Pseudocoruncanius nigrifrons Gnezdilov 2022, sp. n.
Creators: name: Gnezdilov, Vladimir M.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Issidae
Pseudocoruncanius
Pseudocoruncanius nigrifrons

description: Pseudocoruncanius nigrifrons sp. n.
(Figs 1–13)
Diagnosis. Metope almost entirely dark brown to black. Anterior margin of coryphe convex. Forewings with light brown costal margin and with transverse white yellowish stripe between M and CuA. Male anal tube slightly narrowing into a wide rounded apex (in dorsal view).
Description. Structure. Metope convex, its upper part visible from above, wide, 1.6 times wider between eyes than long medially, with distinct fine median carina arising from its upper margin but not reaching metopoclypeal suture and weak sublateral carinae fused below its upper margin, strongly curved but not reaching metopoclypeal suture (Figs 2–4). Lateral margins of metope visor-shaped above the pedicels. Coryphe twice as wide as long medially, flat, without carinae, its anterior margin convex and posterior margin obtusely angulately concave (Fig. 2). Metopoclypeal suture weakly convex. Postclypeus large, flattened frontally, without carinae. Antennal pedicel elongate. Ocelli small. Rostrum reaching hind coxae, with 3rd segment nearly equal in length to 2nd segment, distinctly narrowing apically. Pronotum as long as coryphe, with weak median carina, anterior margin strongly convex, posterior margin slightly concave. Paradiscal fields of pronotum narrow, not visible behind the eyes. Mesonotum slightly longer than pronotum, with smooth median carina. Forewings narrowly oval, three times as long as wide medially (in lateral view), slightly tapering to rounded apices, with wide hypocostal plate and distinct knee prominence; basal cell narrowly oval; clavus long, ¾ of wing length (Figs 1, 5). Tegulae small. Forewing vein sequence: R 2, forked basad of knee prominence, R 1 not reaching wing margin; M 3, firstly forked near to wing middle and M 1 forked apically; CuA 2, forked before apex of clavus. Hind wings three-lobed, with coupling lobe and rudimentary membrane; remigio-vannal and anal lobes equal in width, remigial lobe slightly narrower (Fig. 6). Hind wing vein sequence: R 2, forked right after coupling lobe; r-m 1; M 1; m-cua 1; CuA 2, forked in its apical third; CuP 1; Pcu 1; A 1 2; A 2 1. CuA 2 and CuP fused apically with flattening. Pcu and A 1.1 fused medially. Fore and middle femora slightly flattened. Hind tibia with two lateral spines in its distal half and with eight apical spines. First and second metatarsomeres nearly equal in length, first one widest. First metatarsomere with two lateroapical and seven intermediate spines arranged in an arc. Arolium of pretarsus almost straight, nearly reaching claw apices (in dorsal view), dorsolateral plates wide.
Colouration. Metope dark brown to black except for narrow brown area below its upper margin, with yellow traces of larval sensory pits. Post- and anteclypeus dark brown to black. Coryphe light brown. Genae bright yellow. Postocular fields light yellow. Rostrum brown yellowish, with apex of 3rd segment black. Antennae with scapus dark brown; pedicel brownish yellow, with light sensory organs. Pro- and mesonotum brown, with light brown yellowish median line. Pronotum with yellow traces of larval sensory pits on its anterior margin. Paranotal lobes brown to pale yellowish. Tegulae dark brown. Forewings light brown in precostal area to dark brown on main parts of corium and clavus, with a white yellowish stripe running from the basal cell along the claval suture, crossing first median fork and terminating on M 1. Another white yellowish stripe running between M 1 and M 2 and terminating at wing apex, with M 1.1 and M 1.2 almost entirely pale yellowish. Hind wings brown to black on CuA + CuP flattening, longitudinal veins lined with dark brown. Fore and middle coxae, trochanters, and femora dark brown to black. Fore and middle tibiae yellowish, with three dark brown bands – basally, medially and apically. Hind coxae and trochanters yellowish. Hind femora yellowish brown to dark brown. Hind tibiae light yellow, with a wide dark brown band above its basal part. Claws and apices of 3rd tarsomeres dark brown to black. Apices of leg spines black. Abdominal sternites and pygofer dark brown. Plates of styles predominantly light yellow, with dark brown angles.
Male genitalia (Figs 7–13). Pygofer vertically elongate, with convex hind margins (Fig. 11). Anal tube long, 2.5 times as long as wide medially, slightly narrowing to widely rounded apex (in dorsal view) (Fig. 10). Anal tube flat, without processes (in lateral view) (Fig. 11). Anal column (paraproct) short. Genital style with wide plate and concave hind margin, anterior margin strongly convex proximal to the neck of capitulum (Fig. 12, hm, nc). Capitulum wide, not narrowing apically (in dorsal view), on distinct neck, with large lateral tooth (Figs 12, 13, cp, lt). Phallobase rather narrow, slightly curved (in lateral view) (Fig. 7). Ventral phallobase lobe wide basally and distinctly narrowing apically – hastate (Fig. 8, vl). Dorsolateral phallobase lobes each with a long and narrow serrate subapical process directed basally (Figs 7, 9, dll). Phallobase proximally with a peculiar dorsolateral slit-like hole (Figs 7, 9, sh). Aedeagus with a pair of long and narrow ventral hooks arising in its apical part and crossing behind the phallobase within a slit-like hole (Figs 7, 8, vh). Apical aedeagal processus each with a semicircular lobi. Connective with wide cup and long handle (Fig. 7, ch, cnc).
Female. Unknown.
Total length: 6.0 mm.
Type material. Holotype, male, Vietnam, Vinh Phu Province, Tam Dao, 100 km NW Hanoi, 1000 m, forest, 10.XI.1990, S. A. Belokobylskij leg. (ZIN). Paratype: 1 male, same data as holotype (ZIN).
Etymology. The species is named after the black metope.
description: Published as part of Gnezdilov, Vladimir M., 2022, Review Of The Genus Pseudocoruncanius Meng, Qin Et Wang, 2020 (Hemiptera: Fulgoromorpha: Issidae), With The Description Of A New Species From Vietnam, pp. 305-312 in Acta Zoologica Academiae Scientiarum Hungaricae 68 (4) on pages 307-310, DOI: 10.17109/AZH.68.4.305.2022, http://zenodo.org/record/7399519