Symbiopsocus yangminus, Liu & Li & Liu, 2014

Liu, Luxi, Li, Fasheng & Liu, Zhiqi, 2014, A new species of Symbiopsocus Li (Psocodea: “ Psocoptera ”: Psocidae) from Taiwan, China, with a revised checklist and key to species, Zootaxa 3774 (3), pp. 289-294 : 290-292

Symbiopsocus yangminus sp. n.

Male. Coloration (in alcohol). Body generally brown. Compound eyes grayish black; ocelli brown with dark brown ocellar field. Rest of head brown with dark brown markings. Antennae dark brown. Maxillary palpi brown with distal segment darker. Thorax dark brown, with membranous regions paler. Legs brown, with coxa and tarsi dark brown. Wings ( Fig. 1 ): Fore wing hyaline with light brown wash, brown spots covering pterostigma, base of fore wing and distal end of vein Cu 2, veins brown; hind wing clear with gray wash. Abdominal segments creamy brown, with narrow band of brown pigment along each side; apical region dark brown.

Morphology. Head inverted triangular, with epicranial suture slightly concave. Compound eyes ovoid. Antennae protruding slightly beyond distal tip of fore wing. Fore wing membranous, glabrous; Sc ending free in membrane, Rs and M connected by very short crossvein; pterostigma triangular with apex moderately rounded; distal closure of discoidal cell convex; areola postica triangular, anterior margin of areola postica in a straight line, first section of Cu 1a little longer than the second section; radial fork branches diverge at angle less than 90°. Hind wing without marginal setae between R 2+3 and R 4+5. Abdomen ovoid.

Phallosome ( Fig. 3&4 ) a rhombic frame, much longer than wide. Hypandrium ( Fig. 5&6 ) almost symmetrical with two tiers of bilateral lobes; dorsal lobes weakly sclerotized and forming V-shaped structure; ventral lobes strongly sclerotized, lateral margin covered with denticles, each with a spine at bottom; median tongue-like structure extending between ventral lobes. Clunium ( Fig. 7 ) with dorsal margin slightly concave posteriorly. Epiproct ( Fig. 7 ) round and unsclerotized medially, slightly extended anterodorsally over clunium, anteromedially with a cone-shaped projection; paraproct ( Fig. 7 ) broad with small apical spine, sensory field with about 28 trichobothria.

Measurements. Bw: 3645, B: 2814, FW: 2858, HW: 2186; F: 585, T: 1236, t1: 436; t2: 132, f1: 363, f2: 332, f3: 297, Mx4: 155, IO/d: 0.868.

Female. Coloration (in alcohol). Same as the male. Wings ( Fig. 2 ): Fore wing hyaline with light brown wash, dark brown spots covering pterostigma, and end of vein Cu 2, veins brown; hind wing clear with gray wash. Abdominal segments yellowish with brown markings.

Morphology. Head same as the male. Fore wing membranous, glabrous; Sc ending free in membrane, Rs and M connected by short crossvein; pterostigma triangular, anterior margin of areola postica in a straight line, first and second sections of Cu 1a almost equal in length; radial fork branches diverge at angel less than 90°. Hind wing without marginal setae between R 2+3 and R 4+5. Abdomen ovoid. Subgenital plate ( Fig. 8 ) with egg guide long, medially unpigmented and apically with long setae; pigmented arms forming V-shaped pattern at terminal ends. Ovipositor valvulae ( Fig. 9 ): ventral valve slender and pointed apically; dorsal valve broad with slender distal process; outer valve narrow, with moderate round posterior lobe and long setae. Epiproct triangular, with a field of setae on distal half; paraproct triangular, apical spine absent, sensory field with about 26 trichobothria.

Measurements. Bw: 3783, B: 2913, FW: 3122, HW: 2345; F: 585, T: 1285, t1: 375; t2: 118, f1: 596, f2: 578, f3: 496, Mx4: 173, IO/d: 2.047.

Material examined. Holotype male, CHINA: TAIWAN, Taipei, Yangming Mountain, Tianmu Road, 17.vi.2012, Luxi Liu ( CAU) . Paratypes: 1 female and 6 males, same data as holotype .

Etymology. The species name refers to the type locality.

Remarks. This new species appears to be closely related to S ymbiopsocus bicruris from China, based on similarity of the hypandrium with two pairs of bilateral lobes and median tongue-like structure. However, it can be distinguished from S. bicruris by Rs-M crossvein in fore wing, smaller median structure in hypandrium and different shape of phallosome. Another species from Taiwan, S. formosanus , is separated from the new species by lacking cone-shaped projection of male epiproct and median structure in hypandrium.

Figures

FIGURES 1–2. Wings of Symbiopsocus yangminus sp. n., (1) male wings. (2) female wings.

FIGURES 3–9. 3–7. Male genitalia of Symbiopsocus yangminus sp. n., (3) Phallosome, ventral view. (4) Phallosome, lateral view. (5) Hypandrium, posterior view. (6) Hypandrium, lateral view. (7) Epiproct & paraproct, dorsal view. 8–9. Female genitalia of Symbiopsocus yangminus sp. n., (8) Subgenital plate. (9) Ovipositor valvulae.