Rotundocoris obliquonotum 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 : 530-531

Rotundocoris obliquonotum Bai & Heiss , sp. nov.

( Figs. 18–34 )

Type material. Holotype (♂): China, Hainan, Baisha, Yinggeling , 950 m, 7.v.2008, leg. X. S. Bai ( IMNU).

Paratypes: China, Hainan, Baisha, Yinggeling , 950 m, 7.v.2008, leg. X. S. Bai (2 ♂♂, IMNU) ; China, Hainan, Jianfeng, Chahekou , 217 m, 18.viii.2007, leg. X. S. Bai (3 ♂♂, 2 ♀♀, IMNU, CEHI) ; China, Hainan, Jianfeng, Beiganxian , 820 m, 9.viii.2007, leg. X. S. Bai (2 ♂♂ ♀, IMNU, CEHI) ; China, Hainan, Ledong, Jianfengling , 28.iv.2009, leg. Zhang & Yang (♀, IMNU) ; China, Hainan, Limu montain, 6.v.2008, leg. X. S. Bai (3 ♂♂, IMNU) ; China, Hainan, Jianfeng, Tianchi , 16.viii.2007, leg. Zhang & Bai (1 ♂ 1 ♀, CEHI) ; China, Hainan, Changjiang, Bawangling , 13.ix.2008, leg. W. J. Zhang (♀, CEHI) ; provided with type labels accordingly.

Diagnosis. General aspect similar to Rotundocoris stenonotum sp. nov., but distinguished from the latter by wider pronotum 2.67 times as wide as long (2.53), anterolateral lobes widely rounded and protruding beyond collar (anterolateral angles produced and forming blunt lobes, reaching to anterior margin of collar); longer antennae 2.39 times as long as width of head (2.13); and across meso- and metanota medially with an elongate, subpentagonal bottle-shaped ridge with longitudinal sulcus (without longitudinal sulcus, smooth).

Description of male. Head. Slightly longer than wide across eyes (0.92: 0.78); genae notched anteriorly, reaching about basal fourth of first antennal segment; clypeus strongly raised anteriorly, with tubercle near apex; antenniferous tubercles short, dilated, apices acute; antennae 2.39 times as long as width of head across eyes, length of antennal segments I to IV= 0.61: 0.34: 0.58: 0.34; eyes small, convex; postocular tubercles small and not reaching outer margin of eyes, postocular lobes strongly constricted posteriorly; vertex with granulate carinae flanked by a pair of large, ovate infraocular callosities.

Pronotum. 2.67 times as wide as long (1.36: 0.51), strongly attenuated anteriorly; collar narrow; anterolateral angles produced and forming rounded lobes, reaching slightly beyond collar; disc with a longitudinal median furrow, flanked by a pair of subtriangular plates which meet at anterior margin, disc laterad with a pair of large subtriangular plates with irregular callosities, granulate carinae laterally; posterior margin of pronotum slightly convex separated from mesonotum by a deep furrow.

Mesonotum. Wider than pronotum (1.67: 1.36); separated laterally from metanotum by very deep furrows; across meso- and metanota medially with an elongate, subpentagonal bottle-shaped ridge, 1.6 times as long as wide (0.82: 0.51), subrounded anteriorly and truncate posteriorly, smooth and with longitudinal sulcus; laterad of median ridge with a pair of subrectangular plates with irregular callosities and granulate carinae along lateral margin.

Metanotum. Wider than mesonotum(1.94: 1.67); separated from fused mtg I+II by a straight thin sulcus; laterad of median ridge with a pair of large subrectangular plates with irregular longitudinal callosities, lateral margins granulate, similar to those of mesonotum.

Abdomen. Mtg I and II completely fused, depressed at middle, there with a median thin longitudinal ridge laterally separated by broad deep furrows from wide oblique lateral plates, sloping posteriorly and sideways, further laterad with a pair of large subtriangular depressions; tergal plate subpentagonal, posterior margin truncate, lateral margins slightly rounded; with a slightly raised median thin ridge on mtg III, a pentagonal elevation on mtg IV then tapering posteriorly; laterad of median ridge with the usual pattern of large and small callous spots and smooth surface; deltg II+III completely fused, deltg IV–VII separated by fine sulci; posterolateral angles of deltg VII slightly protruding, blunt; ptg VIII clavate, not reaching to posteror margin of deltg VII; pygophore short and rounded ( Figs. 30–31 ); parameres slender ( Figs. 32–34 ).

Venter. Sterna III to VI raised along posterior margin, depressed along anterior border with triangular, smooth spots medially, flanked by a pair of large, transversely ovate shallow depressions and a pair of round callous spots of usual pattern; spiracles II to IV ventral, IV only faintly visible from above, V to VII lateral, placed on dorsally reflexed rim of vltg V–VII and visible from above, VIII terminal; vltg VII with shiny large strong oblique callus.

Legs. Slender, preapical comb on fore tibia present, claws with fine pulvilli.

Female. Morphological structures as of male but of larger size. Head longer than wide across eyes (1.09: 0.92); length of antennal segments I to IV= 0.65: 0.34: 0.58: 0.34; pronotum wider than long (1.67: 0.54); width of mesonotum 2.18; width of metanotum 2.55; mtg VII slightly elevated posteriorly; posterolateral angles of deltg VII blunt, ptg VIII lobiform, shorter than tergite IX.; spiracles II to IV ventral, IV only faintly visible from above, V to VII lateral and visible from above, VIII terminal.

Measurements (in mm, ♂♂ (n=9) / ♀♀ (n=2), holotype in parentheses). Body length 4.32–4.85 / 5.5–5.65 (4.56); maximal width of abdomen 2.11–2.48 / 2.80–3.10 (2.28). Head length 0.82–0.92 / 1.02–1.09 (0.92), width 0.75–0.78 / 0.88–0.92 (0.78). Pronotum length 0.48–0.54 / 0.54–0.54 (0.51), width 1.26–1.46 / 1.67–1.67 (1.36). Mesonotum width 1.53–1.84 / 2.04–2.18 (1.67). Metanotum width 1.77–2.14 / 2.35–2.55 (1.94). Length of antennal segments I–IV = 0.54–0.65, 0.34–0.34, 0.51–0.58, 0.34–0.34 / 0.65–0.75, 0.34–0.37, 0.58–0.61, 0.34–0.37 (0.61, 0.34, 0.58, 0.34).

Etymology. The specific name refers to the oblique pronotal margins; it is derived from the Latin adjective obliquus (inclined, slanting) and the latinized Greek noun notum (dorsal part of body); noun in apposition.

Distribution. China (Hainan).

Figures

FIGURES 18–21. Rotundocoris obliquonotum sp. nov. 18–19, holotype male; 20–21, female; 18, 20, dorsal view; 19, 21, ventral view. Scale bars = 1 mm.

FIGURES 22–34. Rotundocoris obliquonotum sp. nov. 22–29, different body parts; 30–31, pygophore in dorsal and lateral view; 32–34, right paramere; 22, 23, 26, 27, holotype male; 24, 25, 28, 29, paratype female; 22, 24, 26, 28, dorsal view; 23, 25, 27, 29 ventral view. Scale bars = 0.5 mm for 22–31; 0.1 mm for 32–34.