Dipsocus fashengi, Jie & Liang & Liu, 2022

Jie, Lulan, Liang, Feiyang & Liu, Xingyue, 2022, Dipsocus gen. n.: A new bark louse genus of the tribe Thyrsophorini (Psocodea: Psocidae: Psocinae), with description of a new species from China, Zootaxa 5222 (1), pp. 94-100 : 96-99

Dipsocus fashengi sp. n.

( Figs 1–23 )

Diagnosis. Forewing basal third with brown marking, but basal half of cell r hyaline; distal half with a trifurcated brown marking. Pterostigma pale yellow but distally reddish brown. Male hypandrium symmetrical, divided into two parts, basal part strongly sclerotized, distal part weakly sclerotized, basally with a tongue-shaped thickened marking in median area, distally concaved with two nephroid sclerotized areas on inner margin. Female subgenital plate pigmentation with stem thread-like and distally bifurcated.

Description. Male. Coloration (in 95% ethanol). Head ( Figs 1–3 ) reddish brown; vertex with black setae; postclypeus reddish brown with brown stripes; anteclypeus reddish brown. Ocelli pale, inner ocular margin surrounded by black protuberant crescent. Compound eyes dark brown.Antennae dark brown, except scape, pedicel, and first flagellomere pale yellow, flagellum with numerous long dark setae, except first flagellomere pale yellow setae. Maxillary palpus black. Thorax ( Figs 1, 3 ) dark brown, but basal mesothorax greyish white. Legs yellowish brown, but tibiae and tarsi pale brown. Forewing ( Fig. 4 ) veins brown; basal one-third with brown marking, but basal half of cell r hyaline; distal half with a trifurcated brown marking; pterostigma pale yellow except for anterior reddish brown. Hindwing ( Fig. 5 ) hyaline, with pale brown markings at cell CuP and A. Abdomen reddish brown, dorsomedially with six white dots.

Morphology. Head ( Figs 1–3 ) inverted trapezoidal; compound eyes ovoid. Forewing ( Fig. 4 ) membranous, Sc ending free; Rs and M connected by a crossvein; radial fork with branches diverging at an angle less than 90°; pterostigma subtriangular with rounded apex; discoidal cell rhomboid-shaped; areola postica with narrow apex. Hindwing ( Fig. 5 ) without marginal setae between R 2+3 and R 4+5. Genitalia ( Figs 6–12 ): Epiproct ( Figs 7–8 ) nearly semicircular, laterally slightly sclerotized, lateromedially setose.Paraproct with broadened base and distally narrowed into spinous projection; sensory field with about 46 trichobothria. Hypandrium ( Figs 6–7, 9–10 ) symmetrical, basal two-third strongly sclerotized, distal one-third weakly sclerotized, basally with a tongue-like sclerotized marking in median area, distally concaved with two nephroid sclerotized areas at inner margin. Phallosome ( Figs 11–12 ) posteriorly closed, drop-like in frontal view.

Measurements. B: 3.15 mm. IO: 0.48 mm, d: 0.36 mm, IO/d: 1.33. f1: 1.64 mm. FWL: 5.09 mm, FWW: 1.82 mm, HWL: 3.39 mm, HWW: 1.16 mm, t1: 0.42 mm, t2: 0.24 mm.

Female. Coloration (in 95% ethanol) ( Figs 13–17 ). Similar to that in male except for thorax black.

Morphology. Adult similar to male except smaller compound eyes. Genitalia ( Figs 18–23 ): Epiproct ( Figs 18– 19 ) subtriangular, distally rounded, medially with setae. Paraproct ( Figs 18–19 ) triangular, sensory field with about 40 trichobothria. Gonapophyses ( Figs 20–21 ): Ventral valve slender, distally narrowed, ventrodistally serrated; dorsal valve broad, pointed at tip, distally one-third with ovoid sclerotized marking; external valve with triangular posterior lobe. Subgenital plate ( Figs 22–23 ) with short and distally rounded egg guide; pigmented area roughly Tshaped, transversal region laterally broadened with densely setae, stem thread-like and distally bifurcated.

Measurements. B: 4.73 mm, BW: 7.32 mm. IO: 0.83 mm, d: 0.34 mm, IO/d: 2.44. f1: 1.75 mm. FWL: 6.60 mm, FWW: 2.52 mm, HWL: 4.51 mm, HWW: 2.23 mm.

Material examined. Holotype male, CHINA: Guangxi, Shangsi County, Shiwandashan [21°45'N, 108°21'E], 26.V.2016, Xingyue Liu ( CAU) . Paratypes: 1 female, 1 male same as holotype ( CAU) ; 2 females, CHINA: Guangxi, Shangsi County, Fulong [21°49'N, 107°57'E], 16. V.2013, Xingyue Liu ( CAU) .

Distribution. China (Guangxi).

Etymology. The new species is dedicated to deceased Mr. Fasheng Li, who had made significant contributions to the taxonomy of Psocodea from China.

Figures

FIGURES 1–5. Dipsocus fashengi sp. n., paratype male. 1. Habitus, lateral view; 2. Head, frontal view; 3. Habitus, dorsal view; 4. Forewing; 5. Hindwing.

FIGURES 6–12. Dipsocus fashengi sp. n., paratype male. 6. Genitalia, dorsal view; 7. Genitalia, dorsal view; 8. Epiproct and paraproct, dorsal view; 9. Hypandrium, dorsal view; 10. Hypandrium, lateral view; 11. Phallosome, dorsal view; 12. Phallosome, lateral view. ep: epiproct; pp: paraproct. ph: phallosome; hyp: hypandrium.

FIGURES 13–17. Dipsocus fashengi sp. n., holotype female. 13. Habitus, lateral view; 14. Habitus, dorsal view; 15. Habitus, frontal view; 16. Forewing; 17. Hindwing.

FIGURES 18–23. Dipsocus fashengi sp. n., holotype female. 18. Genitalia, dorsal view; 19. Epiproct and paraproct, dorsal view; 20. Genitalia, lateral view; 21. Gonapophyses, ventral view; 22–23. Subgenital plate, ventral view. ep: epiproct; pp: paraproct; vv: ventral valve; dv: dorsal valve; ev: external valve.