Paralibiocoris roundangulus, Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2018

Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2018, The Oriental flat bug genus Libiocoris Kormilev, 1957 revisited: re-examination, synonymy, and description of a new genus (Heteroptera, Aradidae), ZooKeys 789, pp. 115-137 : 119-123

Paralibiocoris roundangulus sp. n. Figs 18-21, 22-30, 31-38

Type material.

Holotype: ♂, China, Hainan, Jianfeng, Tianchi, 810 m, 16.VIII.2007, Zhang & Bai (EMIH). Paratypes. 2♂, China, Hainan, Jianfeng, Tianchi, 810 m, 16.VIII.2007, Zhang & Bai; ♂, China, Hainan, Tongzha, Wuzhishan, 6.V.2009, Zhang & Yang; 2♀, China, Hainan, Jianfeng, Beiganxian, 820 m, 9.VIII.2007, Bai, X. S. (EMIH); 3♂, 3♀ collected with holotype (CEHI ex CAU).

Diagnosis.

General aspect similar to Paralibiocoris heissi , but distinguished from it by a wider pronotum, 2.86 times as wide as long (2.80 in P. heissi ), anterolateral lobes widely rounded (narrow and more produced), shorter antennae 1.79 times as long as width of head (2.1). Paralibiocoris roundangulus sp. n. differs from P. hainanensis sp. n. and P. limuensis sp. n. by a different shape of the median ridge of meso- and metanotum (Figs 22, 24) and shorter antennae which are 1.79 times as long as width of head (1.89 and 1.82 respectively).

Description.

Male. Basic morphological structures as of P. heissi . Head. As long as wide across eyes (0.82/0.82); antennae 1.79 times as long as width of head across eyes, length of antennal segments I to IV = 0.48, 0.24, 0.44, 0.31.

Pronotum. 2.86 times as wide as long (1.23/0.43); collar narrow; anterolateral angles produced forward beyond collar as two (1+1) widely rounded granulate lobes; disc with a longitudinal median furrow flanked by 2 (1+1) large, subtriangular and smaller callosities; lateral margin granulate.

Mesonotum. Wider than pronotum (1.60/1.23); separated from metanotum by two (1+1) deep furrows laterally; across meso- and metanota medially with an elongate, smooth bottle-shaped plate similar to P. heissi , 1.56 times as long as wide (0.67/0.43).

Metanotum. Wider than mesonotum (1.83/1.60); separated from mtg I by a slightly sinuate thin sulcus.

Abdomen. Mtg I and II completely fused, disc with a wide, smooth rectangular plate at middle flanked by two (1+1) large oblique plates, sloping posteriorly and sideways, laterally with two (1+1) small subtriangular depressions; deltg II and III fused, the following separated by fine sulci; posterolateral angles of deltg V to VII progressively angularly protruding; paratergites clavate, short, not reaching beyond posterolateral angles of deltg VII; pygophore elongate cordate, surface rugose (Figs 34, 35); parameres slender (Figs 36-38).

Venter. Sterna III to VI raised along posterior border, depressed along anterior border, and with triangular, smooth spots medially, flanked by 2 (1+1) shallow, transversely ovate depressions, these bearing 2 (1+1) round callous spots; 4 (2+2) smaller round callous spots present laterally; vltg VII with a small callus near spiracle VII; spiracles II ventral, III–VIII lateral and visible from above.

Female. Morphological features similar to male but of larger size; head slightly longer than wide across eyes (0.93/0.87); length of antennal segments I to IV = 0.48, 0.24, 0.44, 0.31; pronotum wider than long (1.47/0.43); width of mesonotum 1.90; width of metanotum 2.16, anterior lobe of median plate across meso- and metanota truncate, 1.2 times as long as wide (0.78/0.65); mtg VII moderately elevated posteriorly, the posterolateral angles forming triangular lobes; ptg VIII lobiform, reaching basal half of segment IX.

Measurements.

[in mm, ♂(n = 4)/♀ (n = 2), holotype in parentheses]. Body length 4.1-4.15/4.9-5.1 (4.1); maximal width of abdomen 2.05-2.1/2.55-2.75 (2.1). Head length 0.82/0.9-0.93 (0.82), width 0.82/0.8-0.87 (0.82). Pronotum length 0.43/0.43 (0.43), width 1.23/1.4-1.47 (1.23). Mesonotum width 1.55-1.6/1.85-1.90 (1.60). Metanotum width 1.83-1.9/2.1-2.16 (1.83). Length of antennal segments I–IV = 0.48, 0.24, 0.44, 0.31/0.48, 0.24, 0.44, 0.31 (0.48, 0.24, 0.44, 0.31).

Etymology.

The name of species refers to the widely rounded anterolateral angles of pronotum.

Distribution.

China (Hainan).