Gergithoides gnezdilovi, Jérôme Constant & Hong-Thai Pham, 2017

Jérôme Constant & Hong-Thai Pham, 2017, Gergithoides Schumacher, 1915 in Vietnam, with two new species, and taxonomic notes on the genus (Hemiptera: Fulgoromorpha: Issidae), European Journal of Taxonomy 296, pp. 1-20 : 5-8

publication ID 10.5852/ejt.2017.296

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scientific name

Gergithoides gnezdilovi

sp. nov.

Gergithoides gnezdilovi sp. nov. CCB 1-4572-B3DB-78DB3D9972C6

Figs 1–2 View Fig. 1 View Fig. 2 , 5 View Fig. 5


G. gnezdilovi sp. nov. can be recognized by the spiral-shaped trispinose process of the phallobase.


The species is dedicated to our colleague and friend Dr Vladimir M. Gnezdilov (St Petersburg, Russia), great specialist of the family Issidae .

Type material


VIETNAM: ♂, dissected, right hind wing mounted, Fig. 1A–E View Fig. 1 [Coll. I.R.Sc.N.B., Vietnam , Lam Dong prov., Bidoup-Nui Ba N.P., 12°26′ N 108°30′ E, 21-25.vii.2014, day coll., Leg. J. Constant & J. Bresseel, GTI Project, I.G.: 32.779 ] ( RBINS) GoogleMaps .


MEASUREMENTS AND RATIOS. LT: ♂ (n = 1): 5.2 mm. LTg/BTg = 2.0; BV/LV = 1.65; LF/BF = 1.2.

HEAD ( Fig. 1A, C–D View Fig. 1 ). Vertex broader than long in midline, brown with margins carinate and yellowish; in dorsal view, anterior margin convex, posterior one concave and lateral converging anteriorly; disc excavate, with obsolete tubercles. Side of head yellowish brown. Frons elongate and rugulose, brown; median carina yellowish, extending from dorsal margin down to level of base of eyes; row of yellowish tubercles along dorsal and lateral margins extending to level of base of eyes; lateral margins yellowish under eyes. Fronto-clypeal suture marked with yellowish colour at angles. Clypeus brown, elevated medially. Scape short, ring-shaped, black; pedicel bulbous, brown. Labium brown, with last segment longer than broad and shorter than penultimate.

THORAX ( Fig. 1A, C View Fig. 1 ). Brown. Pronotum very short, with median carina, and anterior and posterior margins carinate; disc concave; row of yellowish tubercles along anterior margin extending on paranotal fields to level of base of eyes; another oblique row of 3 yellowish tubercles on each side of disc, parallel to anterior margin. Mesonotum short, slightly coriaceous, with obsolete median carina and obsolete impressed point on each side of disc; transverse carina along anterior margin yellowish; 4–5 yellowish tubercles grouped at each external angle; yellowish spot on each side of scutellum; apex of scutellum marked with black. Tegulae brown.

TEGMINA ( Fig. 1A, C View Fig. 1 ). Strongly convex; broader than long when taken together in dorsal view; impressed at basocostal angle; subcoriaceous with dense reticulum of slightly raised veins and veinlets; main veins barely distinct basally; beige with broad transverse dark brown band at proximal third; small black spot in middle of sutural margin.

HIND WINGS ( Fig. 1E View Fig. 1 ). Brown, unilobed, with veins darker, slightly shorter than tegmina. Venation reticulate, with main longitudinal veins distinct basally (C, ScP+R, MP, CuA); numerous cross-veinlets. Anal area absent. Costal and cubital margins slightly sinuate, distal margin rounded.

LEGS ( Fig. 1A–D View Fig. 1 ). Elongate and slender, yellow-brown with dark brown line along externoventral margin of femora. Onychium of pro- and mesotarsi, apex of tibiae and of lateral spines of metatibiae dark brown. Posterior tibiae with 2 lateral spines on apical ⅓ and 6 apical spines.

Male genitalia

Pygofer higher than broad and with posterior margin strongly rounded, with base sinuate in lateral view ( Fig. 2A View Fig. 2 ); ventral margin rounded in lateral view ( Fig. 2A View Fig. 2 ). Gonostyli ( Fig. 2A, C View Fig. 2 ) elongate in lateral view, emarginate dorsally at base of capitulum; capitulum well developed, elongate and projecting dorsointernally; with small tooth on dorsal margin and a basolateral laminate process with anteroventral hook; convex externally at base of capitulum ( Fig. 2C View Fig. 2 ). Anal tube ( Fig. 2A–B View Fig. 2 ) 1.25 times as long as broad, slightly curved ventrally in lateral view, dorsoventrally flattened, with sides broadly rounded, sinuate on apical third, and apicolateral angles roundly projecting ventroposteriorly. Aedeagus strongly curved posterodorsally, rather simple ( Fig. 2D, F View Fig. 2 ). Phallobase with lateral process at basal half showing 3 spines; posterior spine hooked ventroanteriorly, ventroanterior spine curved dorsally and anterodorsal spine longer, projecting dorsally ( Fig. 2E–F View Fig. 2 ); phallobase with laminate process on each side, with right one projecting slightly further laterally than left one ( Fig. 2D–F View Fig. 2 ) and 2 median processes pointed apically ( Fig. 2E View Fig. 2 ). Ventral lobe of phallobase broad and truncate dorsally, slightly oblique apically ( Fig. 2E View Fig. 2 ).


G. gnezdilovi sp. nov. was collected at the end of July on lower vegetation, in moist evergreen mountain forest at an altitude around 1600 m a.s.l.


The species is currently recorded only from Bidoup-Nui Ba National Park, Lam Dong Province ( Fig. 5 View Fig. 5 ).


Colecao de Culturas de Basidiomicetos


Royal Belgian Institute of Natural Sciences