Crassocoris hsiaoi Bai, Heiss & Cai, 2007

Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2018, Reconsideration of the apterous carventine genus Crassocoris and description of Paracrassocoris gen. nov. from China (Hemiptera: Heteroptera: Aradidae), Zootaxa 4455 (3), pp. 537-546: 538-542

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Crassocoris hsiaoi Bai, Heiss & Cai, 2007


Crassocoris hsiaoi Bai, Heiss & Cai, 2007 

( Figs. 1–17)

Type material. Holotype (♀): China, Hainan, Baisha, Yinggeling , 1050 m, 10.ix.2005, leg. L.S. Chen ( IMNU). 

Other material examined. (♂) China, Hainan, Baisha, Yinggeling , 1200 m, 23.x.2007, leg. W.J. Zhang  ; (♂) China, Hainan, Jianfengling, Nanya , 644 m, 22.viii.2007, leg. X.S. Bai  ; (♀) China, Hainan, Baisha, Yinggeling , 1200 m, 23.x.2007, leg. W.J. Zhang  ; (2♀♀) China, Hainan, Jianfengling, Tianchi , 810 m, 16.viii.2007, leg. Bai & Zhang ( IMNU, CEHI); (♂) Baisha, Yinggeling, 950 m, 2.viii.2007, leg. X.S. Bai ( CEHI). 

Redescription of female holotype. Head. Longer than wide across eyes (1.27/1.0); genae slightly notched anteriorly, nearly reaching basal half of first antennal segment; clypeus strongly raised anteriorly, with tubercle near apex; antenniferous tubercles short, dilated, apices acute; antennae 2.4 times as long as width of head across eyes, length of antennal segments I to IV= 0.77/0.37/0.83/0.43; eyes small, convex; postocular tubercles small and not reaching outer margin of eyes, postocular borders constricted posteriorly; vertex with Y-shaped granulate carinae flanked by a pair of large, ovate infraocular callosities; rostrum short, rostral groove narrow, deep, closed posteriorly.

Pronotum. 2.61 times as wide as long (1.57/0.6), subrectangular; collar narrow; anterolateral angles not produced; disc with median sulcus, flanked by a pair of subtriangular plates which meet at anterior margin; laterad of plates disc with a pair of oval structures, conical tubercles and granulate carinae; posterior margin of pronotum slightly convex, separated from mesonotum by a deep furrow.

Mesonotum. Wider than pronotum (2.17/1.57); separated from metanotum by a pair of very deep furrows laterally; across meso- and metanotum extends medially an elongate ridge with a longitudinal sulcus, constricted at the level of fusion line of meso-metanotum; laterad of median ridge disc with oval longitudinally carinate sclerites; posterolateral angles lobulately produced.

Metanotum and mtg I+II. Wider than mesonotum (2.73/2.23); median ridge flanked by a pair of deep oval depressions, laterad of depressions with two pairs of longitudinal sclerites, further laterad with high granulate carinae; posterolateral angles rounded; mtg I with a pair of high transverse ridges, separated medially by a posteriorly, on mtg II widening deep depression with an inverted Y-shaped carina; laterad of ridges with a pair of triangular deep depressions; mtg II wide, sloping posteriorly and sideways, posterior margins carinate.

Abdomen. Tergal plate consisting of mtg III–VI; anterior margin slightly produced medially, posterior margin straight, lateral borders slightly rounded; median elevation narrow and constricted on mtg III, strongly elevated on mtg IV, tapering posteriorly to mtg V–VI; dorsal scent gland openings discernible; surface 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, the posterolateral angles formed by the dorsally reflexed vltg II–VII progressively protruding and bearing visible spiracles V–VII; ptg VIII clavate reaching basal four-fifth of segment IX.

Venter. Pro-, meso- and metasternum fused and flattened medially with a pit-like round impression, sterna III to VI raised along posterior margin, depressed along anterior margin, with triangular smooth spots medially, flanked by a pair of large, transversely ovate shallow depressions, these bearing a pair of round callous spots; more laterad two pairs of smaller round callous spots; spiracles II to IV ventral, V to VII lateral and visible from above, VIII terminal.

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

Male. Morphological features as of female, but of smaller size; head longer than width across eyes (1.07/0.87); length of antennal segments I to IV= 0.73/0.33/0.8/0.37; pronotum wider than long (1.33/0.5); width of mesonotum 1.8; width of metanotum 2.26; mtg VII strongly elevated posteriorly; posterolateral angles of deltg VII triangularly produced, vltg VII laterally with a glabrous round tubercle between spiracle VII and suture deltg VI–VII which is visible from above; ptg VIII clavate, shorter than cordate posteriorly elongated pygophore ( Figs. 13, 14 View Figure ).

Measurements [in mm, ♂ (n=2) / ♀ (n=3), holotype in parentheses]. Body length 5.4–5.55 / 5.65–6.0 (6.8); maximal width of abdomen 2.5–2.55 / 2.9–3.0 (3.4). Head length 1.1–1.15 / 1.1–1.15 (1.27), width 0.85–0.9 / 0.9–0.95 (1.0). Pronotum length 0.5–0.55 / 0.5–0.55 (0.65), width 1.3–1.45 / 1.35–1.55 (1.57). Mesonotum width 1.8–1.85 / 1.9–2.05 (2.17). Metanotum width 2.25–2.3 / 2.4–2.6 (2.73). Length of antennal segments I–IV =0.7–0.75, 0.3–0.35, 0.8, 0.35–0.4 / 0.7, 0.3, 0.75, 0.35 (0.77, 0.37, 0.83, 0.43).

Distribution. China (Hainan Island).