Eusarima ( Eusarima ) bourgoini, Constant & Pham, 2025

Constant, Jérôme & Pham, Hong Thai, 2025, Issid planthoppers from Bach Ma and Phong Dien in Central Vietnam. (III) Tribe Sarimini (Hemiptera: Fulgoromorpha: Issidae), European Journal of Taxonomy 1025, pp. 1-109 : 69-75

Eusarima ( Eusarima) bourgoini sp. nov.

urn:lsid:zoobank.org:act:

Figs 34–36

Diagnosis

Eusarima ( Eusarima) bourgoini sp. nov. can be recognized by the following combination of characters: (1) the frons yellowish brown, darker towards dorsal margin, with dorsal and lateral margins finely lined in black ( Fig. 34E); (2) the anterodorsal margin of the gonostyli slightly, evenly convex in lateral view ( G – Fig. 35A); (3) the anal tube in dorsal view ( An – Fig. 35C), elongate (about 2.6 × as long as wide), dorsoventrally flattened, slightly widening from base to level of anal opening in basal ⅓, then slightly tapering to a round apical margin; (4) the dorsal lobe of the periandrium more or less parellel-sided in dorsal view ( dl – Fig. 36A), distally forming a rounded lobe with, on each side, a dorsal spinose process ( dsp – Fig. 36C) upcurved and sinuate in caudal view; (5) the lateroventral processes of the aedeagus ( lvp – Fig. 36F–H) extremely elongate and slender, arising in distal 1 /6 and reaching base of aedeagus.

Differential diagnosis

Eusarima ( Eusarima) bourgoini sp. nov. can be separated from both E. ( Eusarima) bachmana sp. nov. and E. ( Eusarima) boevei sp. nov. by the lateroventral processes of the aedeagus, much longer, reaching the base of the aedeagus while they reach at best halflength of the aedeagus in the two other species; it can be additionally separated from E. ( Eusarima) boevei by the lack of a tranverse yellowish band on the frons.

Etymology

The species epithet is a patronym dedicated to Prof. Dr Thierry Bourgoin (Muséum national d’Histoire naturelle, Paris, France) in acknowledgement of his support to the work of the authors over the years.

Type material

Holotype

VIETNAM • ♂; Thừa Thiên-Huế Province, Bach Ma National Park ; 16°11′44″ N, 107°50′44″ E; 1200– 1300 m a.s.l.; 22 May 2023; J. Constant and L. Semeraro leg.; roadside; VNMN.

Paratypes

VIETNAM – Da Nang Province • 1 ♂; Ba Na-Nui Chua Nature Reserve ; 16°00′ N, 108°01′ E; 16–19 Jul. 2017; J. Constant and J. Bresseel leg.; GTI Project; I.G.: 33.498; RBINS. – Thừa Thiên-Huế Province • 1 ♂; same data as for holotype; I.G.: 34.640; RBINS • 3 ♂♂; Bach Ma National Park ; 16°11′18″ N, 107°50′56″ E; 1300–1400 m a.s.l.; 11–21 May 2023; J. Constant and L. Semeraro leg.; summit; I.G.: 34.640; RBINS • 1 ♂; same data as for preceding; VNMN • 3 ♂♂; Bach Ma National Park ; 16°13′38″ N, 107°51′20″ E; 500–600 m a.s.l.; 10–20 May 2023; J. Constant and L. Semeraro leg.; pheasant trail; I.G.: 34.640; RBINS • 3 ♂♂; same data as for preceding; VNMN • 1 ♂; Bach Ma National Park ; 30 May 2023; T.T.H. Nguyen leg.; summit trail; light trap; VNMN • 1 ♂; Bach Ma National Park , road to Bach Ma Peak; 16°11′45.73″ N, 107°51′46.34″ E; 1325 m a.s.l.; May 2023; T.T.H. Nguyen leg.; [by] net; AU00672 VNMN • 1 ♂; same data as for preceding; AU00673 ; VNMN • 1 ♂; Phong Dien District; 16°30′27″ N, 107°16′05″ E; 350–400 m a.s.l.; 23 May 2023; J. Constant and L. Semeraro leg.; I.G.: 34.640; RBINS • 1 ♂; same data as for preceding; VNMN .

Description

MEASUREMENTS AND RATIOS. LT: ♂ (n = 10): 5.4 mm (5.3–5.6); LT/BB = 2.03; LTg/BTg = 2.30; LW/BW = 1.21; BV/LV = 2.01; LF/BF = 0.98.

HEAD ( Fig. 34A–E). Vertex brown, paler in posterior angles, with fine, yellowish, obsolete median carina; 2.0 × as broad as long in midline, slightly constricted in middle; disc weakly concave; anterior margin angularly projecting anteriad (widely obtuse angle); posterior margin rather deeply concave; all margins carinate. Frons yellowish brown, darker towards dorsal margin, with dorsal and lateral margins finely lined in black; weakly convex, smooth with distinct median carina reaching dorsal margin above but not reaching fronto-clypeal suture; peridiscal carina distinct nearly down to fronto-clypeal suture, crossing median carina slightly under dorsal margin; some yellowish tubercles along lateral margins; dorsal margin more or less straight (weakly convex in middle portion); widest at level of antennae. Genae yellow, paler than frons, with anteroventral angle weakly projecting anteriad; ocelli present. Clypeus coloured as frons, apex slightly darker; subtriangular, convex, smooth, with small basal median hump but not keeled or carinate, with fronto-clypeal suture curved. Labium yellow-brown with last segment longer than broad, shorter than penultimate. Antennae with scape short, ring-shaped, yellow-brown, and pedicel bulbous, yellow-brown with distinct basal black incomplete ring.

THORAX ( Fig. 34A, C–E). Brown. Pronotum darker in posterior portion; weak, paler median carina; subtriangular, projecting anteriorly; smooth with anterior margin carinate and pair of impressed points on each side of midline; lateral fields with some paler tubercles, forming two lines (along posterior margin, and oblique following midwidth), and very narrow behind eyes; paranotal lobes yellowish, turning dark brown along lateral margin (behind eye down to lateroventral angle), with posteroventral angle rounded and some yellowish tubercles along lateral margin. Mesonotum with median and peridiscal (sublateral) carinae distinct and slightly paler; smooth, weakly convex with shallow depression before paler scutellum. Tegulae yellowish brown.

TEGMINA ( Fig. 34A–D). Brown with main veins more or less concolourous (sometimes darker), elevated, and cross-veins weakly raised and paler than background; distinctly convex, and about 2.3 × as long as wide, with weak lateral hump including vein ScP+RA slightly around basal ¼, not hiding broadly rounded lateral margin in dorsal aspect; apical margin rounded; no distinct epipleuron; clavus closed, reaching to around 4 /5 of tegmen length. Venation: ScP+R rather short; ScP+RA long, curved, reaching external margin of tegmen around distal 1 /5 of tegmen length; RP unforked, long and weakly curved; first fork of MP and CuA around halflength, with first fork of CuA slightly more distal; MP1 with two or three terminales; Pcu and A1 fused at about 3 /5 of length of clavus, Pcu+A1 reaching apex of clavus; cross-veins numerous.

HIND WINGS ( Fig. 34F). Blackish brown, turning slightly darker in distal portion, and with slightly paler area along costal margin, before midlength; veins generally darker than background; well developed, with three 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, sinuate; second branch of CuA fused distally with CuP; Pcu and A1 fused on basal half, Pcu unforked and A2 simple; one transverse vein between second branch of ScP+R and MP, and between MP and first branch of CuA.

LEGS ( Fig. 34A–E). Yellow brown, slightly paler than tegmina, with apex of pro- and mesotibiae, and of pro- and mesotarsi, infuscate; all spines of posterior legs black apically. Anterior and median legs slightly flattened dorsoventrally, tibiae more slender than corresponding femora; posteroventral margin of pro- and mesofemora with row of minute teeth; pro- and mesotarsi moderately elongate. Metatibiae with two lateral spines in distal half, and six apical spines. Metatarsi rather short with first segment about as long as combined length of remaining segments. First metatarsomere with two latero-apical and five intermediate spines arranged in arc. Metatibiotarsal formula: (2) 6/ 7/ 2.

ABDOMEN ( Fig. 34B). Yellow-brown with median portion darker.

MALE TERMINALIA ( Figs 35–36). Pygofer ( Py – Fig. 35A–D) short, about 2.2 × as high as long at midheight in lateral view, with posterior margin rounded in lateral view, slightly sinuate in ventral portion; in caudal view suboval, 1.4 × as high as wide; dorsally deeply notched. Gonostyli ( G – Fig. 35A–D) relatively massive, moderately convex, with anterodorsal margin slightly, evenly convex, then distinctly upcurved at base of capitulum; ventral margin weakly rounded, with posterior angle rounded; posterodorsal margin weakly incurved, with a distinct hump at base of capitulum in lateral view; capitulum ( ca – Fig. 35A– D) moderately elongate and anteroposteriorly flattened, projecting anterodorsad and with moderate neck, apical point directed cephalad, in lateral view, posterior margin extending ventrad and curved to reach apex of basilateral spine curved lateroventrad; inner margin slightly emarginate with basal hump in caudal view. Anal tube ( An – Fig. 35A–D) distinctly elongate, dorsoventrally flattened, slightly widening from base to level of anal opening, then slightly, evenly tapering to round apical margin, and about 2.6 × as long as wide in dorsal view, anal opening around basal ⅓; in lateral view abruptly narrowing at anal opening, then moderately downcurved in distal portion. Aedeagus ( ae – Figs 35E–L, 36) symmetrical, elongate, distinctly curved posterodorsad in lateral view. Ventral lobe of periandrium ( vl – Figs 35G–L, 36E, G–L) laminate, slightly tapering towards spatulate distal portion, with apical margin rounded; slightly shorter than dorsal lobe and aedeagus sensu stricto. Dorsal lobe of periandrium ( dl – Figs 35E–L, 36A–E) more or less parellel-sided in dorsal view, distally forming rounded lobe with, on each side, slender dorsal spinose process ( dsp – Figs 35F, H–L, 36A–E) upcurved, sinuate in caudal view; basally to spinose process, reflexed lobe developed mesoventrad and narrowly conceiling ventral lobe ventrally. Aedeagus (sensu stricto, ae – Figs 35E–F, H–L, 36F–H) about same level as spinose processes of periandrium, bifid, each shaft more or less parallel-sided to obliquely truncate apex (apical margin weakly sinuate); lateroventral processes ( lvp – Figs 35G–L, 36F–H) extremely elongate and slender, arising in distal 1 / 6 and reaching base of aedeagus, curved ventrocephalad in lateral view, sinuate (inflated then strongly curved laterad basally) in caudal view, tapering towards pointed apex in distal portion. Connective ( co – Fig. 35H) well developed, corpus connective long, weakly curved in lateral view, tectiductus ( te – Fig. 35H) well developed, conical with anteroventral apodemes and wide anterior foramen.

Biology

Eusarima bourgoini sp. nov. was collected in the months of May and July, at altitudes between 350 and 1400 m a.s.l., in moist evergreen tropical forest. The specimens were sitting on small branches and leaves, on lower vegetation, bushes and trees. In Bach Ma National Park, it was found at the following collecting site/habitats ( Constant & Pham 2025a: fig. 2a): “pheasant trail” ( Constant & Pham 2025a: figs 2a(2), 3a), “roadside” ( Constant & Pham 2025a: figs 2a(4), 4a), and “summit” ( Constant & Pham 2025a: figs 2a(5), 4b).

Distribution

Vietnam: Thừa Thiên-Huế Province, Bach Ma National Park and Phong Dien District, and Da Nang Province, Ba Na-Nui Chua Nature Reserve ( Fig. 36I).