Eusarima ( Eusarima ) bachmana, 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 : 58-63

Eusarima ( Eusarima) bachmana sp. nov.

urn:lsid:zoobank.org:act:

Figs 28–30

Diagnosis

Eusarima ( Eusarima) bachmana sp. nov. can be recognized by the following combination of characters: (1) the frons uniformly yellow-brown ( Fig. 28E); (2) the anterodorsal margin of the gonostyli moderately, evenly convex in lateral view ( G – Fig. 29A); (3) the anal tube in dorsal view ( An – Fig. 29D), 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 parallel-sided portion ending in round apical margin; (4) the dorsal lobe of the periandrium more or less parellel-sided in dorsal view ( dl – Fig. 30A), distally forming a rounded lobe with, on each side, a dorsal spinose process ( dsp – Fig. 30C) upcurved and somewhat spiralate (sinuate in caudal view); (5) the lateroventral processes of the aedeagus ( lvp – Fig. 30F–H) robust, arising in distal 1 / 6, curved ventrocephalad in lateral view and reaching at least halflength of aedeagus.

Differential diagnosis

Eusarima ( Eusarima) bachmana sp. nov. can be separated from E. ( Eusarima) boevei sp. nov. by its uniformly yellow-brown frons (showing a transverse yellowish band in the latter) and its longer lateroventral processes of the aedeagus reaching to at least halflength of the aedeagus (not surpassing 3 /5 of aedeagus length in the latter); it can be separated from E. ( Eusarima) bourgoini sp. nov. by the lateroventral processes of the aedeagus, much longer, reaching the base of the aedeagus in the latter species.

Etymology

The species epithet refers to Bach Ma National Park, where the species was first discovered.

Type material

Holotype

VIETNAM • ♂; Th ừa Thiên-Huế Province, 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; VNMN.

Paratypes

VIETNAM – Th ừa Thiên-Huế Province • 1 ♂; same data as for holotype; VNMN • 2 ♂♂; same data as for holotype; I.G.: 34.640; RBINS .

Description

MEASUREMENTS AND RATIOS. LT: ♂ (n = 4): 5.5 mm (5.5–5.6); LT/BB = 1.90; LTg/BTg = 2.20; LW/BW = 1.29; BV/LV = 2.07; LF/BF = 0.89.

HEAD ( Fig. 28A–E). Vertex yellow-brown, often paler in posterior portion, with fine, obsolete median carina; 2.1 × 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 moderately carinate. Frons yellow-brown; 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; widest at level of antennae. Genae yellow-brown, paler than frons, with anteroventral angle weakly projecting anteriad; ocelli present. Clypeus coloured as frons, sometimes apex 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 basiventral black marking.

THORAX ( Fig. 28A, C–E). Yellow-brown. Pronotum with weak, paler median carina; subtriangular, projecting anteriorly; smooth with anterior margin carinate and pair of impressed points on each side of midline; lateral fields very narrow behind eyes; paranotal lobes with posteroventral angle rounded. Mesonotum yellow-brown, with median and peridiscal (sublateral) carinae distinct and slightly paler, smooth, weakly convex with shallow depression before scutellum. Tegulae yellowish brown.

TEGMINA ( Fig. 28A–D). Uniformly yellow-brown with main veins more or less concolourous (sometimes darker), elevated, and cross-veins weakly raised and generally paler than background; distinctly convex, and about 2.2 × as long as wide, with weak lateral hump including vein ScP+RA slightly before basal ⅓, not hiding broadly rounded lateral margin in dorsal aspect; apical margin rounded; no epipleuron; clavus closed, reaching to about ¾ 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 around 2 / 5 of tegmen, MP1 with two terminales; first fork of CuA more distal, slightly before halflength of tegmen; Pcu and A1 fused at about 3 /5 of length of clavus, Pcu+A1 reaching apex of clavus; cross-veins numerous, more or less evenly spaced.

HIND WINGS ( Fig. 28F). Blackish brown, turning slightly darker in distal portion, and with paler area along costal margin, around 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. 28A–E). Yellow brown, slightly paler than tegmina; 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 six intermediate spines arranged in arc. Metatibiotarsal formula: (2) 6/ 8/ 2.

ABDOMEN ( Fig. 28B). Yellow-brown.

MALE TERMINALIA ( Figs 29–30). Pygofer ( Py – Fig. 29A–D) short, about 2.5 × as high as long at midheight in lateral view, with posterior margin broadly rounded in lateral view; in caudal view suboval, 1.3 × as high as wide; dorsally deeply notched. Gonostyli ( G – Fig. 29A–D) relatively massive, moderately convex, with anterodorsal margin moderately, evenly convex, then upcurved at base of capitulum; ventral margin nearly straight with posterior angle rounded; posterodorsal margin weakly incurved, with a distinct hump at base of capitulum in lateral view; capitulum ( ca – Fig. 29A–C) rather elongate and anteroposteriorly flattened, projecting dorsad 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 more or less straight in caudal view. Anal tube ( An – Fig. 29A–D) distinctly elongate, dorsoventrally flattened, slightly widening from base to level of anal opening, then slightly tapering to parallel-sided portion ending in round apical margin, and about 2.6 × as long as wide in dorsal view, anal opening in basal ⅓; in lateral view abruptly narrowing at anal opening, then weakly sinuate, downcurved in distal portion. Aedeagus ( ae – Figs 29E–L, 30) symmetrical, elongate, distinctly curved posterodorsad in lateral view, more so in distal portion. Ventral lobe of periandrium ( vl – Figs 29G–L, 30A–E) laminate, slightly tapering towards spatulate distal portion, with apical margin round; slightly shorter than dorsal lobe and aedeagus s. str. Dorsal lobe of periandrium ( dl – Figs 29E–L, 30A–D) more or less parellel-sided in dorsal view, distally forming rounded lobe with, on each side, dorsal spinose process ( dsp – Figs 29E–I, 30A–E) upcurved, somewhat spiralate (sinuate in caudal view); basally to spinose process, reflexed lobe developed mesoventrad and partly conceiling ventral lobe ventrally. Aedeagus (sensu stricto, ae – Figs 29E–J, 30F–H) slightly shorter than spinose processes of periandrium, bifid, each shaft more or less parallel-sided to obliquely truncate apex; lateroventral processes ( lvp – Figs 29G–L, 30F–H) robust, arising in distal 1 /6 and reaching at least halflength of aedeagus, curved ventrocephalad in lateral view, sinuate (inflated, then strongly curved laterad basally) in caudal view, rather elongate (= ½ of length of aedeagus) and more or less evenly tapering towards pointed apex. Connective ( co – Fig. 29G) well developed, corpus connective long, weakly curved in lateral view, tectiductus ( te – Fig. 29G) rather well developed, conical with anteroventral apodemes and wide anterior foramen.

Biology

Eusarima bachmana sp. nov. was collected in May at altitudes between 1300 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): “summit” ( Constant & Pham 2025a: figs 2a(5), 4b).

Distribution

Vietnam: Thừa Thiên-Huế Province, Bach Ma National Park ( Fig. 30I).