Longieusarima 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 : 84-90

Longieusarima bachmana sp. nov.

urn:lsid:zoobank.org:act:

Figs 41–44

Diagnosis

Longieusarima bachmana sp. nov. can be recognized by (1) a rather large size ( ♂: 7.0– 7.6 mm, ♀: 7.5– 8.1 mm) and wide vertex (1.4 × as wide as long in midline); (2) the posterior margin of the pygofer in lateral view developed in a large lobe in dorsal half ( Py – Fig. 42A); (3) the moderately long lateroventral processes of the aedeagus ( lvp – Fig. 43F–H).

Differential diagnosis

The new species is close to Longieusarima lunulia Wang, Bourgoin & Zhang, 2017 (see illustrations in Wang et al. 2017: figs 27–47 and in Constant & Pham 2024a: figs 31–32) but the latter is smaller ( ♂: 6.3–7.0 mm, ♀: 7.0– 7.3 mm compared to ♂: 7.0– 7.6 mm, ♀: 7.5–8.1 in L. bachmana sp. nov.), shows a large posterior lobe of the posterior margin of the pygofer in the ventral portion of the pygofer (large posterior lobe developed in the upper portion of the pygofer in L. bachmana ) and longer lateroventral processes of the aedeagus, reaching near base of the aedeagus sensu stricto (reaching basal ¼ of aedeagus in L. bachmana ).

Etymology

The species epithet refers to Bach Ma National Park, where the species was 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 – Thiên-Huế Province • 3 ♂♂, 1 ♀; same data as for holotype; VNMN • 2 ♂♂, 3 ♀♀; same data as for holotype; I.G.: 34.640; RBINS • 1 ♂; 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; VNMN • 1 ♂, 1 ♀; same data as for preceding; I.G.: 34.640; RBINS • 1 ♂; 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; I.G.: 34.640; RBINS • 1 ♂; Bach Ma National Park , stairs going up to Hai Vong Dai; 16°11′53.77″ N, 107°51′26.92″ E; 1272 m a.s.l.; 16 Sept. 2024; T. T. H. Nguyen leg.; by net; VNMN • 1 ♀; Bach Ma National Park , campsite; 691 m a.s.l.; 26 May 2024; T. T. H. Nguyen leg.; light trap; VNMN .

Description

MEASUREMENTS AND RATIOS. LT: ♂ (n = 9): 7.2 mm (7.0–7.6), ♀ (n = 5): 7.8 (7.5–8.1); LT/BB = 2.29; LTg/ BTg = 2.57; LW/BW = 1.36; BV/LV = 1.40; LF/BF = 0.87.

HEAD ( Fig. 41A–E). Vertex 1.4 × as broad as long in midline, yellow-brown often with paler obsolete fine median line, and narowly darker along anterior margin; anterior margin rounded, posterior one distinctly concave and lateral weakly diverging towards the anterior; all margins weakly carinate; disc more or less flat. Genae yellowish, washed with brown at anterodorsal and anteroventral angles; anteroventral angle projecting anteriorly. Frons 1.15 × as wide as long in midline, brown, darker dorsally between dorsal margin and peridiscal carina, and along lateroventral angles; distinct yellowish curved transverse narrow line in middle of disc; widest under level of antennae and weakly 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; margins moderately carinate, more strongly in ventral angle; frontoclypeal suture rounded. Clypeus brown, darker apically, 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, daker basally and posteriorly.

THORAX ( Fig. 41A, C–D). Brown. Pronotum often somewhat darker in posterior portion; in midline about half the midline length of mesonotum; paler median line with impressed point on each side, around midlength; anterior margin distinctly carinate, angularly projecting cephalad, posterior margin weakly incurved in middle; lateral fields very narrow; paranotal lobes yellow-brown with distinct black marking in ventral inner angle and along external margin. Mesonotum subtriangular with median blunt carina, peridiscal carinae slightly sharper; shallowly depressed at base of scutellum. Tegulae brown.

TEGMINA ( Fig. 41A–E). Brown with pale yellowish transverse veinlets and irregular spots, and veins ScP+RA and RP blackish brown; strong lateral hump in basal ⅓ at level of ScP+R vein, shortly hiding costal margin in dorsal view; vein RP hiding costal margin in dorsal view, in distal portion of tegmina; longitudinal veins raised; epipleuron (= hypocostal plate) well developed; about 1.9 × longer than wide when taken together in dorsal view; clavus very elongate, closed. Venation: ScP+R dividing close to base; ScP+RA curved, rather short, disappearing around proximal 2 /5 of tegmen length; RP very long, weakly curved, nearly reaching to outer margin of tegmen; MP vein first fork around 2 /5 of tegmen length; MP 1 forked at about apical 1 /6; CuA vein first fork at about midlength of tegmen; veins Pcu and A1 fused around 3 /5 of clavus length, Pcu+A1 reaching apex of clavus.

HIND WINGS ( Fig. 41F). Brown, darker towards apical and posterior margins; rather elongate with 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, weakly sinuate; second branch of CuA fused with CuP distally; Pcu and A1 fused on basal half, Pcu and A2 simple; transverse vein between second branch of ScP+R and MP, and between MP and first branch of CuA; A2 not forked.

LEGS ( Fig. 41A–E). 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 half and seven 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 ( Figs 42–43). Pygofer ( Py – Fig. 42A–D) massive, 1.8 × higher than long at halfheight in lateral view; in lateral view, anterior margin more or less straight, posterior margin with dorsal 1/10 portion strongly sinuate and tapering to a dorsal digitiform process directed caudad, and remaining part strongly projecting caudad in large round lobe more developed in dorsal portion; in caudal view, 1.3 × higher than wide. Gonostyli ( G – Fig. 42A–D) distinctly convex, nearly subtriangular with posterior angle rounded in lateral view, with anterodorsal margin oblique, ventral margin broadly rounded and posterodorsal margin slightly sinuate (no distinct posterior lobe); capitulum ( ca – Fig. 42A–D) with wide, undefined neck, anteroposteriorly flattened, rather strongly curved anterodorsad in lateral view, with apical margin obliquely, somewhat roundly truncate in caudal view, with anteapical lateral obliquely flattened hook curved lateroventrad (in caudal view). Anal tube ( An – Fig. 42A–D) elongate and rather narrow, suboval with maximum width at anal opening, distinctly convex longitudinally, apically rounded, ventral margin more or less straight in lateral view; about 2.8 × as long in midline, as wide in dorsal view and with anal opening slightly beyond basal 2 /5. Aedeagus ( Figs 42E–L, 43) symmetrical, moderately elongate, more or less evenly curved posterodorsad in lateral view, with ventral margin basally expanded in pair of massive compressed lobes. Ventral lobe of periandrium ( vl – Figs 42G–L, 43B–E) shorter than dorsal lobe, laminate, spatulate, moderately constricted in basal ⅓, apically roundly truncate with distinct middle notch. Dorsal lobe of periandrium ( dl – Figs 42E–F, H–L, 43A–E) constricted basally, then sinuate with sides subparallel (slightly tapering) in dorsal view; median portion distinctly elevated in distal half, rounded apically in middle and with triangular apicolateral angles recurved cephalad. Aedeagus (sensu stricto, ae – Figs 42H–J, 43F–H) elongate, deeply bifid, each shaft obliquely truncate apically in dorsal view; pair of elongate lateroventral processes ( lvp – Figs 42E–L, 43F–H) arising anteapically (around 5 /6 of aedeagus length), anterodorsally curved in lateral view and reaching basal ¼ of aedeagus; strongly curved basally then broadly, evenly curved to pointed apex in dorsal view. Connective ( co – Fig. 42I) well developed, corpus connective long, weakly curved in lateral view, tectiductus ( te – Fig. 42I) well developed, conical with anteroventral apodemes and wide anterior foramen.

Biology

Longieusarima bachmana sp. nov. was collected in the months of May and September at altitudes between 500 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 ( Fig. 43I).