Neogergithoides scapularis, Constant & Pham, 2024

Constant, Jérôme & Pham, Hong Thai, 2024, 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), European Journal of Taxonomy 919 (1), pp. 1-87 : 37-39

Neogergithoides scapularis sp. nov.

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Figs 1 , 2H , 20–21

Diagnosis

Neogergithoides scapularis sp. nov. can be recognized by

(1) the colour pattern of the tegmina with yellow shoulders followed by a contrasting black band and large posterior portion variegated yellow and dark brown to black ( Fig. 20A, C );

(2) the gonostyli moderately produced posteriorly and with dorsal margin in a straight angle at base of capitulum (G – Fig. 21A );

(3) the pygofer about 2.7 times as high as long with maximum length at about half height (Py – Fig. 21A );

(4) the strongly curved, U-shaped aedeagus with periandrium with lateral strongly recurved laterovenral process projecting cephalad (lvp – Fig. 21E–F ).

Differential diagnosis

The closest species are N. grootaerti Constant & Pham, 2015 and N. baviana Constant & Pham, 2015 but N. scapularis sp. nov. differs by the contrasting yellow shoulder of the tegmina directly followed by a black band (less contrasted pattern in both other species – Constant & Pham 2015: figs 1a, 4a), a narrower pygofer in lateral view (2.7 times as high as long; less than 2.2 times in both other species), the strongly curved, U-shaped aedeagus in lateral view (more weakly curved in both other species – Constant & Pham 2015: figs 2d, 5d), the lateroventral process strongly recurved, hook-shaped, projecting cephalad (more weakly and not abruptly curved in N. grootaerti – Constant & Pham 2015: fig. 2d; only weakly curved in N. baviana – Constant & Pham 2015: fig. 5d) and the lateroventral processes situated in the distal half of the aedeagus (in basal half in both other species).

Etymology

The species epithet derives from ‘ scapula ’, the Latin word for ‘shoulder’, and refers to the yellow marking at the base of the tegmina in this species.

Type material

Holotype

VIETNAM • ♂ (dissected – Figs 20–21 ); 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.

Paratypes

VIETNAM • 1 ♀; same collection data as for holotype; VNMN.

Description

MEASUREMENTS AND RATIOS. LT: ♂ (n = 1): 6.1 mm, ♀ (n = 1): 7.4; LT/BB = 1.4; LTg/BTg = 1.84; BV/ LV = 1.0; LF/BF = 1.5.

HEAD ( Fig. 20A–D ). Vertex subquadrate, slightly elongate, yellowish on sides and anterior half, with a large brown median marking in posterior half followed by more or less V-shaped black marking in anterior half; margins carinate, anterior one black with middle yellowish marking, posterior one yellowish and lateral ones elevated and black; in dorsal view, anterior margin convex, posterior one concave and lateral subparallel; disc excavate with narrow longitudinal groove in basal half. Side of head yellowish, narrowly black-brown along dorsal margin and around eye; black-brown line from ventral margin of eye to frontoclypeal suture, posteroventral portion behind black line, brown. Frons elongate and smooth, chestnut brown with sides carinated, yellowish, and yellowish median carina extending to apex of clypeus, yellowish carinae margined with black. Clypeus brown to black, elevated in a blunt carina medially and with lateral yellowish line prolongating lateral carinae of frons. Labium brown with last segment longer than broad, and shorter than penultimate. Scape short, ring-shaped; pedicel bulbous, dark brown.

THORAX ( Fig. 20A–D ). Anterior face of prothorax behind eyes, black; posterior margin with pale yellowish line extending laterally to midlength of paranotal lobes; pronotum very short with posterior margin and discal carinae laminate; disc concave with 2 impressed points, brown with pale yellowish obsolete median carina and tubercles; broad dark brown to black line extending from behind eye to lateroventral angle of paranotal lobes; inner portion brown, paler; inner ventral angle of paranotal lobe with pale yellowish marking extending into a fine line along ventral margin. Mesonotum short, slightly rugulose with obsolete impressed point on each side of disc; transverse carina along anterior margin; brown, yellowish along lateroposterior margins and median portion; scutellum dark brown to black. Tegulae dark brown.

TEGMINA ( Fig. 20A, C ). Broadly semicircular, subcoriaceous; yellow basally then with broad black transverse band at basal ¼ to basal ⅓; posterior ⅔ yellowish with veins brown to black; more or less distinct brown to black marking on disc at midlength and darker, poorly marked transverse band at ¾ of tegmina length; submarginal narrow black line from anterior angle to posterosutural angle, running on margin only on basal 1/5; distal half of lateral margin and posterior one very narrowly bordered with black-brown. Venation reticulate with main longitudinal veins barely distinct basally and numerous cross-veinlets.

LEGS ( Fig. 20A–D ). Elongate and slender, yellow-brown with darker and paler markings. Tarsi, broad longitudinal zones on femora, carinae and apex of anterior and median tibiae, and lateral spines of posterior tibiae, dark brown. Posterior tibiae with 2 lateral spines on apical ⅓ and 6 apical spines. Metatibiotarsal formula: (2) 6 / 8 / 2.

ABDOMEN ( Fig. 20B ). Yellow-brown ventrally with posterior margin of sternites bordered with blackish line followed with fine yellowish line.

MALE TERMINALIA. Pygofer (Py – Fig. 21A–D ) about 2.7 times as high as long at mid-height and with posterior margin strongly sinuate and roundly projecting posteriorly in middle portion in lateral view ( Fig. 21A ); more or less round in caudal view. Gonostyli (G – Fig. 21A–B, D ) rather short with apical margin rounded and forming abrupt straight angle at base of capitulum in lateral view; capitulum (ca) well developed, elongate and projecting mesodorsad, with 2 somewhat laminate hooked processes on dorsal margin separated by round emargination, basolateral laminate process hooked anteroventrally and deep basal transverse groove. Anal tube (An – Fig. 21A–D ) 1.2 times as long in midline as wide, curved ventrad in lateral view, dorsoventrally flattened with sides broadly rounded, diverging from base to ⅔ of length and with posterior margin moderately bisinuate. Aedeagus ( Fig. 21E–J ) strongly upcurved, U-shaped and rather simple. Periandrium with lateral strongly recurved hook-shaped lateroventral process projecting cephalad at about half length (lvp – Fig. 21E–F ); distal portion of process slightly sinuate in lateral and ventral aspect ( Fig. 21G–H ); laminate lateral process on each side terminated with an inner weak tooth surpassing ventral lobe of periandrium (vl – Fig. 21E–G ). Ventral lobe of periandrium broad, truncate apically with median minute emargination and with apicolateral angles rounded. Dorsal lobe of periandrium strongly bisinuate apically in dorsal view (dl – Fig. 21I ).

Biology

Neogergithoides scapularis sp. nov. was collected in August on lower vegetation and bushes, in moist evergreen tropical forest at about 550 m in altitude ( Figs 1B , 2H ).

Distribution

Vietnam: Quang Ninh Province, Dong Son-Ky Thuong Nature Reserve ( Fig. 1A ).

Figures

Fig. 1. Dong Son-Ky Thuong Nature Reserve. A. Topographic map. B. Sampled habitat.

Fig. 2. Issidae Spinola, 1839 in nature in Dong Son-Ky Thuong Nature Reserve. A. Kodaianella mua sp. nov. B. Longieusarima lunulia Wang, Bourgoin & Zhang, 2017. C–D. Rostrolatum curviceps sp. nov. E. Fortunia sp., nymph. F. Hemisphaerius bresseeli sp. nov. G. Maculergithus luteomaculatus (Constant & Pham, 2016). H. Neogergithoides scapularis sp. nov.

Fig. 20. Neogergithoides scapularis sp. nov., dissected holotype, ♂ (RBINS). A. Habitus, dorsal view. B. Habitus, ventral view. C. Habitus, lateral view. D. Habitus, perpendicular view of frons.

Fig. 21. Neogergithoides scapularis sp. nov., holotype, ♂ (RBINS), terminalia. A–D. Pygofer, anal tube and gonostyli. A. Lateral view. B. Laterocaudal view. C. Dorsal view. D. Caudal view. E–J. Aedeagus and connective. E. Left lateral view. F. Right lateral view. G. Caudal view. H. Ventral view. I. Dorsal view. J. Anterodorsal view. Abbreviations: see Material and methods.