Symbiopsocus furcatus, Liu, Luxi, Li, Fasheng & Liu, Zhiqi, 2011

Liu, Luxi, Li, Fasheng & Liu, Zhiqi, 2011, Symbiopsocus Li (Psocoptera: Psocidae), with a new species from China, Zootaxa 2780, pp. 63-68 : 64-65

Symbiopsocus furcatus sp. nov.

( Figs. 1–11 )

Diagnosis. Fore wing largely clear, Rs and M fused for a short distance; epiproct invaginated proximally on each side; hypandrium symmetrical, with two pairs of lobes, posterior lobes forming V-shaped structure; phallosome rhombic; pigmented arms of subgenital plate forming V-shaped pattern at terminal ends.

Male. Coloration (in alcohol). Body generally buff. Compound eyes grayish black; ocelli pale with grayish black ocellar field. Rest of head creamy brown with dark-brown markings: band of spots bordering median ecdysial line and compound eyes dorso-medially; rhombic marking open anteriorly on frons. Antennae and labrum dark brown; apical segment and basal half of second segment of maxillary palpus ( Fig. 2 ) dark brown, remainder of maxillary palpus brown. Thorax buff, with dark brown spots. Legs brown with tibiae and tarsi dark brown. Wings ( Fig. 1 ): fore wing largely clear with light brown wash, brown spots covering pterostigma, base of fore wing and distal end of vein Cu2; hind wing clear with gray wash. Abdominal segments mostly creamy white, with narrow band of brown pigment along each side; apical region dark brown.

Morphology. Head ( Fig. 3 ) inverted triangular, with straight epicranial suture. Compound eyes ovoid. Antennae longer than fore wing. Fore wing membranous; Sc ending free in membrane, Rs and M fused for a short distance, apex angle of pterostigma moderate, distal closure of discoidal cell concave, anterior margin of areola postica in a straight line, first and second sections of Cu1a almost equal length; radial fork branches diverge at an angle less than 90°. Hind wing without marginal setae between R2+3 and R4+5. Abdomen ovoid. Phallosome ( Fig. 4 ) a rhombic frame, much longer than wide, with long apical spine and basal prong. Hypandrium ( Fig. 5 ) symmetrical with two pairs of lobes and sharp sclerotized region basally on each side; posterior lobes forming V-shaped structure and median lobes expanded basally. Epiproct ( Fig. 6 ) round, proximally invaginated on each side, with stirrup pigmented area, slightly protruding in middle over clunium; paraproct ( Fig. 7 ) broad with small apical spines, sensory field with about 29 trichobothria.

Measurements (figure for holotype male). Bw: 4322, B: 2845, FW: 3662, HW: 2710, F: 710, T: 1534, t1: 506, t2: 146, Mx4: 193, f1: 545, f2: 495, f3: 415, IO/d: 0.74.

Female. Coloration (in alcohol). Same as male (antennae lost).

Morphology. Wings as male. Subgenital plate ( Fig.8 ): egg guide moderately long, subapically invaginated and medially unpigmented, with long setae apically and short setae subapically; pigmented arms forming V-shaped pattern at terminal ends. Ovipositor valvulae ( Fig. 9 ): ventral valve elongate pointed apically; dorsal valve broad with slender distal process, ventrally with a field of short setae from subapex to middle; outer valve elliptical, with moderate round posterior lobe and long setae. Epiproct ( Fig.10 ) triangular, with a field of setae on distal half; paraproct ( Fig.11 ) triangular, absence of apical spine, sensory field with about 27 trichobothria.

Measurements (figure for a female collected from Leigong Mountain Nature Reserve). Bw: 4917, B: 3715, FW: 4268, HW: 3244, F: 922, T: 1943, t1: 507, t2: 153, Mx4: 182, IO/d: 1.59.

Material examined. Holotype male, CHINA: Guizhou Province, Kuankuoshui Nature Reserve, 13.viii.2010, Luxi Liu ( CAU). Paratypes, CHINA: 1 male, same location and collector as holotype, 10.viii.2010; 2 males, same location and collector as holotype, 11.viii.2010; 1 male and 1 female, Guizhou Province, Leigong Mountain Nature Reserve, 14.iv.2005, Yi Tang (Guizhou); 1 male and 1 female, Sichuan Province, Emei Mountain, 15.vii.2010, Junchao Wang ( CAU).

Distribution. China (Guizhou, Sichuan).

Etymology. The specific name refers to the characteristic V-shaped posterior lobes of the hypandrium.

Remarks. This new species is similar to S. quadripartitus Li and S. subrhombeus Li in fore wing pattern, in having a symmetrical hypandrium with two pairs of lobes, and in having a rhombic phallosome. It can be distinguished easily by the V-shaped structure of posterior lobes and sharp sclerotized regions basally on hypandrium.

Figures

FIGURES 1 – 7. Symbiopsocus furcatus sp. n. Male. (1) Fore and hind wing. (2) Maxillary palpus. (3) Front view of head. (4) Phallosome (front view and side view). (5) Hypandrium. (6) Epiproct. (7) Right paraproct. Scales in mm. Figures 4 – 7 to common scale.

FIGURES 8 – 11. Symbiopsocus furcatus sp. n. Female. (8) Subgenital plate. (9) Ovipositor valvulae. (10) Epiproct. (11) Right paraproct. Scales in mm. Figures 8 – 11 to common scale.