Megatympanon speculatum Piza, 1958

Megatympanon speculatum Piza, 1958 View in CoL

Figures 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 and 9 View FIGURE 9

Megatympanon speculatum Piza, 1958 View in CoL ; Riek, 1976; Paschoal & Barros, 1977; Rentz, 2001; Chamorro-Rengifo & Braun, 2010; Chamorro-Rengifo, Braun & Lopes-Andrade, 2014; Fialho et. al, 2014; Cigliano et. al, 2023.

Diagnosis. Pronotal disc posteriorly forming a round projection with big black triangular spot, in dorsal view ( Fig. 2C View FIGURE 2 ). Tegmina narrow with rounded apex ( Fig. 3 View FIGURE 3 ); total length of tegmina almost two times longer than body, in lateral view ( Fig. 2A View FIGURE 2 ). Vein MA with one branch reaching apex of tegmina ( Fig. 3 View FIGURE 3 ). Cercus curved inwards in dorsal view, conical in lateral view, apically with tip small and curved inward ( Figs. 2I–J View FIGURE 2 ). Subgenital plate trapezoidal, laterally concave and posteriorly projected with medial notch narrow and Y-shaped ( Figs. 2I–J View FIGURE 2 ).

Description. Male. We include here only characteristics that were not used in the original description made by Piza (1958) or in the redescription by Fialho et al. (2014).

Thorax. Pronotal disc rectangular, without carina, anteriorly straight, slightly convex laterally and posteriorly, forming a round projection with big black triangular spot, in dorsal view ( Fig. 2C View FIGURE 2 ); Dorsal-lateral suture slightly curved ( Figs. 2D–E View FIGURE 2 ). Furcal suture bifurcated, V-shaped and concolorous with pronotal disc ( Fig. 2E View FIGURE 2 ).

Wings. Tegmina narrow with rounded apex ( Fig. 3 View FIGURE 3 ). Vein R slightly sinuous anteriorly and curved posteriorly, with many branches almost straight and parallel reaching anterior margin of tegmina; main branch of Vein R reaching apex of tegmina. Vein MA with one branch, anteriorly straight and posteriorly slightly curved, reaching apex of tegmina; Vein MP with four bifurcations at main branch and seven branches reaching posterior margin of tegmina. Vein CuA narrow, anteriorly curved, surrounding area of second mirror cell, medially straight and posteriorly curved; vein CuA with branches slightly curved, parallel and turned to apex, except by first branch curved to base of tegmina; vein CuP curved, wide, surrounding posterior margin of first mirror cell. Vein AA narrow, surrounding area of first mirror cell. Vein Sc sinuous with several short ramifications ( Fig. 3 View FIGURE 3 ).

Left stridulatory file curved with apex straight and narrow; apical teeth short and close to each other; medial and basal teeth long and wide ( Fig. 4A View FIGURE 4 ). Total length of left stridulatory file 4 mm, greater vein width of 0.5 mm and a total of 68 teeth ( Fig. 4A View FIGURE 4 ). Right stridulatory file sinuous with apex straight and narrowing gradually; apical teeth short and close to each other; medial teeth big and sparse; basal teeth similar to medial teeth but shorter and closer to each other ( Fig. 4B View FIGURE 4 ). Total length file of 4.3 mm, widest vein of 0.5 mm and total of 74 teeth ( Figs. 4B View FIGURE 4 ).

Abdomen. Cercus curved inwards in dorsal view, conical in lateral view, apically with tip small and curved inward; apex of cercus exceeding base of stylus; cercus with several short bristles ( Figs. 2I–K View FIGURE 2 ). Subgenital plate trapezoidal, laterally concave and posteriorly projected with medial notch narrow and Y-shaped ( Figs. 2I–K View FIGURE 2 ). Stylus short and triangular ( Figs. 2I–K View FIGURE 2 ).

Geographical records. Brazil: São Paulo, Minas Gerais (new record), Rio de Janeiro and Espírito Santo (new record) ( Fig. 9 View FIGURE 9 ).

Material examined. BRASIL, São Paulo, Salesópolis, Est. Biol. Boracéria , 25.ii.1963, M. Werner & H. Reichardt leg. / Megatympanon speculatum Piza det. / MZSP 5356 View Materials (1J MZSP) ; Idem , 850m, 24.ii.1961, luz, Rabello leg. / Megatympanon speculatum Piza det. / MZSP 5354 View Materials (1J MZSP) ; Idem, Boracéia , 18-24.iii. 1989, 850m alt., A. Mesa, A. Van der Laan, H. Costa, L. Nadai, E. Zeffa & M.C. Bianchi leg. / Coleção Alejo Mesa / MZSP 6063 View Materials (1J MZSP).

Measurements (mm). J: TL: 36,1–34,5; TegL: 67,4 –66,7; TegH: 14,1–13,4; WF: 6,8–5,7; PL: 12,0–11,4; PH: 6,4–6,3; FF: 12,9–12,2; FT: 12,6–12,0; MF: 12,4–12,0; MT: 13,4–12,9; HF: 33,6–33,3; HT: 35,6–33,5; Lplac: 5,7–4,8; LC: 3,8–3,5.