Symbiopsocus, Li, 1997

Ning, Jinjin, Li, Fasheng & Liu, Xingyue, 2020, The first record of the bark louse genus Symbiopsocus (Psocodea: Psocidae) from Vietnam, with description of a new species, Zootaxa 4759 (3), pp. 413-420 : 414

Key to species of Symbiopsocus

Males

1. Hypandrium with one tier of lobes ( Li 2002: Fig. 1262G)..................................................... 2

- Hypandrium with two or more tiers of lobes ( Li 2002: Fig. 1263E).............................................. 3

2. Phallosome ovoid, basally expanded ( Li 2002: Fig. 1262E).......................................... diplocyclus Li

- Phallosome long and narrow ( Li 2002: Fig. 1268E–F)............................................... ternatus (Li)

3. Hypandrium with median tongue-like structure ( Yoshizawa & Mockford 2012: Fig. 2C )............................. 4

- Hypandrium without median tongue-like structure ( Yoshizawa 2008: Fig. 2C ).................................... 10

4. Hypandrium with median tongue-like structure divided bilaterally with narrow notch posteriorly ( Yoshizawa & Mockford 2012: Fig. 2C )........................................................................................ 5

- Hypandrium with median tongue-like structure not divided bilaterally with narrow notch posteriorly ( Li 2002: Fig. 1264G).. ................................................................................................... 6

5. Median tongue-like structure of hypandrium with a pair of processes extending from dorsal surface near base of tongue directed postero-laterally ( Yoshizawa & Mockford 2012: Fig. 2C )........................................ hastatus Mockford

- Median tongue-like structure of hypandrium without process extending from dorsal surface near base of tongue directed posterolaterally ( Li 2002: Fig. 1270G)........................................................ multimacularis (Li)

6. Forewing with short spur vein ( Li 2002: Figs 1271B, 1272B).................................................. 7

- Forewing without spur vein............................................................................. 8

7. Forewing Rs and M meeting at a point; phallosome long and narrow, not curved medially................. dolichosus (Li)

- Forewing Rs and M connected by a crossvein; phallosome curved medially, nearly with angle of 90° ( Li 2002: Fig. 1272E–F)..................................................................................... septangulatus (Li)

8. Hypandrium with median tongue-like structure relatively large; phallosome curved ( Li 2002: Figs 1264G, 1264E–F)................................................................................................. bicruris (Li)

- Hypandrium with median tongue-like structure smalle; phallosome long and narrow, not curved....................... 9

9. Hypandrium with a pair of spines on bottom of ventral lobe ( Liu et al. 2014: Fig. 5)................ yangminus Liu & Liu

- Hypandrium without spines on bottom of ventral lobe.......................................... ophiocephalus (Li)

10. Hypandrium basally with fine spines ( Li 2002: Fig. 1266G)................................................... 11

- Hypandrium basally smooth, without spines............................................................... 13

11. Ventral and dorsal lobes of hypandrium covered with minute denticles ( Yoshizawa 2008: Fig. 2C )... formosanus (Okamoto)

- Ventral and dorsal lobes of hypandrium smooth ( Li 2002: Fig. 1266G).......................................... 12

12. Hypandrium basally with five spines ( Li 2002: Fig. 1266G)........................................ chaulommaus Li

- Hypandrium basally with an area of small spines ( Li 2002: Fig. 1269F).............................. subrhombeus Li

13. Epiproct proximally flat..................................................................... longicaulis (Li)

- Epiproct proximally invaginated on each side.............................................................. 14

14. Hypandrium asymmetrical ( Li 2005: Fig. 15E)....................................................... yajunae Li

- Hypandrium symmetrical.............................................................................. 15

15. Forewing with Sc ending in Rs................................................................ leptocladus Li

- Forewing with Sc ending free in membrane................................................................ 16

16. Epiproct anteromedially with a short cone-shaped projection ( Liu et al. 2011: Fig. 6)............................... 17

- Epiproct anteromedially without cone-shaped projection......................................... quadripartitus Li

17. Hypandrium basally with sharp sclerotized region on each side ( Liu et al. 2011: Fig. 5)................ furcatus Liu & Liu

- Hypandrium basally without a sharp sclerotized region ( Fig. 3D )................................ vietnamicus sp. nov.

Figures

FIGURE 2. Symbiopsocus vietnamicus sp. nov., paratype female. A. Habitus, lateral view; B. Head, frontal view; C. Head, dorsal view; D. Forewing; E. Hind wing. Scale bar = 0.5 mm.

FIGURE 3. Symbiopsocus vietnamicus sp. nov., paratype male.A–B. Epiproct and paraproct; C–D. Hypandrium; E. Genitalia, lateral view; F: Phallosome, ventral view; G: Phallosome, lateral view. ep: epiproct; pp: paraproct, hy: hypandrium, ph: phallosome. Scale bar = 0.2 mm.