Trichosomaptera gibbosa, Pham, Minhlan, Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2014

Pham, Minhlan, Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2014, Aradidae from Vietnam III. Trichosomaptera gibbosa n. gen., n. sp., an apterous Carventinae (Hemiptera: Heteroptera: Aradidae), Zootaxa 3768 (3), pp. 395-400 : 396-399

Trichosomaptera gibbosa n.sp. Bai, Heiss & Cai

(Photos 1–16)

Material examined: Holotype male labelled: Vietnam, Lam Dong Prov. / Bidoup Nui Ba National Park / Giang Ly, 1500 m / N 12 0 11.085 E 108 0 41.051 / 11 V 2012, M. L. Pham// Holotype male / Trichosomaptera n.gen. / gibbosa n.sp. / des. Bai,Heiss,Cai 2013 // ( CAU). Paratypes: 3 males, 4 females, same data as holotype ( CAU, EMIH, CEHI); 2 males, 1 female, Vietnam, Lam Dong Prov. / Da Lat, 1500 m / N 12 0 30 ’ E 108 0 25 / 7 VII 2011 Pham // ( CAU, CEHI); 2 males, 6 females, same location as above, 23–24.IX.2011, Bai & Pham leg. ( CAU, CEHI). The paratypes are designated and labelled accordingly.

Description. Male, apterous; coloration ferruginous red, surface with glabrous areas and structures with erect yellowish setae; abdomen subparallel, truncate posteriorly (photo 1).

PHOTOS 1–6. Trichosomaptera gibbosa n. gen. n. sp. 1,2,3— paratype male; 4,5,6— paratype female. 1,2—dorsal view; 2,5—lateral view; 3,6—ventral view. Scale bar 1.1mm.

PHOTOS 7–16. Trichosomaptera gibbosa n. gen. n. sp., genitalic structures of male. 7,8,9—pygophore in dorsal, lateral and ventral view; 10,11,12,13—right paramere in different positions; 14,15,16—phallus in dorsal, lateral and ventral view. Scale bar 0.4mm for photo 7–9; 0.2mm for photos 10–13; 0.33mm for photos 14–16.

Head. About 1.37x as long as width across eyes; clypeus conical longitudinally raised with a preapical tubercle, reaching 2/5 of antennal segment I; genae thin as long as clypeus; antenniferous lobes diverging anterolaterally with subacute apex; antennae about 1.87 x as long as width of head across eyes; segment I longest and thickest beset with long erect setae, II thinner with short appressed setae tapering toward base, III thinnest, pedunculate at base, IV shortest, fusiform with pilose apex; length of antennal segments I–IV = 0.5 /0.3 /0.4 / 0.3 mm; eyes distinctly stylate; postocular lobes straightly converging posteriorly to constricted neck, lateral margins with erect setae; vertex with 2(1+1) longitudinal ridges beset with shorter erect setae with a deep groove between them.

Pronotum. Much wider than long, lateral sclerites raised with tufts of erect setae, their lateral margins rounded; median depression glabrous with a short longitidinal groove posteriorly, collar ring-like; posterior margin strongly convex at middle, separated from mesonotum by a deep groove.

Mesonotum. Strongly transverse with raised lateral sclerites beset with erect setae, lateral margins rounded; median sclerite depressed with 2(1+1) oval longitudinal ridges beset with long setae, a deep groove between them; this sclerite posteriorly protruding and fused to metanotum without a visible suture; posterior margins laterally of median sclerite arcuate and marked by deep grooves.

Metanotum. Much wider than long, structure of large oval lateral lobes of metanotum as of mesonotum; median glabrous and slightly concave sclerite fused to mesonotum and mtg I+II; these with 2(1+1) tufts of setae lateral of median plate, lateral parts glabrous punctate and sloping.

Abdomen. Anterior margin of tergal plate strongly convex at middle, lateral margins rounded, posterior margin slightly concave; mtg III raised into a distinct oval hump, its surface densely beset with long setae; median ridge like elevation of mtg IV–VI smooth, lateral parts glabrous with deep punctures; deltg II+III fused, III–VII separated by sutures; their surface with apodemal impressions laterally delimited by a longitudinal carina along lateral margin; mtg VII raised medially for reception of pygophore; lateral margins of deltg IV–VII with increasing angular projections on anterior half bearing spiracles IV–VII which are visible from above.

Venter. Spiracles II ventral, III–IV sublateral, V–VII lateral on distinct tubercles, all except II visible from above, VIII terminal on ptg VIII; pro-, meso, and metasternum fused to mst II+III forming a smooth glabrous polygonal plate (photo 3,6); mst IV–VI smooth at middle, rugose laterally; sternite VII with a longitudinal smooth ridge medially and with 2(1+1) tubercles on either side.

Genitalic structures. Pygophore (photo 7–9) conical with a dorsal posteriorly constricted conical ridge; ptg VIII short and clavate, parameres slender with hook-like apex (photo 10–13), phallus as photo 14–16.

Female. Generally as male but of larger size and posteriorly constricted abdomen; elevated hump of mtg III well developed as in male (photo 4,5); mst VII with convex anterior margin, ptg VIII shorter than posteriorly produced tricuspidate tergites IX+X.

Measurements. Holotype male: Length 4.6, width of abdomen 2.0; head length/width 1.1 / 0.8; pronotum l / w 0.6 / 1.4; Scutellum l / w 0.5 / 0.6; pygophore l / w 0.4 / 0.7. Paratypes ♂ (n=4), ♀ (n=4)]. Length ♂ 4.15–4.58, ♀ 5.42–5.44; width of abdomen ♂ 2.10–2.47, ♀ 2.81–2.93; head length ♂ 0.94–1.09, ♀ 1.12–1.18; width ♂ 1.04– 1.14, ♀ 1.27–1.29; pronotum ♂ 0.47–0.54, ♀ 0.55–0.58; width ♂ 1.38–1.57, ♀ 1.74–1.74. Length of antennal segments I–IV: length ♂ 0.43–0.46, 0.31–0.34, 0.48–0.56, 0.36–0.41; ♀ 0.51–0.52, 0.36–0.37, 0.56–0.59, 0.42; pygophore length 0.41–0.51, width 0.64–0.72.

Etymology. Refers to the median gibbous hump of mtg III.

Distribution. The only known species was found in Lam Dong Province of Vietnam.