Libiocoris sinensis Bai, Yang & Cai

Bai, Xiaoshuan, Yang, Chunwang & Cai, Wanzhi, 2006, First record of the genus Libiocoris Kormilev 1957 (Heteroptera: Aradidae) from China, with the description of two new species, Zootaxa 1370, pp. 39-47 : 43-44

2. Libiocoris sinensis Bai, Yang & Cai sp. nov.

( Figs. 2 , 8–12 )

Diagnosis: This species is most similar to L. heissi Bai, Yang & Cai sp. nov. But it may be recognized by postocular borders without tubercles and with shallow sulcus on medial plate of meso- and metanota ( Figs. 2 , 6, 10 ) (vs. postocular borders with tubercles and without shallow sulcus on medial plate of meso- and metanota in L. heissi Bai, Yang & Cai sp. nov.).

Description of female. Color: Body reddish brown to blackish brown, incrustation grayish brown. Eyes reddish.

Structure: Head, thoracic tergites and pleura, most of abdominal tergites, connexiva, lateral sides of third to sixth abdominal sterna covered with incrustation. Antenna and legs covered with erect setae ( Fig. 2 ). Head longer than wide across eyes; genae short, slightly notched anteriorly, reaching basal one-third of first antennal segment; clypeus strongly raised anteriorly, with tubercle near apex. Antenniferous tubercles short, dilated, apices acute, divergent anteriorly. Eyes small, convex laterally. Postocular borders without tubercles, nearly straight and converging. Vertex with irregular granulate carinae; infraocular callosities large, ovate, separated from median carinae by deep sulci; posterior margin of vetex with a U-shaped carina. Antenna 2.12 times as long as head width across eyes; first segment stout, clavate; second and third cylindrical, third pendunculate at base; fourth fusiform with pilose at apex ( Fig. 10 ). Rostrum short, rostral groove broad, deep, closed posteriorly ( Fig. 9 ). Pronotum 2.5 times as wide as long; collar narrow; anterolateral angles produced forward beyond collar as 2 (1+1) large, blunt lobes; disc with narrow median sulcus, flanked by 2 (1+1) small callosities, and further laterad 2 (1+1) short carinae and irregular small callous spots, lateral border granulate; posterior margin of pronotum slightly produced posteriorly, separated from mesonotum by deep furrow. Mesonotum wider than pronotum; separated from metanotum by 2 (1+1) thin sulci laterally; across meso- and metanota medially with elongate, rhomboid plate, subrounded anteriorly and truncate posteriorly, with sulci; laterad of median plate disc with 6 (3+3) longitudinal ridges, lateral border densely granulate. Metanotum wider than mesonotum; separated from tergum I by slightly sinuate thin sulcus; laterad of median plate with 4 (2+2) large, ovate ridges; lateral border granulate, similar to those on mesonotum. Legs long and slender, without spines, preapical comb on fore tibia present, femur subcylindrical, claws with fine pulvilli ( Fig. 11 ). Tergum I fused with tergum II, disc with 2 (1+1) tubercles separated medially by wide, deep depression; tergum II wide, sloping posteriorly and sideways, forming 2 (1+1) large, ovate plates flanking median depression. Central dorsal plate subrectangular, consisting of terga III to VI; moderately carina raised medially on tergum III, pentagonal elevation on terga IV and V, tapering ridge on tergum VI; laterad of median ridge with a usual pattern of large and small callous spots. Connexiva strongly reflected; deltg II and III separated by thin carina; posteroexterior angles of deltg II to VII progressively protruding; paratergites clavate; terminal part of abdomen as in Figs. 1 , 12 . Abdominal spiracle II ventral, III–VII lateral and visible from above, VIII terminal. Prosternum raised medially and with thin sulcus on elevation medially; meso- and metanota and sternum II flattened medially, without sulci. Sterna III to VI raised along posterior border, depressed along fore border, and with triangular, smooth spots medially, flanked by 2 (1+1) large, transversely ovate depressions, these bearing 2 (1+1) round callous spots; more laterad 4 (2+2) smaller round callous spots.

Measurements [in mm, Ψ (n=1)]. Body length 5.0; maximal width of abdomen 2.6. Length head (including neck) 0.98, width 0.83. Length pronotum 0.52, width 1.3. Width mesonotum 1.70; width metanotum 2.03. Length antennal segments I–IV = 0.62, 0.26, 0.57, 0.31.

Type material: Holotype: Ψ, China, Hainan, Jianfengling, 21.VII. 2004, J. Wu & Y. J. Chen leg. ( CAU).

Etymology: This specific name is based on the holotype locality.

Distribution: China (Hainan).

Figures

FIGURE 1. Libiocoris heissi sp. nov. Ψ, holotype. Habitus. Scale bar = 0.695 mm.

FIGURE 2. Libiocoris sinensis sp. nov. Ψ, holotype. Habitus. Scale bar = 0.625 mm.

FIGURES 3 – 12. 3 – 7, Libiocoris heissi sp. nov.; 8 – 12, Libiocoris sinensis sp. nov. 3, 4, 8, 9, Head, antennae partly removed; 5, 10, right antenna; 6, 11, apex of right fore tibia with comb and tarsus; 7, 12, abdominal segments V – VIII. 5, 10, dorsal view; 3, 6, 8, 11, lateral view; 4, 7, 9, 12, ventral view. Scale bar of 3 – 5, 7 – 10, 12 = 0.5 mm; of 6, 11 = 0.25 mm.