Erythrogonia dalvae, Quintas & Silva & Takiya & Mejdalani, 2025

Quintas, Victor, Silva, Adriane P., Takiya, Daniela M. & Mejdalani, Gabriel, 2025, Exploring the diversity of leafhoppers from Brazil: five new species of Erythrogonia Melichar (Insecta: Hemiptera: Cicadellidae: Cicadellini), Zootaxa 5686 (2), pp. 249-269 : 254

Erythrogonia dalvae sp. nov.

Length. Male holotype 6.6 mm.

( Figs. 8 , 18–23 )

Head ( Figs. 8 , 18 ). Median length of crown approximately 0.7 of interocular width and 0.5 of transocular width; ocelli located approximately on imaginary line between anterior angles of compound eyes, each ocellus closer to adjacent anterior eye angle than to median line of crown; coronal surface smooth, without shallow median concavity; coronal suture distinct. Face with muscle impressions of frons distinct; epistomal suture obscure medially; clypeus continuing profile of frons on upper portion and more nearly horizontal on lower portion.

Thorax ( Fig. 8 ). Pronotum, in dorsal view, with width slightly smaller than transocular width of head; lateral margins slightly convergent anteriorly; posterior margin approximately rectilinear; dorsolateral carina incomplete, almost rectilinear, oblique. Mesonotum with scutellum not transversally striate. Forewing with membrane well-delimited, including all apical cells except base of fourth; veins mostly distinct, not elevated; with three anteapical cells. Other features of head and thorax as in the generic description ( Young 1977, p. 767).

Male terminalia. Pygofer ( Fig. 19 ), in lateral view, moderately produced posteriorly; posterior margin slightly acute; with spiniform process at apical portion ( Fig. 20 ); macrosetae distributed mostly on apical third of disk. Subgenital plate ( Figs. 21, 22 ), in ventral view, elongate and slender, subtriangular; in lateral view, apical portion with dorsal lobe, expanded; with macrosetae along lateral margin; plate not fused to its counterpart at base. Connective ( Figs. 21, 22 ), in dorsal view, T-shaped, arms short and broad, stalk with median keel. Style ( Fig. 21 ), in dorsal view, extending posteriorly beyond apex of connective; without preapical lobe, apex rounded and directed inwards. Aedeagus ( Fig. 23 ) symmetrical; shaft, in lateral view, elongate, tubular, curved dorsally, with apex directed ventrally, with pair of ventral spiniform processes at apex. Paraphyses ( Figs. 21, 22 ), in lateral view, not extending posteriorly beyond subgenital plates, with pair of strong rami directed dorsally at base and then curved posteroventrally; base of rami, in dorsal view, subquadrate.

Female unknown.

Color ( Figs. 8 , 18 ). Crown mostly brown, with ivory triangular spot extending from anterior to posterior margin. Eyes dark brown. Pronotum reddish-brown, with ivory spot at median portion extending from anterior to posterior margin, narrowed posteriorly; lateral portions of disk brown. Mesonotum reddish-brown, with ivory spot covering most of its surface; lateral portions brown (coronal, pronotal, and mesonotal spots continuous). Forewing reddish-brown; clavus mostly ivory, except at basal portion, median portion with semicircular dark reddish-brown spot adjacent to claval sulcus; corium with three ivory markings, first one at basal third adjacent to claval sulcus, not extending to costal margin, second one elongate and located along costal margin, third one adjacent to apical portion of clavus. Ground color of face yellow. Lateral and ventral portions of meso- and metathorax with yellow areas; legs mostly yellow.

Etymology. The new species name, dalvae , is given in honor of Dalvarina Marcos de Sousa, grandmother of the first author.

Material examined. Brazil , state of Amazonas. Male holotype: “ BRASIL, Amazonas \ Manicoré, Cachoeira \ 05°29’44’’S 60°49’21’’W \ Malaise de solo \ Floresta úmida \ ix.2004, Silva & Pena leg.” ( INPA) .

Taxonomic notes. Erythrogonia dalvae sp. nov. is similar to E. fissonustula ( Jacobi, 1905) and E. kokomona Medler, 1963 . These three species share similar spots on crown and pronotum. Nevertheless, E. dalvae sp. nov. can be easily distinguished by presence of spots on forewings ( Fig. 8 ), absence of process at ventral margin of pygofer ( Fig. 19 ), and aedeagus with a pair of spiniform processes at apex ( Fig. 23 ).

Figures

FIGURES 7–11. Dorsal habitus of holotypes of five new Brazilian species of Erythrogonia (antennae and legs omitted). 7, E. peclyae sp. nov. (Roraima); 8, E. dalvae sp. nov. (Amazonas); 9, E. adolfoi sp. nov. (Acre); 10, E. dmitrievi sp. nov. (Maranhão); 11, E. dietrichi sp. nov. (Goiás). Scale bars = 1 mm.

FIGURES 18–23. Erythrogonia dalvae sp. nov. Male. 18, face, anterior view; 19, pygofer, lateral view; 20, apical process of pygofer, posterior view; 21, subgenital plates, styles, connective, and paraphyses, dorsal view; 22, subgenital plate, styles, connective, and paraphyses, lateral view; 23, anal tube, ejaculatory bulb, and aedeagus, lateral view. Scale bars = 0.5 mm.