Graphopsocus vietnamicus, Liang, Feiyang, Li, Fasheng & Liu, Xingyue, 2013

Liang, Feiyang, Li, Fasheng & Liu, Xingyue, 2013, Graphopsocus (Psocoptera: Stenopsocidae) newly recorded from Vietnam, with one new species, Zootaxa 3666 (1), pp. 41-48 : 42-45

Graphopsocus vietnamicus sp. n.

( Figs. 1–17 )

Diagnosis. This species is characterized by the body with pale purple markings and the forewings with a large blackish brown marking between Cu2 and 1A. Considering the female genitalia, the new species is distinguished from other species of Graphopsocus by the extremely reduced external valve.

Description. Male. Coloration (in alcohol). Head ( Figs. 3–5 ) brown, ocellar area black, genal area whitish, largely tinged with pale purple; anteclypeus whitish, postclypeus with several pale purple oblique stripes. Mouthparts brown, labrum laterally much paler, palpifer and 1st segment of maxillary palpus pale purple, remaining segments of maxillary palpus whitish. Antenna brown, scape and pedicel yellow, 1–2 flagellomeres yellow with brownish tips. Fore and mid legs mostly whitish, with coxae, apices of tibiae, apices of 1st tarsomeres, and entire 2nd tarsomeres brown; hind leg mostly brown, with trochanter, middle of tibia, and entire 2nd tarsomere whitish. Thorax dark brown. Forewings ( Fig. 9 ) transparent, with several dark markings; proximal half with a large blackish brown marking between Cu2 and 1A, and with dark brown stripe along bases of Rs and M as well as middle of stem of Cu1; distal half with brownish markings at middle and also long distal margin, forming a large and a small V-shaped patterns, but without marking on R2+3; veins whitish on proximal half, but strongly darkened on costal vein and other veins covered by dark markings, veins on distal half pale brown; R1 and R2+3 nearly parallel, Cu2 without setae. Hindwing ( Fig. 10 ) with a large brownish marking on anal region, distal margin slightly pale brown; veins whitish, slightly darker on distal half, with vein at proximal 1/4 strongly darkened. Abdomen laterally pale purple with a white marking on segments 5–6. Genital segments brownish, with epiproct and paraproct pale purple.

Measurements. Body length 2.57 mm, length from postclypeus to wing tip 4.21 mm. IO: 0.39 mm, d: 0.26 mm, IO/d=1.50, f1: 0.52 mm, f2: 0.50 mm, f3: 0.43 mm, FWL: 3.27 mm, FWW: 1.19 mm, HWL: 2.33 mm, HWW: 0.76 mm, t1: 0.43 mm, t2: 0.13 mm.

Genitalia. Paraproct ( Fig. 11 ) slightly sclerotized, angulately prominent distad, and laterally with 43 trichobothria. Epiproct ( Fig. 12 ) slightly sclerotized, subtriangular. Hypandrium ( Fig. 13 ) convex posteriad, with a broad sclerotized region, which is transversely extending laterally. Endophallus ( Fig. 14 ) strongly sclerotized, external parameres robust and broadened toward apex, with some punctures, aedeagal arch narrow.

Female. Coloration. Similar to male.

Measurements. Body length 3.03 mm, length from postclypeus to wing tip 4.57 mm. IO: 0.49 mm, d: 0.19 mm, IO/d=2.58, f1: 0.53 mm, f2: 0.42 mm, f3: 0.39 mm, FWL: 3.65 mm, FWW: 1.25 mm, HWL: 2.72 mm, HWW: 0.86 mm, t1: 0.45 mm, t2: 0.15 mm.

Genitalia. Paraproct ( Fig. 15 ) roundly prominent distad, laterally with 39 trichobothria. Epiproct ( Fig. 16 )subtriangular with round apex. Subgenital plate ( Fig. 17 ) convex posteriad, with distinct sclerotized region, which is anterolaterally extending into a pair of pterygoid lobes. Gonapophyses ( Fig.18 ) with external valve extremely reduced, fused with dorsal valve as a rather small lobe; dorsal and ventral valves narrowly elongate, with acute apex. Spermathecal sac ( Fig. 19 ) pear-shaped, with lateral pouch absent.

Type material. Holotype male, VIETNAM, Kon Tum Province, Chu Mom Ray National Park [14°29ʹN, 107°37ʹE], 1.VIII.2012, Feiyang Liang (CAU). Paratype female with same data as holotype (CAU).

Etymology. The specific name “ vietnamicus ” refers to the type locality of the new species.

Remarks. This is the first species of Graphopsocus to be recorded from Southeast Asia since 1920. It differs from the other members of the genus in the colorful body and peculiar wing markings.

Figures

FIGURE 1 – 2. Habitus of Graphopsocus vietnamicus sp. n. 1. holotype male; 2. paratype female. Scale bar = 0.5 mm.

FIGURES 3 – 8. Head of Graphopsocus vietnamicus sp. n., 3. male, frontal view; 4. male, lateral view; 5. male, dorsal view; 6. female, frontal view; 7. female, lateral view; 8. female, dorsal view. Scale bar = 0.5 mm.

FIGURES 9 – 10. Wings of Graphopsocus vietnamicus sp. nov., holotype male. 9. forewing; 10. hindwing. Scale bar = 0.5 mm.

FIGURES 11 – 14. Graphopsocus vietnamicus sp. nov., holotype male. 11. genitalia, lateral view; 12. epiproct; 13. hypandrium; 14. endophallus. aa: aedeagal arch, ep: epiproct, hy: hypandrium, pp: paraproct, pr: paramere. Scale bar = 0.05 mm.

FIGURES 15 – 19. Graphopsocus vietnamicus sp. nov., paratype female. 15. genitalia, lateral view; 16. epiproct; 17. subgenital plate; 18. gonapophyses; 19. spermathecal sac. dv: dorsal valve, ev: external valve, sg: subgenital plate, vv: ventral valve. Scale bar = 0.05 mm.