Leucophenga argentata

Huang, Jia & Chen, Hongwei, 2016, The genus Leucophenga (Diptera, Drosophilidae), part VI: the argentata species group from the East Asia, with morphological and molecular evidence, Zootaxa 4161 (2), pp. 207-227 : 212-213

Leucophenga argentata species group

Leucophenga argentata species group: Bächli, 1971: 106.

Diagnosis. Ocellar setae mostly extremely minute in male ( Fig. 6 A), but normal in female; postocellar setae extremely minute ( Fig. 6 A); Orb3 (proclinate orbital setae) and Orb2 (anterior reclinate orbital setae) very close together ( Fig. 6 A); wing hyaline, lacking any pattern on membrane, brown on R1 medially ( Fig. 2 ); halter mostly yellowish, with a black patch at knob ( Figs. 3 , 4 ); aedeagus slender, laterally with thin process(es) (tp in Figs. 6 E, 8D, 9D, 11D) and/or acute process(es) (ap in Figs. 7–11 D).

Description. Male and female: Eyes red to brownish red. Ocellar triangle brownish to brown. Frons narrow, nearly parallel, slightly silvery pollinose, with a few minute setulae medially. All orbital setae large; Orb3 and Orb2 separated by distance less than 1/5 of that between Orb2 and Orb1 (posterior reclinate) ( Fig. 6 A); Orb2 placed afore Orb 3 in some specimens. Arista plumose. Face usually yellowish in male, yellow to brownish in female; facial carina absent. Palpus usually brownish yellow to brownish, slightly more enlarged distally in female than in male. Vibrissa prominent; subvibrissal setae small. Gena and postgena narrow. Mesonotum usually yellowish in male, yellow to brownish in female. Postpronotal lobe usually yellowish to yellow, with 1–3 long seta(e) and a few of shorter setae. Acrostichal setulae in ca. 6–10 irregular rows. Prescutellar setae large. Pleura lacking any stripe above. Katepisternum yellow to yellowish, with two long and some small setae. Meron yellowish to yellow. Scutellum usually yellowish to yellow at tip. Subscutellum swollen. Basal medial-cubital crossvein absent. Costal vein between R2+3 and R4+5 distally with ca. 4–8 peg-like spinules on ventral surface; R2+3 slightly curved; R4+5 and M1 nearly parallel distally. Legs yellowish, except for the brown on knees of mid and hindlegs. Thorax entirely with dense silvery pollinosity. Abdominal tergites usually yellowish in male, yellow in female, with dense silvery pollinosity mainly before 4th tergite, and with dark color patches obviously variable between male and female ( Fig. 5 ). Male terminalia: Epandrium desclerotized, pubescent, usually with several setae around ventral corner to posterior margin and undeveloped apodeme along anterior margin. Surstylus usually broad and flat, nearly entirely pubescent, with several setae on outer and inner surfaces. Cercus separated from epandrium, pubescent and setigerous. Hypandrium (gonopod in Bächli et al. 2004) anteriorly fused to aedeagal apodeme, laterally broadened, lacking any seta. Gonopods (dorsal arch in Bächli et al. 2004) fused with each other, forming slightly triangular plate, anteroventrally with curved, median rod. Paramere (outer paraphysis in Bächli et al. 2004) contiguous to arm of aedeagal apodeme basally, glabrous, usually with a few sensilla distally. Aedeagal basal bridges (inner paraphysis in Bächli et al. 2004) contiguous to median rod of gonopods, bifurcated basomedially.

In the following descriptions of individual species, only characters showing interspecific variability are described for brevity.

Figures

FIGURE 2. Wing of male: A. Leucophenga argentata; B. L. bicuspidata sp. nov.; C. L. fuscivena sp. nov.; D. L. longipenis sp. nov.; E. L. quadricuspidata sp. nov.; F. L. tricuspidata sp. nov. Scale bars = 1 mm.

FIGURE 3. Dorsal and lateral view of thorax: A, B. Leucophenga argentata in male; C, D. L. argentata in female; E, F. L. bicuspidata sp. nov. in male; G, H. L. bicuspidata sp. nov. in female; I, J. L. fuscivena sp. nov. in male.

FIGURE 4. Dorsal and lateral view of thorax: A, B. Leucophenga fuscivena sp. nov. in female; C, D. L. longipenis sp. nov. in male; E, F. L. longipenis sp. nov. in female; G, H. L. quadricuspidata sp. nov. in male; I, J. L. tricuspidata sp. nov. in male.

FIGURE 5. Abdominal tergites patterns: A – D. Leucophenga argentata; E, F. L. bicuspidata sp. nov.; G – I. L. fuscivena sp. nov.; J – L. L. longipenis sp. nov.; M. L. quadricuspidata sp. nov.; N. L. tricuspidata sp. nov.; O. Color legend.

FIGURE 6. Leucophenga argentata de Meijere, 1914, male head and terminalia in lateral view. A. Head, proclinate orbital setae (Orb 3), anterior reclinate orbital setae (Orb 2), posterior reclinate (Orb 1), ocellar setae (oc s) and postocellar setae (poc s); B. Epandrium (epand), surstylus (sur) and cercus (cerc); C. Hypandrium (hypd), paramere (pm), gonopods (gon) and aedeagus (aed); D. Paramere; E. Aedeagus and thin process (tp). Scale bars = 0.1 mm.

FIGURE 7. Leucophenga bicuspidata sp. nov., male terminalia in lateral view. A. Epandrium, surstylus and cercus; B. Hypandrium, paramere, gonopods and aedeagus; C. Paramere; D. Aedeagus and acute processes (ap). Scale bars = 0.1 mm.

FIGURE 8. Leucophenga fuscivena sp. nov., male terminalia in lateral view. A. Epandrium, surstylus and cercus; B. Hypandrium, paramere, gonopods and aedeagus; C. Paramere; D. Aedeagus, thin process (tp) and acute process (ap). Scale bars = 0.1 mm.

FIGURE 9. Leucophenga longipenis sp. nov., male terminalia in lateral view. A. Epandrium, surstylus and cercus; B. Hypandrium, paramere, gonopods and aedeagus; C. Paramere; D. Aedeagus, acute process (ap) and thin process (tp). Scale bars = 0.1 mm.

FIGURE 10. Leucophenga quadricuspidata sp. nov., male terminalia in lateral view. A. Epandrium, surstylus and cercus; B. Hypandrium, paramere, gonopods and aedeagus; C. Paramere; D. Aedeagus and acute processes (ap). Scale bars = 0.1 mm.

FIGURE 11. Leucophenga tricuspidata sp. nov., male terminalia in lateral view. A. Epandrium, surstylus and cercus; B. Hypandrium, paramere, gonopods and aedeagus; C. Paramere; D. Aedeagus, acute processes (ap) and thin process (tp). Scale bars = 0.1 mm.