Rotundocoris pyramidalis Bai & Heiss, 2020

Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2020, A new apterous genus of Carventinae from Hainan, China (Hemiptera: Heteroptera: Aradidae), Zootaxa 4885 (2), pp. 235-248 : 240-241

Rotundocoris pyramidalis Bai & Heiss , sp. nov.

( Figs. 16–30 )

Type material. Holotype (³): China, Hainan, Baisha, Yinggeling , 950 m, 5.i.2010, leg. X. S. Bai ( IMNU) . Paratypes: China, Hainan, Baisha, Yinggeling , 950 m, 5.i.2010, leg. X. S. Bai (1 ♀, IMNU) ; same but 21.vii.2009 (1 ³, IMNU) ; Tongzha, Wuzhishan , 6.v.2009, leg. Zhang & Yang (1 ³, IMNU) . These specimens are provided with type labels accordingly.

Diagnosis. Rotundocoris pyramidalis sp. nov. resembles R. stenonotum Bai, Heiss & Cai, 2019 and R. obliquonotum Bai, Heiss & Cai, 2019 , both from Hainan, sharing general habitus, but is distinguished from them by a set of morphological features: the presence of a median longitudinal pentagonal-shaped smooth pyramidal ridge along meso- and metanota; male vltg VII being provided with a large triangular callus (vs. median longitudinal sclerite bottle-shaped along meso- and metanotum in R. stenonotum and subpentagonal bottle-shaped ridge with a longitudinal sulcus in R. obliquonotum ; male vltg VII with large oblique callose ridges in both species.)

Description of male. Head slightly longer than wide across eyes (1.0: 0.9); genae anteriorly produced over clypeus and notched, clypeus strongly raised anteriorly, with tubercle near apex; antenniferous tubercles short, dilated, apices acute; antennae 1.78 times as long as width of head across eyes, first segment stout and clavate, longest, second cylindrical, shortest, third longer than fourth and cylindrical, fourth fusiform, longer or as long as second, length of antennal segments I to IV = 0.5: 0.3: 0.45: 0.35; eyes small, convex; postocular tubercles small, not reaching outer margin of eyes, postocular lobes strongly constricted posteriorly; vertex with irregular carinae flanked by a pair of large, ovate infraocular callosities. rostrum arising from a slit-like atrium not reaching limits of rostral groove.

Pronotum 3.22 times as wide as long (1.45: 0.45), 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 (1.75: 1.45); separated laterally from metanotum by very deep furrows, medially across meso- and metanota with an elongate, pentagonal pyramidal ridge, pointed anteriorly and truncate posteriorly, smooth; laterad of median ridge with a pair of subrectangular plates with irregular callosities and granulate carinae along lateral margin.

Metanotum. Wider than mesonotum (2.05: 1.75); 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 long and narrow oblique depressions; tergal plate subrectangular, 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 faint 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, triangular; ptg VIII clavate, reaching to posterior margin of deltg VII; pygophore short cordate and posteriorly rounded ( Figs. 26–27 ); parameres slender ( Figs. 28–30 ).

Venter. Prosternum raised with longitudinal elevations at middle, anteriorly granulate; meso- and metasterna fused, flattened medially; 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 ventral, III to IV sublateral and only partly 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 a large triangular callus.

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

Female. Morphological structures as of male but of larger size; mtg VII slightly elevated posteriorly; posterolateral angles of deltg VII triangular, ptg VIII lobiform, reaching to end of tergite IX; spiracles II ventral, III to IV sublateral and only IV partly visible from above, V to VII lateral and visible from above as in male, VIII terminal.

Measurements [in mm, ³ (n=3), followed by ♀ (n=1), holotype in parentheses]. Body length 4.90–5.25 / 5.75 (4.90); maximal width of abdomen 2.40–2.70 / 3.00 (2.40); head length 1.00 / 1.10 (1.00), width 0.90 / 0.95 (0.90); pronotum length 0.45–0.50 / 0.50 (0.45), width 1.45–1.70 / 1.75 (1.45); mesonotum width 1.75–2.00 / 2.10 (1.75); metanotum width 2.05–2.30 / 2.40 (2.05); length of antennal segments I–IV = 0.50–0.55: 0.30: 0.40–0.45: 0.300.35 / 0.65: 0.325: missing (0.50: 0.30: 0.45: 0.35) and 0.65: 0.325: missing.

Etymology: The specific name is the Latin adjective pyramidalis , -, - e, meaning “pyramidal”, “pyramidshaped”, referring to the structure of the median pentagonal ridge along meso- and metanotum.

Distribution: China (Hainan).

Figures

FIGURES 16–19. Rotundocoris pyramidalis sp. nov. 16–17, holotype male; 18–19, paratype female. 16, 18, dorsal view; 17, 19, ventral view. Scale bar = 1 mm.

FIGURES 20–30. Rotundocoris pyramidalis sp. nov. 20–25, different body parts; 26–27, pygophore in dorsal and lateral views; 28–30, right paramere. 20, 21, 24, 25, holotype male; 22, 23, paratype female; 20, 22, 24, 26, dorsal view; 21, 23, 25, ventral view. Scale bars = 0.5 mm for 20–27; 0.1 mm for 28–30.