Exetasis teresensis, Cordeiro, 2025

Exetasis teresensis sp. nov.

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( Figs. 1A–D View FIGURES 1 and 2 View FIGURE 2 )

Diagnosis. Female: antennal flagellum yellow; scutum with yellow lateral margins and three large longitudinal black areas that cover most of scutum; wing microtrichia on most of the membrane except on anal region and cells br and bm; R 4+5, M 1 and M 2 reaching wing margin; M 3 fused to M 4 before wing margin; CuA fused with CuP right before wing margin; abdominal tergite II yellow with anteromedian brown spot, tergite III brown with posterolateral yellow spots.

Description. Female: Body length: 6.95mm; wing length: 7mm. Head. Antenna little longer than head hight; scape about 1.5 times as long as pedicel; pedicel short, spherical; flagellum yellow, cylindrical and narrowed at apex, bearing two terminal setae; frons black and small; ocellar tubercle reduced; two ocelli present; mouthparts lacking. Thorax. Pleuron brown, slightly lighter dorsally, scutum mostly yellow on margins with three large black virtually fused stripes covering most of scutum, scutellum yellow; legs with light brown tegumen and dark brown setae; calypter light brown. Wing. Wing membrane light brown, without conspicuous markings, little darker along costal margin on distal half of cells c and sc; microtrichia present on all cells, except br and bm and anal region; subcosta ending beyond middle of wing; R 4+5, M 1 and M 2 reaching wing margin; M 3 fused to M 4 before wing margin; CuA fused with CuP right before wing margin; A 1 very short. Abdomen. Globose; tergite II yellow with anteromedian brown spot, tergite III brown with posterolateral yellow spots, other tergites brown; sternites light brown. Terminalia. Tergite IX semicircular, lateroposteriorly widened; sternite VIII presenting numerous black spines on posterior margin; hypoproct barely visible, almost fused with cerci; cercus brown with yellow base ventrally, and yellow pilosity.

Male: unknown.

Etymology. The specific name teresensis is a reference to the type locality.

Type material. Holotype female, BRAZIL: Espírito Santo: Santa Teresa, Est.[ação] Biol.[ógica de] Santa Lúcia [ -19.965053 -40.537459], 28.xi.1996, R. Ribeiro col. ( MBML 1878 ) GoogleMaps

Distribution. Only known from the type locality, a protected area composed of ombrophilous forest formation in the municipality of Santa Teresa, state of Espírito Santo, Brazil.

Comments. Exetasis teresensis sp. nov., E. jujuyensis Gillung and E. calida Wiedemann , are the only known species of Exetasis characterized by an apical fusion of veins M 3 and M 4. However, in E. jujuyensis and E. calida , these veins bifurcate from M 3+4 distal to m-cu, whereas in the new species, they bifurcate just before m-cu, with m-cu arising from M 4. Additionally, E. teresensis sp. nov. can be distinguished from E. jujuyensis and E. calida by a complete M 2, by the position of r-m arising from the radial fork and by the color pattern on the thoracic and abdominal tergites.

The apical fusion of veins M 3 and M 4 is reported here for a female specimen of E. eickstedtae Schlinger (see below). However, this species can be separated from E. teresensis sp. nov. by the color pattern of abdominal tergites, color of the antennal flagellum in the female (black in E. eickstedtae ) and color pattern on the abdominal tergites II and III, which are predominantly dark-brown with orangish-brown lateral areas in E. eickstedtae .

In the identification key of Barneche et al. (2013), Exetasis teresensis sp. nov. is grouped with E. jujuyensis . Nevertheless, in addition to the aforementioned differences, these species can also be separated by the color of the antennal flagellum in the female, which is yellow in E. teresensis and black in E. jujuyensis . Notably, E. teresensis sp. nov. is the only known species within the genus in which the female flagellum is entirely yellow. In contrast, the female flagellum of E. brasiliensis and E. tumens is, at least partially dark ( Walker 1852, Carrera 1946).Additionally, E. longicornis can be separated from E. teresensis sp. nov. by the presence of an open cell m 3, with vein M 3 ending free on wing membrane, a feature it shares with E. brasiliensis and E. tumens .