Sixteen issid planthopper species in one day in Dong Son-Ky Thuong Nature Reserve in North Vietnam: Eight new species, one new genus and additional new records (Hemiptera: Fulgoromorpha: Issidae) Author Constant, Jérôme 6E6072A1-9415-4C8D-8E60-2504444DB290 Royal Belgian Institute of Natural Sciences, O. D. Phylogeny and Taxonomy, Entomology, Vautier street 29, B- 1000 Brussels, Belgium. jerome.constant@naturalsciences.be Author Pham, Hong Thai E34CB863-7E3B-4E8F-8738-B41C07D9F5F9 Mientrung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Hanoi, Vietnam. & Graduate School of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam. jerome.constant@naturalsciences.be text European Journal of Taxonomy 2024 2024-01-24 919 1 1 87 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2407/10617 journal article 10.5852/ejt.2024.919.2407 2118-9773 10559520 72B7907F-F901-4DDD-B2DD-63D03253837E Longieusarima lunulia Wang, Bourgoin & Zhang, 2017 Figs 1 , 2B , 31–32 Diagnosis Longieusarima lunulia is the only species in the genus. Material examined VIETNAM • 3 ♂♂ (dissected – Figs 31–32 ), 1 ♀ ; Quang Ninh Province , Dong Son-Ky Thuong Nature Reserve ; 21°08′29″ N , 107°04′53″ E ; 27 Aug. 2022 ; 550 m a.s.l. ; secondary forest; GTI Project ; J. Constant , J. Bresseel and L. Semeraro leg.; I.G.: 34.518; RBINS • 1 ♂ (dissected), 1 ♀ ; same collection data as for preceding; VNMN . Supplementary description MEASUREMENTS AND RATIOS . LT: ♂ (n = 4): 6.4 mm (6.3–6.6), ♀ (n = 2): 7.1 (7.0–7.2); LT/BB = 2.36; LTg/BTg = 2.54; LW/BW = 1.37; BV/LV = 1.20; LF/BF = 0.92. HEAD ( Fig. 31A–D ). Vertex 1.2 times as broad as long in midline, brown often with paler obsolete fine median groove; anterior margin convex, posterior one angularly concave and lateral subparallel; all margins weakly carinate; disc more or less flat. Side of head yellowish brown. Frons slightly wider than long in midline, brown with dorsal angles darker; yellowish curved transverse narrow line in middle of disc; widest under level of antennae and slightly convex; upper margin weakly convex; median carina well marked in dorsal portion then getting weaker ventrad and disappearing at about ventral ⅓; laterodorsal carinae from middle of dorsal margin obliquely to about middle of eye but not reaching lateral margin; lateral and dorsal margins weakly carinate; frontoclypeal suture moderately rounded. Clypeus brown, subtriangular, without carina. Labium brown with last segment longer than broad, and shorter than penultimate. Antennae with scape short, ring-shaped, brown; pedicel bulbous, brown. THORAX ( Fig. 31A, C–D ). Brown. Pronotum in midline 0.6 times as long as mesonotum in midline; paler median line with impressed point on each side, in middle; anterior margin carinate, angularly projecting cephalad, posterior margin straight, weakly incurved in middle; lateral fields very narrow; paranotal lobes paler behind antennae and with transverse black marking along ventral margin. Mesonotum subtriangular with median paler line and longitudinal blunt carina on each side; shallowly depressed at base of scutellum. Tegulae brown. TEGMINA ( Fig. 31A–C ). Brown with pale yellowish transverse veinlets and irregular spots; strong lateral hump in basal ⅓ at level of ScP+R vein, hiding costal margin in dorsal view; longitudinal veins raised; hypocostal plate well developed; about 1.9 times as long as wide when taken together in dorsal view; clavus very elongate, closed. Venation: ScP+R dividing close to base; ScP+RA curved, rather short, disappearing before middle of costal margin; RP very long, weakly curved, nearly reaching to outer margin of tegmen; MP vein first fork slightly before half length; MP 1+2 forked at about apical 1/5, MP 3 simple, reaching apical margin; CuA vein first fork at about midlength of tegmen, posterior to MP first fork; veins Pcu and A1 fused near midlength of tegmen, Pcu+A1 reaching apex of clavus. HIND WINGS ( Fig. 31E ) Brown, darker along apical and posterior margins; veins generally darker than background; well developed, with 3 distinct lobes ( Sarimini type ) more or less equal in width; indentation between ScP-R-MP-Cu and Pcu-A1 lobes moderately deep. Venation: ScP+R and CuA furcate, MP simple; second branch of CuA fused with CuP distally; Pcu and A1 fused on basal half, Pcu and A2 simple; one transverse vein between second branch of ScP+R and MP and between MP and first branch of CuA; A2 not forked. LEGS ( Fig. 31A–D ). Slender and moderately long, yellowish brown with the following dark brown: apex of metafemora and base of metatibiae, and apex of spines of metatibiae and metatarsi. Metatibiae with 2 lateral spines on distal ½ and 7 apical spines; first metatarsus with row of 6 minute teeth along posteroventral margin, limited with a larger tooth on each side. Metatibiotarsal formula: (2) 7 / 8 / 2. MALE TERMINALIA . Pygofer ( Py – Fig. 32A–C ) massive, 2.0 times as high as long at maximum length in lateral view; in lateral view, anterior margin weakly concave, posterior margin with ventral ⅔ portion strongly projecting caudad in a round lobe, dorsal ⅓ portion strongly sinuate and tapering to dorsal digitiform process directed caudad; in caudal view, 1.25 times as high as wide. Gonostyli ( G – Fig. 32AB ) (in lateral view) concave, subtriangular, about 1.1 times as high as long (including capitulum), with moderately developed, rounded, posterior lobe; capitulum ( ca ) with wide, undefined neck, with anteapical lateral obliquely flattened process hooked lateroventrad (in caudal view) and anteroposteriorly flattened, rather strongly curved anterodorsad, with external angle rounded and inner angle straight in caudal view. Aedeagus ( Fig. 32D–I ) symmetrical, moderately curved dorsad (in lateral view); pair of slender, very elongate lateroventral processes ( lvp ) derived from apical 1/9, directed ventrocephalad, evenly curved in lateral view, subparallel, weakly undulate with apex curved laterad and reaching nearly to base of periandrium, in ventral view; dorsal lobe of periandrium ( dl ) with moderately developed apical triangular process directed mesocephalad. Anal tube ( An – Fig. 32A–C ) curved basally then generally straight, elongate in lateral view; strongly convex basally, then more or less dorsoventrally flattened behind anal opening (in basal ⅓), about 2.6 times as long in midline, as wide in dorsal view, suboval with maximum width at anal opening and with apical margin rounded. Fig. 31. Longieusarima lunulia Wang, Bourgoin & Zhang, 2017 , dissected ♂ (RBINS). A . Habitus, dorsal view. B . Habitus, ventral view. C . Habitus, lateral view. D . Habitus, perpendicular view of frons. E . Right hind wing. Fig. 32. Longieusarima lunulia Wang, Bourgoin & Zhang, 2017 , ♂ (RBINS), terminalia. A–C . Pygofer, anal tube and gonostylus. A . Lateral view. B . Caudal view. C . Dorsal view. D–I .Aedeagus and connective. D . Left lateral view. E . Left ventrolateral view. F . Ventrocaudal view. G . Ventral view. H . Dorsal view. I . Anterodorsal view.Abbreviations: see Material and methods. Note on intraspecific variation Some differences were observed between the Vietnamese specimens and those from China as described and illustrated by Wang et al . (2017) : the ratio of the vertex as long as wide in midline in the latter ( Wang et al . 2017 : fig. 29 – 1.2 times in Vietnamese specimens), the tegmina 2.8 times as long as wide ( Wang et al . 2017 : fig. 31 – 2.5 times in Vietnamese specimens) as well as the triangular shape of the gonostyli with apparently less developed posterior lobe and weakly curved apex of capitulum ( Wang et al . 2017 : fig. 35 – posterior lobe moderately developed and apex of capitulum more distinctly curved in Vietnamese specimens). The characters of the male terminalia were regarded too similar to justify the description of a new species for the Vietnamese population; however, we provide a full supplementary description for these specimens. The genus seems to be rather widely spread at least in the northern half of Vietnam (Constant & Pham unpubl. data) and molecular data will surely help to understand how the different populations / species articulate. Biology Longieusarima lineolata sp. nov. was collected in August, on lower vegetation and bushes ( Fig. 2B ), in moist evergreen tropical forest at about 550 m in altitude ( Fig. 1B ) in Dong Son-Ky Thuong Nature Reserve. Distribution Vietnam : Quang Ninh Province , Dong Son-Ky Thuong Nature Reserve ( Fig. 1A ).