Acusana dilatata, 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 : 536

Acusana dilatata sp. nov.

Figs 23 ¯36, 74

Diagnosis. Style (Fig. 34) with blade strongly expanded ventrally and rounded at apical half. Aedeagus (Figs 35, 36) with shaft straight, apical processes one quarter length of aedeagus and curved anterolaterally.

Description. Length 7.5mm (male). Head ( Fig. 23 ), in dorsal view, ocelli slightly closer to anterior than posterior margin of crown. Head (Fig. 24), in frontal view, with clypeus ca. 1.2 times longer than wide, lateral margins divergent towards apex. Head (Fig. 25), in lateral view, crown-face transition with striae near eye margin and three carinae on mid-portion. Forewing (Fig. 26) appendix very developed, wider than first apical cell maximum width. Protibia, AD row formed by only very short setae. Other characteristics as in the previous description and generic diagnosis.

Coloration. Head and thorax ( Figs 23 , 74) golden-yellow. Forewing (Fig. 26) with first, posterior half of second and third, and apex of fourth apical cells gray. Legs golden-yellow. Abdomen red dorsally and yellow ventrally. Other characteristics as described for previous species.

Male terminalia. Sternite VIII (Fig. 27), in ventral view, 1.5 times wider than long; posterolateral margins rounded; posterior margin weakly sinuate. Valve (Fig. 28), in ventral view, 1.6 times wider than long; anterior margin excavated medially; lateral margins rounded, convergent posterad; posterior margin deeply excavated. Pygofer (Fig. 29), 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. 30), with rounded protrusion. Subgenital plate, in lateral view (Fig. 29), produced posteriorly as far as pygofer apex; in ventral view (Fig. 31), 3.7 times longer than wide, slightly wider near midlength; microsetae on ventral surface, near external margin; apex subacute. Connective (Fig. 32) in posterior view, as wide as long; stalk elongate, as long as arm length; in lateral view (Fig. 35) slightly curved ventrally; with translucent keel dorsally, moderately developed. Style, in dorsal view (Fig. 33), outer lobe rounded, with setae on internal surface; in lateral view (Fig. 34), blade strongly expanded ventrally and rounded at apical half; ventral margin serrated medially; apex acute, slightly curved dorsally. Aedeagus (Figs 35, 36) with preatrium developed; shaft directed dorsally, straight and flattened laterally; shaft apex with pair of apical processes one quarter length of aedeagus, curved anterolaterally. Other characteristics as in generic description.

Female unknown.

Material examined. Holotype male: "Imperatriz, MA\ 16.VII.74 \ Exc. Dpto. Zool." (DZUP).

Etymology. The new species name is the Latin word “dilatata” meaning expanded. It refers to the ventrally expanded margin of the style blade.

Notes. Acusana dilatata sp. nov. has the aedeagus with one pair of short apical processes, directed anterolaterally as in Acusana hebeta DeLong & Freytag, 1966 from Panamá and Acusana convesta DeLong & Freytag, 1966 from British Guiana. However the new species has the aedeagal shaft, in lateral view, broad and straight in contrast to the curved and thinner aedeagus of A. convesta and A. hebeta . Acusana dilatata sp. nov. differs from all species of Acusana in having the style blade strongly expanded ventrally and rounded in the apical half.

Figures

FIGURES 23─36. Acusana dilatata sp. nov., male holotype. 23, head and thorax, dorsal view. 24, head and thorax, ventral view. 25, head and thorax, lateral view. 26, forewing. 27–36, male terminalia: 27, sternite VIII, ventral view. 28, valve, ventral view. 29, pygofer, valve, and subgenital plate, lateral view. 30, apex of pygofer, dorsal view. 31, subgenital plate, ventral view. 32, connective, posterior view. 33, style, dorsal view. 34, style, lateral view. 35, connective and aedeagus, lateral view. 36, aedeagus, posterior view. Scale bars: 23–25 = 1.0mm, 26 = 2.0mm, 27–29 = 0.5mm, 30–36 = 0.25mm.