Acusana adunca, Domahovski & Cavichioli, 2019

Domahovski, Alexandre Cruz & Cavichioli, Rodney Ramiro, 2019, Acusana DeLong (Hemiptera: Cicadellidae: Gyponini), a genus not previously recorded in Brazil: description of four new species for the Brazilian fauna, Zootaxa 4571 (4), pp. 531-543 : 532-535

Acusana adunca sp. nov.

Figs 1 ¯22, 73

Diagnosis. Style (Fig. 12) with blade tapered toward apex, ventral margin not expanded ventrally. Aedeagus (Figs 13, 14) apical processes half as long as aedeagus, curved posterolaterally.

Description. Length 8.1¯ 8.5mm (male), 8.5¯ 8.7mm (female). Head ( Fig. 1 ), in dorsal view, with median length of crown longer than half interocular width; crown with anterior margin broadly rounded; transocular width of head slightly less than nine-tenths humeral width of pronotum. Ocelli closer to median line than to eye and slightly closer to anterior than posterior margin of crown. Head (Fig. 2), in frontal view, with frons longer than wide, flat, not excavated below anterior margin of crown; antennal ledge continuous to lateral margin of crown; frontogenal suture extending to antennal ledges; maxillary plates produced ventrally as far as clypeus apex; clypeus ca. 1.4 times longer than wide, lateral margins slightly divergent towards apex, apex slightly emarginated. Head (Fig. 3), in lateral view, with striae near eye margin and three carinae on mid-portion. Pronotum ( Fig. 1 ), in dorsal view, with transverse striae on disc and posterior third; lateral margins as long as eye length, convergent anterad; posterior margin slightly excavated; in lateral view (Fig. 3) weakly declivous; head and pronotum in continuous slope. Mesonotum (Fig. 3), in dorsal view, slightly wider than long. Forewing (Fig. 4) without extra crossveins; internal discal cell long, almost as long as external discal cell; first apical cell narrow; appendix very developed, wider than first apical cell maximum width, bordering first and second apical cells; apex rounded. Profemur ca. five times longer than maximum high; AV row formed by 3-4 setae, restricted to basal half; PV row formed by 2 setae, restricted to distal half. Protibia, in cross-section, circular; AV row formed by short and thin setae in basal half and 4–5 thick and long setae in distal half; AD row formed by very short setae from base to apex and 3–4 longer intercalary setae in the mid-portion; PD row formed by 4–5 long setae; PV row developed, formed by very short setae from base to apex and four long setae in the distal portion. Hind leg with femoral setal formula 2:2:1; metatibia PD, AD and AV rows with 19-21, 12-13 and 12-13 macrosetae respectively; AD row without intercalary setae between macrosetae; PV row with setae of apical half long, thin and homogeneous in length and thickness, ending with a thick seta, succeeded by two short and thin setae; first tarsomere with outer row of setae absent and inner row formed by 4-5 very short setae, pecten with 4 platellae flanked by tapered lateral setae; second tarsomere pecten with 2 platellae flanked by 2 tapered lateral setae on inner and 1 on external corner. Other characteristics as in generic description.

Coloration. Head and thorax ( Figs 1 , 73 ) golden-yellow. Crown ( Fig. 1 ) with anterior margin light-yellow. Face (Fig. 2) gradually lighter towards ventral margin. Pronotum ( Figs 1 , 3) with lateral margins light-yellow. Forewing (Fig. 4) with costal margin yellow; first, posterior half of second and third and apex of fourth apical cells gray; appendix gray with anterior portion black. Legs golden-yellow. Abdomen red dorsally and yellow ventrally.

Male terminalia. Sternite VIII (Fig. 5), in ventral view, rectangular, 1.8 times wider than long; posterolateral margins truncated; posterior margin straight. Valve (Fig. 6), in ventral view, 1.9 times wider than long; anterior margin emarginated; lateral margin slightly excavated, convergent posterad; posterior margin excavated. Pygofer (Fig. 7), in lateral view, short, 1.4 times longer than maximum height; ventral margin rounded; apex tapered; macrosetae dispersed on posterodorsal quadrant; apex in dorsal view (Fig. 8), with rounded protrusion. Subgenital plate, in lateral view (Fig. 7), not produced posteriorly as far as pygofer apex; in ventral view (Fig. 9), ligulate, 3.5 times longer than wide, wider near midlength and tapered toward apex; small setae on ventral surface, near external margin; apex rounded. Connective (Fig. 10) in posterior view, as wide as long; stalk elongate, wider apically; in lateral view (Fig. 13) slightly curved ventrally; with translucent keel dorsally, moderately developed. Style, in dorsal view (Fig. 11), outer lobe elongated, rounded, with setae on inner surface; in lateral view (Fig. 12), blade tapered toward apex; ventral margin serrated medially; apex acute, slightly curved dorsally. Aedeagus (Figs 13, 14) with preatrium developed; shaft directed dorsally, straight and flattened laterally; shaft apex with pair of apical processes with half length of aedeagus, curved posterolaterally. Other characteristics as in generic description.

Female terminalia. Sternite VII ( Fig. 15 ) 1.7 times wider than long; lateral angles rounded, produced posterad and flanking broad, shallow V-shaped notch with very small projection in middle. Internal sternite VIII membranous. Pygofer (Fig. 16) ca. two times longer than maximum height; apex irregularly rounded; macrosetae dispersed on posterior half, larger macrosetae grouped on median portion, forming longitudinal line and dispersed near ventral margin. First valvifer (Fig. 17) with shape of right triangle, two times higher than long; margins approximately straight. First valvula (Fig. 17) wider basally, slightly curved dorsally, 7.5 times longer than high; apex (Fig. 18) abruptly tapered and acute. Second valvula (Fig. 19) slightly curved dorsally, ca. 4.5 times longer than high; distinctly higher on apical third; apex tapered and acute. Second valvifer (Fig. 22) ca. 2.5 times higher than long. Gonoplac (Fig. 22) 3.3 times longer than high; dorsoapical margin oblique and straight; ventral margin slightly rounded, with microsetae; apex rounded. Other characteristics as in generic description.

Material examined. Holotype male: " Brasil, MT, Cláudia , Fazen-\ da, Continental, 11.5841°S \ 55.3003°W, 365m, light trap,\ 17-19.vi.2017, RR Cavichioli\ & AC Domahovski" (DZUP). Paratypes: 2³: same as holotype ( DZUP, DZRJ) ; 4³, 2♀: " Brasil, MT, Nova Ubiratã,\ E.S.E.C. Rio Ronuro ,\ 13.1122°S, 54.4436°W, 330m \ light trap, 11-16.vi.2017, RR\ Cavichioli & AC Domahovski" ( DZUP) ; 1♀: " Brasil, MT, Novo Mundo, Pq. \ Est.do Cristalino , 09.4517°S,\ 55.8396°W, 240m, light trap,\ 21-25.vi.2017, RR Cavichioli\ & AC Domahovski" ( DZUP) ; 4³, 4♀: " Brasil, Mato Grosso \ Sinop \ X.1976 \ M. Alvarenga leg." (2♂, 2♀, DZUP; 2♂, 2♀, DZRJ); 7³, 13 ♀: " Brasil, Mato Grosso \ Sinop \ X.1975 \ M. Alvarenga leg." (5♂, 11♀, DZUP; 2♂, 2♀, MZSP); 1³: " Brasil, Mato \ Grosso Vila Vera \ X.1973 \ M. Alvarenga leg." ( DZUP) ; 6³, 5♀: "Sinop—M. Grosso \ Brasil—X/1975\ M. Alvarenga " (4♂, 3♀, DZUP; 2♂, 2♀, CZMA); 1³ , 2♀: " Sinop—Mato Grosso \ BR X.1975 \ M. Alvarenga leg." ( DZUP) ; 1♀: "Jacaré- P.N. Xingu \ MT-Brasil- XI/1961 \ Alvarenga-Werner" ( DZUP) .

Etymology. The new species epithet is derived from the Latin word “aduncum” meaning curved. It refers to the strongly curved and hook-shaped apical processes of the aedeagus. Notes. Acusana adunca sp. nov. is most similar to Acusana aurella DeLong & Freytag, 1966 from Panamá, in having the shape of the subgenital plate short and ligulate, the style blade tapered apically with ventral margin not expanded and the aedeagus with apical processes half as long as its total length. However, the new species can be easily separated by the taller style, higher near blade base and the posterolaterally curved aedeagal processes. Several specimens from different localities were dissected but the shape of the aedeagal apical processes was consistent.

Figures

FIGURES 1─14. Acusana adunca sp. nov., male holotype. 1, head and thorax, dorsal view. 2, head and thorax, ventral view. 3, head and thorax, lateral view. 4, forewing. 5–14, male terminalia: 5, sternite VIII, ventral view. 6, valve, ventral view. 7, pygofer, valve, and subgenital plate, lateral view. 8, apex of pygofer, dorsal view. 9, subgenital plate, ventral view. 10, connective, posterior view. 11, style, dorsal view. 12, style, lateral view. 13, connective and aedeagus, lateral view. 14, aedeagus, posterior view. Scale bars: 1–3 = 1.0mm, 4 = 2.0mm, 5–9, 11, 12 = 0.5mm, 10, 13, 14 = 0.25mm.

FIGURES 15─22. Acusana adunca sp. nov., female paratype. 15, sternite VII, ventral view. 16, pygofer, lateral view. 17, first valvifer and first valvula, lateral view. 18, apex of first valvula, lateral view. 19, second valvula, lateral view. 20, teeth of dorsal margin, lateral view. 21, teeth of ventral margin, lateral view. 22, second valvifer and gonoplac, lateral view. Scale bars = 0.5mm.

FIGURES 73─76. Holopypes habitus, dorsal view (up) and lateral view (down). 73, Acusana adunca sp. nov. 74, Acusana dilatata sp. nov. 75, Acusana longa sp. nov. 76, Acusana spina sp. nov. Scale bars: 2.0 mm.