Aradidae from Vietnam III. Trichosomaptera gibbosa n. gen., n. sp., an apterous Carventinae (Hemiptera: Heteroptera: Aradidae) Author Pham, Minhlan Author Bai, Xiaoshuan Author Heiss, Ernst Author Cai, Wanzhi text Zootaxa 2014 3768 3 395 400 journal article 46342 10.11646/zootaxa.3768.3.7 462738a4-2ebf-4021-b774-a17c24b40a6f 1175-5326 230168 689DB881-F95E-46D9-8A24-AA91D28DE593 Trichosomaptera new genus Bai, Heiss & Cai Type species: Trichosomaptera gibbosa n.sp. Diagnosis. Resembling the apterous genus Dasyaptera Usinger & Matsuda 1959 but is distinguished from the latter by the stylate eyes (eyes not stylate), more slender and longer antennae about 1.36x as long as head (as long as head), a narrower head about 0.7x as wide as long (as wide as long), by mtg III strongly elevated medially into a subcylindrical pilose hump (without such hump), and by spiracles II ventral and not visible from above (all spiracles lateral and visible from above). Description. Small-sized apterous. Body elongate oval, surface structures partially with dense pilosity, uncovered parts glabrous and shiny; elevated thoracic lobes and hump of mtg III beset with tufts of long stiff yellowish setae. Legs and antennal segment I beset with long curved setae. Head. Distinctly longer than width across eyes; clypeus prominent, genae thin as long as clypeus; antenniferous lobes short and stout diverging anterolaterally with subacute apex; antennae about 1.9x as long as width of head across eyes, segment I longest with long stiff setae, these curved at apex, II shorter, III with a long petiole, IV shortest; eyes stylate; postocular lobes very long, converging posteriorly, lateral margin beset with stiff erect setae, these more dense on carinate vertex. Rostrum arising from a slit-like atrium, not reaching limits of rostral groove. Rostral groove deep and wide at base, open posteriorly. Pronotum . Nearly 3x as wide as long; collar distinct; lateral lobes elevated and pilose, depression between them glabrous; posterior margin distinctly delimited by a deep transverse medially convex groove. Meso- and metanotum. Fused at middle to each other and to mtg I+II, the mesonotal part of this median sclerite with 2(1+1) oval pilose ridges separated by a deep cleft followed posteriorly by a glabrous concave plate belonging to metanotum and mtg I+II; lateral lobes of metanotum raised and pilose, fused mtg I+II with tuft of setae lateral of median plate, lateral parts glabrous and sloping. Abdomen . Tergal plate subrectangular consisting of fused mtg III–VI; mtg III strongly raised medially into a subcylindrical hump, its apex covered by long stiff setae; mtg IV–VI elevated medially into a smooth ridge, lateral parts glabrous; deltg I+II fused; deltg III–VII separated by sutures; lateral margins of deltg IV–VII with posteriorly increasing angular projections bearing spiracles IV–VII which are visible from above; mtg VII raised medially. 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; 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; pygophore conical and constricted posteriorly, ptg VIII clavate. Legs. Long and slender beset with erect setae; femora only feebly incrassate, trochanters fused to femora; tarsi short, claws with thin pulvilli. Etymology . Referring to the conspicuous body structures, from>trichos<(Greek) hairy,>soma<(Greek) body and its apterous condition. Distribution. Only one species from Vietnam is known to date. Discussion . The presence of the striking dorsal hump on mtg with long yellowish tufts of setae is unique among the family Aradidae . This hump seems to be an obstacle when copulating and a disadvantage for the life in subcortical or leaf litter habitats where they occur. Thus its function remains unknown.