Rotundocoris Bai & Heiss, 2019

Qian, Hongge, Bai, Xiaoshuan, Heiss, Ernst, Liu, Aiping & Cai, Wanzhi, 2019, Rotundocoris, a new apterous genus of Carventinae from China (Heteroptera: Aradidae), Zootaxa 4623 (3), pp. 526-534 : 527

Rotundocoris Bai & Heiss , gen. nov.

Type species. Rotundocoris stenonotum Bai & Heiss , sp. nov.

Diagnosis. Apterous, of small size (4.32–5.65 mm), habitus elongate oval; coloration reddish brown, surface glabrous; lateral margins of body, legs and antennae with setigerous tubercles; thoracic segments fused to mtg I+II, a median longitudinal sclerite reaching from pronotum to tergal plate, bottle-shaped along meso- and metanotum, then restricted and depressed and carinate along mtg I+II, fusion line between metanotum and mtg I+II marked by suture; spiracles II ventral, III–IV sublateral, IV at most faintly visible from above, V–VII lateral and visible from above. Male vltg VII with shiny large oblique callus.

Rotundocoris gen. nov. resembles Bruneiaptera Heiss, 2011 from Borneo and Paralibiocoris Bai, Heiss & Cai, 2018 from China sharing basic habitus and dorsal thoracic structures, however in Bruneiaptera all spiracles (II-VII) are lateral and visible from above and lacks the callus on male vltg VII; in Paralibiocoris spiracles II are ventral, III-VII lateral and visible from above and the pygophore is elongate, posteriorly produced (vs. shorter, conically rounded).

Description. Head. Longer than wide across eyes; genae slender, apices acute; antenniferous tubercles stout, conical, apically pointed; antennae long and slender, first segment stout and clavate, longest, second cylindrical, third longer than second and cylindrical, fourth fusiform, shortest or as long as second; eyes small, semiglobose with convex face; postocular tubercles small and not reaching outer margin of eyes, converging posteriorly to constricted neck; rostrum arising from a slit-like atrium not reaching limits of rostral groove.

Thorax and mtg I+II. Pronotum attenuated anteriorly, anterolateral angles produced and forming blunt or round- ed lobes, reaching to or slightly protruding beyond collar, disc with median groove, separated from mesonotum by a transverse intersegmental furrow; meso- and metanotum separated only laterally, the elevated median ridge smooth or with longitudinal sulcus, bottle-shaped; lateral sclerites with longitudinal elevations; metanotum separated from fused mtg I+II by a narrow transverse sulcus.

Abdomen. Mtg III–VI fused into a subrectangular tergal plate, elevated along midline with usual pattern of large and small callous spots and dots; mtg VII strongly elevated posteriorly in male and slightly elevated in female; pygophore cordate; paratergites VIII clavate or lobiform.

Venter. Prosternum raised with longitudinal elevation at middle, anteriorly granulate; meso- and metasterna fused, flattened medially. Spiracle VIII terminal on ptg VIII. Male vltg VII with shiny large oblique callus.

Legs. Long and slender, without spines, preapical comb on fore tibia present, femora subcylindrical, claws with fine pulvilli.

Etymology. The generic name reflects the rounded abdomen of the species.

Distribution. China (Hainan).