaii sp. nov., but can be separated from these species by characteristics of the male and female genitalia.

Etymology. Named for the type locality, Leishan, in Guizhou Province, China.

Figures

FIGURES 12 – 16. Sciasmomyia leishanensis sp. nov. Paratype male. 12. habitus, lateral view; 13. head, anterior view; 14. thorax, dorsal view; 15. wing; 16. abdomen, lateral view.

FIGURES 17 – 23. Sciasmomyia leishanensis sp. nov. Paratype male. 17. syntergosternite 7 + 8 and epandrial complex, lateral view; 18. epandrial complex, posterior view; 19. phallus complex, ventral view; 20. phallus complex, lateral view. Paratype female. 21. abdominal tergites and sternites 5 – 9, lateral view; 22. hypogynial valve, ventral view; 23. spermathecae. Scale 0.1 mm. Abbreviations: e = epandrium; ea = ejaculatory apodeme; ha = hypandrial apodeme; la = lateral arms of hypandrium; p = phallus; ss = surstylus; st = syntergosternite 7 + 8.

FIGURES 24 – 26. Sciasmomyia leishanensis sp. nov. Paratype male. 24. male genitalia complex, lateral view; 25. male genitalia complex, ventral view; 26. egg, lateral view.