Viadana (Viadana) rostrata, Gorochov, 2018

Viadana (Viadana) rostrata View in CoL sp. nov.

( Figs 61–65 View Figs 56–65 , 72–77 View Figs 66–77 )

Etymology. This species name originates from “rostrum”, a morphological term from Latin word meaning beak or nose.

Type material. Holotype – male, PERU: Junin Department, Satipo Prov. , Rio Tambo Distr. , 6 km N of Pichiguia Vill., protected area “Reserva Comunal Ashaninka”, 11.358244°S, 74.0320473°W, ~ 500 m, primary forest, at light, 14–23 November 2017, A. Gorochov, G. Irisov. GoogleMaps

Description. Male (holotype). Body colouration yellowish with greenish tinge (light greenish in living condition), but eyes yellowish rose, wings with transparent parts as in V. (P.) ashaninka sp. nov., cerci with slightly darkened (light brown) small distomedial area ( Figs 61, 62, 64, 65 View Figs 56–65 , 72–75 View Figs 66–77 ). Rostrum of head with upper tubercle slightly widened in apical part, narrowed in subapical part and having longitudinal dorsomedian groove running from low lateral keels at base of above-mentioned tubercle to almost apical part of this tubercle ( Fig. 63 View Figs 56–65 ); pronotum with shallowly notched anterior edge of disc, with rounded posterior edge of disc and with almost keel-like borders between disc and lateral lobes ( Fig. 62 View Figs 56–65 ); legs typical of this subgenus; tegmina rather long and wide, with majority of Sc branches more or less parallel to majority of oblique branches situated between radial area and anal tegminal edge (however, these Sc branches partly irregular; Fig. 64 View Figs 56–65 ), and with stridulatory appartatus as in Fig. 61 View Figs 56–65 ; hind wings with distal half of costal part as in Fig. 65 View Figs 56–65 ; last abdominal tergite roundly truncate at apex; epiproct similar to that of V. (P.) ashaninka sp. nov. but slightly shorter and not spine-like in distal part; paraprocts small and more or less rounded; cerci rather short, moderately thick in proximal half, clearly thinner in subdistal part, barely thicker (than subdistal part) in distal part which strongly curved upwards and with characteristic medial convexity (small rounded projection) near bending point ( Figs 72–75 View Figs 66–77 ); genital plate slightly longer than in V. (P.) ashaninka sp. nov., narrower in distal part, and with less deep posteromedian notch and narrower apical lobules around it ( Fig. 74 View Figs 66–77 ); genitalia with sclerotized and semisclerotized parts more or less similar to those of subgenus Arcuadana Gorochov et Cadena-Castañeda, 2015 ( Figs 76, 77 View Figs 66–77 ).

Female unknown.

Length (mm). Body 17.3; body with wings 33.0; pronotum 4.4; tegmina 27.0; hind femora 13.6.

Comparison. The new species is most similar to V. (V.) bulbosa Gorochov, 2015 in the shape of male cerci, but the upper rostral tubercle has a wider apical part not separated from its basal part by any dorsal concavity, the male tegmen lacks a longitudinal row from distinct crossveins (connected subdistal parts of oblique branches situated between R and anal tegminal edge) as well as darkened marks near these crossveins, the distal parts of male cerci are not inflated in the profile, and the male genitalia have their sclerotized parts different in the shape ( Fig. 76 View Figs 66–77 ; Gorochov 2015: fig. 25). From all the other species of this subgenus with known males, the new species differs in the above-mentioned structure of male cerci and male genitalia, and from six species of Viadana s. str. with unknown males, in the tegmina clearly narrower [from V. (V.) amboro Gorochov, 2015 and V. (V.) piracicabae Piza, 1969 ] or with less transverse distal halves of oblique branches situated between R and anal tegminal edge [from V. (V.) transversa Walker, 1869 , V. (V.) brasiliensis ( Brunner-Wattenwyl, 1878 and V. (V.) aguarico Gorochov, 2015 ], or in the apical part of upper rostral tubercle clearly wider [from V. (V.) lobata ( Brunner-Wattenwyl, 1878) ].