Pygophora immaculipennis Frey

Yoshizawa, Satoshi, Tachi, Takuji, Praxaysonbath, Bounthob & Suzuki, Dai, 2015, A new species of the genus Pygophora Schiner from Laos (Diptera: Muscidae), Zootaxa 3920 (4), pp. 586-592 : 587-589

Pygophora immaculipennis Frey

( Figs. 1, 3 , 5–9 , 15–16 )

Pygophora immaculipennis Frey, 1917: 15 . Lectotype male (UZMH, not examined), by designation of Crosskey (1962: 434). Type locality: Anuradhapura, Sri Lanka.

Diagnosis. First flagellomere and all femora entirely yellow in both sexes; fore tibia with 2 distinctive anterodorsal setae near middle; mid femur with 2 preapical posterior setae; mid tibia with 1 anterodorsal seta; male terminalia with anteroventral portion of surstylus pointy in lateral view ( Fig. 5 ).

Redescription. Male. Head ( Fig. 1 ). Fronto-orbital plate, face and parafacial yellowish white; gena and occiput gray; frontal vitta cream yellow to orange; antenna with scape, pedicel, first flagellomere, first and second aristomeres cream yellow; third aristomere brown; palpus and labellum whitish yellow; prementum dark or reddish brown. Two frontal setae; 2 reclinate orbital setae; first flagellomere 2.8–3.0 times as long as pedicel; third aristomere plumose only on basal half.

Thorax. Dorsum and pleura black in ground color with gray pruinosity; anterior and posterior spiracles yellow.

Wing. Hyaline.

Legs. Fore coxa, trochanters, femora, tibiae, tarsi and pulvilli brownish yellow; mid and hind coxae gray in basal part, brownish yellow apically. Fore tibia with 2 distinctive anterodorsal and 1 posterior setae; mid femur with 2 preapical posterior setae; mid tibia with 1 anterodorsal seta on apical third and 2 posterodorsal setae; hind tibia with 2 anterodorsal, 1 anteroventral, 2 posterodorsal and 1 posteroventral setae.

Abdomen ( Figs. 3 , 7 , 15 ). Whitish yellow in ground color with gray pruinosity on tergites 4–5; tergites 4–5 with 3–5 blackish brown spots. Syntergite 1+2 and tergites 3–5 with several pairs of lateral discal setae; tergites 3–5 with 4–6 marginal setae; tergite 5 with a dorsal keel; sternite 5 slender and bilobed posteriorly, with membranous area in middle and some short setae on posterior 2/ 5 in ventral view.

Male terminalia ( Figs. 5–6, 8 ). Epandrium semicircular with many setae in dorsal view; surstylus fused with epandrium at base, in lateral view broad with some short setae on apical half and anteroventral portion pointy, and in dorsal view slender with many inner setae on apical 3/5; cerci in dorsal view concave in middle, with some setae and fused with epandrium at base; bacilliform sclerite in lateral view approximately 3/4 as long as cerci and slightly projecting dorsally near middle; hypandrial arms fused and strongly broad; pregonite small and rounded apically; postgonite curved dorsally on basal 2/5, apex hooked and curved ventrally; phallus with distiphallus broad and orbicular bearing large membranous areas in lateral and dorso-apical parts.

Female ( Fig. 16 ). Differing from male as follows: abdominal tergite 3 with gray pruinosity entirely and 3–5 blackish brown spots; tergite 4 gray; tergite 5 with 2–4 blackish brown spots; first flagellomere 2.1–2.3 times as long as pedicel; hind tibia without posteroventral seta. Female terminalia ( Fig. 9 ). Tergite 6 and sternites 7–8 strongly reduced; sternite 6 broad; hemitergite 7 small and bare; hemitergite 8 narrow with some fine setulae on posterior margin.

Body length. 4.6–6.2 mm (males and females, n= 42).

Material examined. LAOS, 4 males, 10 females, Mekong river, Vientiane city [N 17°57’46” / E 102°35’13”], 23–24. VIII. 2013; 2 females, Pakthoay [N 18°27’06” / E 103°24’52”], 29. VIII. 2013. JAPAN, 1 female, Henaji, Motobu town, Kunigami-gun, Okinawa pref. [N 26°39’20” / E 127°53’39”], 24. VI. 2013; 2 males, 4 females, Kayo, Nago city, Okinawa pref. [N 26°33’10” / E 128°06’26”], 22–23, 27. VI. 2013; 1 male, 5 females, Genka, Nago city, Okinawa pref. [N 26°37’45” / E 128°03’41”], 26. VI. 2013; 10 females, Shiramizu, Ishigaki-jima Is., Okinawa pref. [N 24°25’19” / E 124°09’50”], 22–23, 30. V. 2012; 2 males, Ōtomi, Iriomote-jima Is., Okinawa pref. [N 24°17’37” / E 123°52’58”], 25. V. 2012; 1 female, Urauchi, Iriomote-jima Is., Okinawa pref. [N 24°24’10” / E 123°46’42”], 27. V. 2012.

Distribution. China, India, Japan (Ryukyus), Laos, Myanmar, Pakistan, Sri Lanka and Taiwan.

Bionomics. This species was collected in a grassland and rice paddy field.

Remarks. This species resembles Pygophora confusa Stein and P. torrida (Wiedemann) , but is distinguished from them by having a slender hind tibia in the male, and entirely yellow first flagellomere and femora in the female. This is the first record of P. immaculipennis from Laos.

Figures

FIGURES 1 – 4. Male head and abdomen in lateral view. 1. Male head of Pygophora immaculipennis Frey. 2. Male head of P. laoensis sp. nov. 3. Male abdomen of P. immaculipennis Frey (setae omitted). 4. Male abdomen of P. laoensis sp. nov. (setae omitted). (Scale bars = 0.2 mm). (Abbreviations: comp eye: compound eye; dk: dorsal keel; ped: pedicel; syn 1 + 2: syntergite 1 + 2; T 3: tergite 3; T 4: tergite 4; T 5: tergite 5; thr ari: third aristomere).

FIGURES 5 – 9. Male sternite 5, male and female terminalia of Pygophora immaculipennis Frey: 5. Epandrium, surstylus and cerci in lateral view. 6. Same in dorsal view (setae omitted on the left side). 7. Male sternite 5 in ventral view (setae omitted on the left side). 8. Hypandrium, pregonite, postgonite and phallus in lateral view. 9. Female terminalia in lateral view. (Scale bars = 0.2 mm). (Abbreviations: bcs: bacilliform sclerite; cerc: cerci; epand: epandrium; epi: epiproct; hypand: hypandrium; pgt: postgonite; ph: phallus; prgt: pregonite; S 5: sternite 5; S 6: sternite 6; sur: surstylus; T 7: tergite 7; T 8: tergite 8).

FIGURES 15 – 18. Male and female adults in dorsal view: 15. Pygophora immaculipennis Frey, male. 16. P. immaculipennis Frey, female. 17. P. laoensis sp. nov., male. 18. P. laoensis sp. nov., female.