Rotundocoris stenonotum 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 : 527-530

Rotundocoris stenonotum Bai & Heiss , sp. nov.

( Figs. 1–17 )

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 ♂♂ 3 ♀♀, IMNU, CEHI) ; China, Hainan, Baisha, Yinggeling , 950 m, 2.viii.2007, leg. X. S. Bai (1 ♂ 3 ♀♀, IMNU, CEHI) ; China, Hainan, Bawang, Dongerlinchang , 14.x.2007, leg. W. J. Zhang (1 ♂, IMNU) ; provided with type labels accordingly.

Description of male. Head. Slightly longer than wide across eyes (0.91: 0.78); genae notched anteriorly, reaching basal third of first antennal segment; clypeus strongly raised anteriorly, with tubercle near apex; antenniferous tubercles short, dilated, apices acute; antennae 2.13 times as long as width of head across eyes, length of antennal segments I to IV= 0.58: 0.37: 0.41: 0.31; eyes small, convex; postocular tubercles small, 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. 2.53 times as wide as long (1.29: 0.51), attenuated anteriorly; collar narrow; anterolateral angles produced and forming blunt lobes, reaching to anterior margin of collar; disc with a longitudinal median furrow, flanked by a pair of subtriangular sclerites and laterad with a pair of subrectangular plates with irregular callosities and granulate carinae; posterior margin of pronotum slightly convex, separated from mesonotum by a deep furrow.

Mesonotum. Wider than pronotum (1.6: 1.29); separated laterally from metanotum by very deep furrows, medially across meso- and metanota with an elongate, subpentagonal bottle-shaped ridge, 1.83 times as long as wide (0.75: 0.41), subrounded anteriorly and truncate posteriorly, smooth and without 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 (1.87: 1.6); separated from fused mtg I+II by a slightly sinuate thin sulcus; laterad of median ridge with a pair of large subrectangular plates with irregular longitudinal callosities, lateral margins granulate like those of mesonotum.

Abdomen. Mtg I and II completely fused, depressed at middle, there with a median thin longitudinal ridge laterally separated by 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, median ridge slightly raised 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; deltg II+III completely fused, deltg IV–VII separated by fine sulci; posterolateral angles of deltg VII slightly protruding, blunt; ptg VIII clavate, reaching to posterior margin of deltg VII; pygophore short and posteriorly rounded ( Figs. 13–14 ); parameres slender ( Figs. 15–17 ).

Venter. Sterna III–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 ventral, III to IV sublateral and only partly faintly visible from above, V–VII lateral, placed on dorsally reflexed rim of vltg V–VII and visible from above, VIII terminal; vltg VII with shiny large 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 (0.99: 0.82); length of antennal segments I to IV= 0.61: 0.37: 0.41: 0.31; pronotum wider than long (1.42: 0.54); width of mesonotum 1.84; width of metanotum 2.14; mtg VII slightly elevated posteriorly; posterolateral angles of deltg VII blunt, ptg VIII lobiform, shorter than tergite IX; spiracles II ventral, III to IV sublateral and only IV faintly visible from above, V to VII lateral and visible from above as in male, VIII terminal.

Measurements (in mm, ♂ ♂ (n=3) / ♀♀ (n=4), holotype in parentheses). Body length 4.35–4.69 / 5.00–5.05 (4.69); maximal width of abdomen 2.18–2.18 / 2.62–2.65 (2.18). Head length 0.82–0.91 / 0.99–0.99 (0.91), width 0.75–0.78 / 0.82–0.82 (0.78). Pronotum length 0.51–0.51 / 0.54–0.54 (0.51), width 1.29–1.29 / 1.42–1.43 (1.29). Mesonotum width 1.60–1.60 / 1.84–1.87 (1.6). Metanotum width 1.87–1.90 / 2.14–2.14 (1.87). Length of antennal segments I–IV =0.54–0.58, 0.34–0.37, 0.41–0.41, 0.31–0.31 / 0.61–0.61, 0.37–0.37, 0.41–0.41, 0.31–0.31 (0.58, 0.37, 0.41, 0.31).

Etymology. The specific name refers to the attenuated pronotum; it is formed from the Greek adjective stenos (narrow) and the latinized Greek noun notum (dorsal part of body); noun in apposition.

Distribution. China (Hainan).

Figures

FIGURES 1–4. Rotundocoris stenonotum sp. nov. 1–2, holotype male; 3–4, paratype female. 1, 3, dorsal view; 2, 4, ventral view. Scale bar = 1 mm.

FIGURES 5–17. Rotundocoris stenonotum sp. nov. 5–12, different body parts; 13–14, pygophore in dorsal and lateral views; 15–17, right paramere. 5, 6, 9, 10, holotype male; 7, 8, 11, 12, paratype female; 5, 7, 9, 11, dorsal view; 6, 8, 10, 12, ventral view. Scale bars = 0.5 mm for 5–14; 0.1 mm for 15–17.