Platygonia nigra, Quintas & Pecly & Carvalho & Mejdalani, 2022

Quintas, Victor, Pecly, Nathalia H., Carvalho, Stéphanie R. & Mejdalani, Gabriel, 2022, Platygonia Melichar, 1925 (Insecta: Hemiptera: Cicadellidae: Cicadellini): a new species from the Brazilian Amazon Rainforest, key to species of the genus, and notes on P. undecimmaculata (Fowler, 1899), European Journal of Taxonomy 806 (1), pp. 177-186 : 179-182

Platygonia nigra sp. nov.

urn:lsid:zoobank.org:act:D2D0436E-58E8-4F12-8557-77BF4A668952

Figs 1–6

Diagnosis

Ground color of dorsum dark brown to black with single white to pale yellow subtriangular spot at distal portion of corium ( Figs 1–2 ); male pygofer with conspicuous diagonal cleft ( Fig. 3 ); connective Y-shaped, keeled, with stem longer than arms ( Fig. 5 ); aedeagus with unpaired basiventral process ( Fig. 6 ).

Etymology

The specific epithet, ‘ nigra ’, refers to the mostly dark brown to black dorsum ( Figs 1–2 ) of the new species.

Type material

Holotype BRAZIL • ♂; “BRASIL: AM (State of Amazonas), Ipixuna , Rio \ Gregório, Com. [Comunidade] Lago Grande \ no Seringal do Recreio \ 07º10’06”S 070º49’06”W 145m \ 18-23.v.2011 Malaise Cavichioli, \ Gonçalves, Rafael, Takiya et al.”; INPA.

Paratype BRAZIL • 1 ♂; same collection data as for holotype, except “ 17-23.v.2011 light trap \ Cavichioli, Gonçalves & Takiya ”; DZRJ .

Type locality

Ipixuna, State of Amazonas, Northern Brazil.

Measurements

Total length: holotype (♂) 7.3 mm, paratype (♂) 7.4 mm.

Description

Male

COLORATION. Ground color of dorsum (head, pronotum, mesonotum, and forewings) dark brown to black ( Figs 1–2 ). Anterior margin of crown light brown to brown. Distal portion of forewing corium with white to pale yellow subtriangular spot extending from costal margin to outer margin of outer anteapical cell. Face ( Fig. 2 ) with frons, clypeus, lorum, maxillary plate, gena, labrum, and labium mostly pale yellow. Thorax and legs ( Fig. 2 ) mostly pale yellow.

BODY. Dorsoventrally flattened.

HEAD ( Figs 1–2 ). In dorsal view, strongly produced anteriorly; median length of crown greater than interocular width and about 8/10 transocular width; anterior margin narrowly rounded; with distinct carina at transition from crown to face; ocelli located slightly before transverse imaginary line between anterior eye angles, each ocellus slightly closer to median line of crown than to adjacent anterior eye angle; disk depressed from ocelli to apex; with inconspicuous median longitudinal fovea; frontogenal suture extending onto crown and attaining ocellus. Antennal ledge, in dorsal view, slightly protuberant; in lateral view, with anterior margin oblique. Face with disk of frons depressed medially; muscle impressions distinct. Clypeus with profile continuing contour of frons.

THORAX ( Figs 1–2 ). With pronotal width slightly smaller than transocular width of head; lateral margins of pronotum approximately parallel; posterior margin concave; dorsolateral carina complete, almost rectilinear, declivous anteriorly; disk transversely rugose, except on anterior third; mesonotum with scutellum not striate. Forewing ( Figs 1–2 ) without distinct apical membranous area; apex convex; veins mostly distinct, not elevated; with four apical cells, base of fourth more proximal than base of third; without anteapical plexus of veins; texture coriaceous, without sculpturing. Hind wing with vein R 2+3 incomplete. Hind leg with femoral setal formula 2:1:1; length of first tarsomere greater than combined length of two more distal tarsomeres, with two parallel rows of small setae on plantar surface.

TERMINALIA.With pygofer ( Fig. 3 ), in lateral view, moderately produced posteriorly; disk with conspicuous diagonal cleft; posterior margin convex; macrosetae distributed on area of disk below diagonal cleft, except basally. Subgenital plate ( Fig. 4 ), in ventral view, subtriangular; distal half strongly narrowed; not extending posteriorly as far as pygofer apex; with uniseriate macrosetae along outer margin; plates not fused to each other basally. Style ( Fig. 5 ), in dorsal view, extending posteriorly approximately as far as apex of connective; without preapical lobe; apex truncate, with pair of tiny projections. Connective ( Fig. 5 ), in dorsal view, Y-shaped; arms poorly developed; stem longer than arms, distinctly keeled. Aedeagus ( Fig. 6 ) symmetrical; shaft, in lateral view, short, with conspicuous unpaired basiventral process directed anterad; gonopore located apically. Paraphyses absent.

Female

Unknown.

Remarks

Among the known species of Platygonia , the male terminalia of P. nigra sp. nov. ( Figs 3–6 ) are most similar to those of P. praestantior and P. spatulata . However, the new taxon can be readily distinguished from the latter two species, as well as from the remaining ones of the genus, by the combination of features given above in the diagnosis. Its color pattern ( Figs 1–2 ) is unique within the genus, thus allowing an easy identification.

Figures

Figs 1–2. Platygonia nigra sp. nov., holotype, ♂ (INPA). 1. Body, dorsal view. 2. Body, lateral view. Scale bars = 2 mm.

Figs 3–6. Platygonia nigra sp. nov., holotype, ♂ (INPA). 3. Pygofer, lateral view. 4. Subgenital plate, ventral view. 5. Connective and style, dorsal view. 6. Aedeagus, lateral view. Scale bars: 3 = 0.5 mm; 4–6 = 0.25 mm.