Isyndus reticulatus Stål, 1868

Zhao, Yisheng, Song, Fan, Li, Hu & Cai, Wanzhi, 2018, Bionomic notes of Isyndus reticulatus Stål (Hemiptera: Reduviidae), Zoological Systematics 43 (4), pp. 410-419 : 411-413

Isyndus reticulatus Stål, 1868 ( Figs 1–14)

Isyndus heros Stål, 1858 (nec Fabricius): 445.

Isyndus reticulatus Stål, 1868: 101 ; Stål, 1874: 21; Lethierry & Severin, 1896: 187; Hoffmann, 1935: 145; China, 1940: 254; Hoffmann, 1944: 67; Hsiao & Ren, 1981: 495; Maldonado-Capriles, 1990: 221; Cai & Wang, 1998: 171.

Euagoras reticulatus: Walker, 1873: 121 .

Isyndus reticulatus reticulatus: Dispons, 1969: 71 ; Putshkov & Putshkov, 1996: 242.

Coloration. Body dark brown to black. Most of anteocular portion, annulations on first antennal segment, basal half of second antennal segment, apices of third antennal segment, apical portion of fourth antennal segment, markings on pronotum, annulations on legs, markings on corium and connexiva orange to red brown ( Fig. 1).

Structure. Body large, covered by dense, yellowish, short, appressed setae, intermixed with long erect setae. Interocular sulcus broad, ocelli-bearing area of postocular slightly protruding. Anterior pronotal lobe with 1+1 processes bilaterally; posterior lobe with distinct transverse rugosities, humeri ending into an acute spine with an obtuse denticle posteriad of its base. Posterior pronotal angles prominent backwards, posterior margin slightly concave. Scutellum equilaterally triangular, with a strongly impressed “Y”-shaped ridged, its subapical portion ending into a small cone-shaped process ( Fig. 2 ). Hemelytron of female slightly surpassing tip of abdomen, that of male extending distinctly beyond tip of abdomen. Fifth and sixth connexival segments significantly expanded, abdominal sternum with glabrous spots ( Figs 2–3 ). Median process of pygophore prominent, biramous, each ramus faintly subdivided into an outer small process and an inner large one ( Figs 4–5 ). Paramere club-shaped, curved, with long setae ( Figs 6–7 ); apical portion of phallosoma slightly raised ( Fig. 8 ); articulatory apparatus with basal plate and basal plate bridge thin, pedicel short ( Fig. 9 ); dorsal phallothecal sclerite with two small elliptical processes ( Figs 10–11 ); dorsal conjunctiva processes whip-like, bent, apically tapering ( Figs 12–14 ); basal portion of ventral processes concealed beneath dorsal phallothecal sclerite when endosoma is partly uneverted, dorsal and lateral endosoma processes podgy, apically provided with three small processes ( Fig. 13 ).

Measurements (♂ (n = 5)/ ♀ (n = 6)). Body length 18.40–20.10/23.40–25.50; maximum width of abdomen 4.64–5.01/ 7.87–8.97. Length of head 3.56–3.84/3.97–4.26; length of anteocular portion 1.40–1.49/1.70–1.99; length of postocular portion 1.51–1.60/1.64–1.80; length of interocellar space 1.09–1.23/1.27–1.46; length of synthlipsis 0.50–0.57/0.48–0.57; length of antennal segments I–IV= 6.83–8.22/7.94–9.94, 1.50–2.27/2.01–2.61, 5.36–7.84/6.94–7.86, 2.64–3.59/2.57–3.13; length of visible rostral segments I–III=1.73–1.93/1.71–2.37, 1.30–1.40/1.54–1.60, 0.48–0.71/0.71–0.73. Length of anterior pronotal lobe 1.44–2.14/1.76–2.11; length of posterior lobe 2.31–2.70/2.93–3.31; width of pronotum 5.21–5.71/6.84–7.40. Length of hemelytron 12.83–12.95/15.85–16.80.

Material examined. China, Yunnan, Mengla , 3♀ 5♂, 10. V.2009, leg. Hu Li ; China, Guangxi, Nanning , 1♀, 16. V.1982, leg. Fasheng Li ; China, Guangxi, Sanmeng , 1♀, 4. VI.1982, leg. Chi-kun Yang ; China, Guangdong, Shixing , 1♀, 20.IV.1991, leg. Fasheng Li.

Distribution. China (Zhejiang, Jiangxi, Sichuan, Guizhou, Fujian, Guangdong, Guangxi, Yunnan, Hong Kong), India, Sri Lanka, Vietnam, Malaysia and Indonesia.

Notes. This species is a common harpactorine reduviid in southern China and is also broadly distributed in the Oriental Region. Dispons (1969) synonymized I. pilosipes Reuter, 1881 and I. modestus Distant, 1919 with this species, but the validity of Dispons’ opinion is still debated (Cai & Wang, 1998).

Figures

Figures 2–14. Isyndus reticulatus Stål. 2. Body of female, antennae and legs partly removed, lateral view. 3. Abdomen of male, lateral view. 4. Apical part of pygophore, ventral view. 5. Apex of pygophore, lateral view. 6–7. Different views of paramere. 8. Phallus， uneverted condition, lateral view. 9. Phallobase, dorsal view. 10–13. Phallosoma, partly everted condition. 14. Dorsal conjunctiva process, dorsal view. 10, 13. Dorsal view; 11. ventral view; 12. lateral view. Scale bars: 2–3=3.0mm; 4, 6–14=1.0mm; 5=2.0mm.