Metacephalus adustus, Souza, Takiya & Felix, 2017

Souza, Stephanie Pereira De, Takiya, Daniela Maeda & Felix, Márcio, 2017, Two new Metacephalus DeLong & Martinson, 1973 species (Hemiptera: Cicadellidae: Portanini) from Brazil and proposed synonymy with Paraportanus Carvalho & Cavichioli, 2009, Zootaxa 4281 (1), pp. 176-185 : 180-182

Metacephalus adustus sp. nov.

( Figure 2 )

Type locality. Comunidade São Vicente , Rio Liberdade, Ipixuna, Amazonas State, Brazil.

Diagnosis. Crown, pronotum, and mesonotum (Fig. 11) without bright orange maculae. Pygofer lobes (Fig. 15) subrectangular; without apical processes; posterior margin obliquely truncate. Aedeagus (Figs. 19, 20) with shaft curved dorsally; apex with pair of elongate spiniform processes, which are divergent and directed anteroventrally.

Measurements (mm). Males: body length, 5.9; crown length, 0.4; transocular width, 1.4; interocular width, 0.6–0.7; maximum pronotum width, 1.5; forewing length, 4.9–5.0. Females unknown.

Description. Head (Figs. 11–14), in dorsal view, with anterior margin rounded; crown median length threetenths of transocular width; lateral frontal sutures reaching ocelli; texture shagreen, except in light areas. Pronotum (Figs. 11, 14) wider than transocular width; lateral margins angulate; dorsopleural carina conspicuous; posterior margin straight; texture smooth. Mesonotum (Figs. 11, 14) with scutum smooth and scutellum shagreen. Forewings (Figs. 11, 12) with conspicuous venation; three closed anteapical cells. Hind legs with femoral setal formula 2+2+1; tibiae with rows AD and PD with 8–9 long cucullate setae intercalated by 0–3 shorter cucullate ones; first tarsomeres slightly longer than combined length of second and third ones, each posterior margin with three platellae between pair of outer slightly longer cucullate setae.

Coloration. Crown (Fig. 11) mostly dark brown; with pair of subquadrate maculae equidistant from eyes and from each other, closer to posterior margin, and inverted T-shaped median macula, ivory to light orange; two pairs of light-orange spots near inner margins of compound eyes, one anterior and one posterior; ivory area around ocelli. Ocelli red. Face ivory to pale- yellow with several brown maculae; dark brown area under antennal pits. Pronotum (Fig. 11) dark brown with several ivory speckles; pair of light yellow spots near anterior margin, behind compound eyes. Mesonotum (Fig. 11) mostly discolored, light brown, with paired light yellow spots over ends of scutoscutellar sutures. Forewings (Figs. 11, 12) with coria mostly brown, veins marked with dark brown; clavi dark brown, veins marked with opaque light brown with apices white. Thoracic venter mostly brownish-yellow.

Male genitalia. Pygofer lobes (Fig. 15), in lateral view, longer than high, subrectangular; posterior margins obliquely truncate; ventral margins thickened; long macrosetae distributed near dorsal margin at midlength of lobe; microsetae distributed on dorsal area at apical half. Valve (Fig. 16), in ventral view, wider than long; posterior margin produced mesally. Subgenital plates (Figs. 15, 16), in lateral view, extending slightly posteriorly farther than pygofer apex; apices slightly turned dorsally; basal third without transverse unpigmented line; ventral surfaces with few uniseriate robust macrosetae and some fine long microsetae. Connective (Fig. 17), in dorsal view, Tshaped; apex fused with aedeagus preatrium. Styles (Figs. 17, 18), in dorsal view, with apical fourth wide and appearing bifid due to elongate and robust preapical lobe; mesal rami acute and curved outwards, bearing robust spine, preapical region sculptured; lateral rami with few fine microsetae. Aedeagus (Figs. 19, 20), in lateral view, with dorsal apodeme well developed; shaft tubular and short, curved dorsally; apex with pair of long and acute spiniform processes, which are divergent from each other and directed anteroventrally.

Remarks. Metacephalus adustus sp. nov. is similar to M. facetus comb. nov. in the aspect of the apical aedeagus processes, which are long and divergent in caudal view. However, it can be distinguished from the latter species and other Metacephalus species because of its: (1) male pygofer (Fig. 15) without processes and with apex obliquely truncate; (2) aedeagal shaft (Fig. 19) curved dorsally, without a dorsal preapical broad process, and apical processes directed anteroventrally; and (3) unique color pattern of head and thorax (Figs. 11–13).

Etymology. The species epithet is an allusion to the mostly brown ( adustus L. = brown) coloration of the dorsal habitus of this species, lacking the distinct orange maculae common in other species of Metacephalus .

Holotype. BRAZIL: Amazonas: Ipixuna, Rio Liberdade , Comunidade São Vicente no Estirão da Preta, 07°21’47”S 071°52’07”W 175m, May 11–15 2011, Malaise, Cavichioli, Gonçalves, Rafael, Takiya et al., male, INPA.

Paratype. BRAZIL: Acre: Porto Acre, Humaitá, June 15 – July 0 2 1992, Gorayeb , Pena , Henriques , Edmar , Malaise trap, 1 male, INPA.

Figures

FIGURE 2. Metacephalus adustus Souza, Takiya & Felix sp. nov. 11, dorsal habitus; 12, lateral habitus; 13, face; 14, crown, pronotum, and mesonotum; 15 – 20, male genitalia: 15, genital chamber, lateral view; 16, valve and subgenital plate, ventral view; 17, connective and right style, dorsal view; 18, right style, lateral view; 19, aedeagus, lateral view; 20, aedeagus, caudal view. Scale bars: D, 0.5 mm; others, 0.25 mm.