Sigmatoneura pinbiensis, Liu, Luxi, Li, Fasheng & Liu, Zhiqi, 2011

Liu, Luxi, Li, Fasheng & Liu, Zhiqi, 2011, The genus Sigmatoneura Enderlein (Psocoptera: Psocidae), with two new species from China, Zootaxa 2999, pp. 33-41 : 34-37

Sigmatoneura pinbiensis sp. nov.

( Figs. 1–11 )

Male. Coloration (in alcohol). Body generally buff. Head ( Fig. 1 ) creamy brown, without dark brown markings. Compound eyes grayish black; ocelli black. Antennae and maxillary palpi brown. Thorax buff. Legs creamy yellowish. Fore wing ( Fig. 2 ) hyaline with light brown markings basally, pterostigma fully light brown with a light brown band along proximal margin; hind wing ( Fig. 3 ) hyaline, with light brown markings basally and along distal end of R1. Abdominal segments creamy brown; apical regions dark brown.

Morphology. Head small, epicranial suture concave and distinct. Fore wing: pterostigma with moderate hind angle, Rs-M crossvein very long, distal margin of discoidal cell straight, Cu1a and M connected by a crossvein or meeting at a point, radial fork branches diverge at an angle more than 90°. Hind wing without marginal setae between R2+3 and R4+5. Hind tibia normal. Abdomen ovoid. Phallosome ( Fig. 4 ) a frame, longer than wide, acuminate proximally and broad distally, with posterior margin concave medially. Hypandrium ( Fig. 5 ) with membranous regions anteromedially and marginally, sclerotized arms forming broad V-shaped regions. Epiproct ( Fig. 6 ) with unsclerotized regions distomedially; paraproct ( Fig. 7 ) round, with a strong apical spine, sensory field with about 39 trichobothria.

Measurements. Bw: 6384, B: 4142, FW: 5367, HW: 3533, F: 1512, T: 2984, t1: 520, t2: 293, Mx4: 253, f1: 2112, f2: 2106, f3: 2062, IO/d: 2.215.

Female. Coloration (in alcohol). Same as the male. Fore wing ( Fig. 8 ) brown wash, with pale areas anteriorly and along posterior wing margin; pterostigma unpigmented; veins pale in following regions: basal 1/2 part of R2+3, basal 2/3 part of R4+5, apex of areola postica, Cu1b and first section of Cu1a. Hind wing ( Fig. 9 ) hyaline, with light brown pigmented at basal part.

Morphology. Head same as the male. Fore wing: pterostigma with moderate hind angle, Rs-M crossvein short, distal margin of discoidal cell slightly concave, Cu1a and M meeting at a point or fused for a short distance; vein R4+5 strongly curving back after radial fork so as to approach M, radial fork branches diverge at an angle about 150°. Hind wing without marginal setae between R2+3 and R4+5. Hind tibia normal. Abdomen ovoid. Subgenital plate ( Fig. 10 ): sclerotized arms anteriorly forming broad T-shaped regions and distally a hemicycle region; egg guide short, round apically and invaginated basally. Ovipositor valvulae ( Fig. 11 ): ventral valve slender; dorsal valve broad, with two lamellar structures distally; outer valve elliptical, without posterior lobe. Epiproct triangular, with a field of setae medially; paraproct triangular, without apical spine, sensory field with about 45 trichobothria.

Measurements. Bw: 8782, B: 5124, FW: 7267, HW: 5233, F: 1982, T: 2991, t1: 587, t2: 360, Mx4: 280, f1: 1896, f2: 2263, f3: 2321, IO/d: 3.921.

Material examined. Holotype male, CHINA: Yunnan Province, Pingbian, 25.v.2009, Xiushuai Yang ( CAU). Paratypes, CHINA: 2 males and 3 females, same as holotype.

Distribution. China (Yunnan).

Etymology. The species name refers to the type locality.

Remarks. The new species can be distinguished from the other species of the genus Sigmatoneura by pale coloration both in body and wings. Distal segments of maxillary palpi and legs are not dark colored in this species. In fore wing venation, it is similar to S. clara Li & Yang and S. coronata Li , but the shape of phallosome frame, and sclerotization regions of hypandrium and subgenital plate are different.

Figures

FIGURES 1 – 7. Sigmatoneura pinbiensis sp. nov. Male. (1) Front view of head. (2) Fore wing. (3) Hind wing. (4) Phallosome. (5) Hypandrium. (6) Epiproct. (7) Paraproct. Scales in mm. Figures 2 – 3 and figures 4 – 7 to common scale.

FIGURES 8 – 11. Sigmatoneura pinbiensis sp. nov. Female. (8) Fore wing. (9) Hind wing. (10) Subgenital plate. (11) Ovipositor valvulae. Scales in mm. Figures 8 – 9 and figures 10 – 11 to common scale.