The Austral Predator Katydid-new species of Megatympanon Piza, 1958 (Orthoptera: Tettigoniidae: Listroscelidinae: Terpandrini) from the Brazilian Atlantic Rainforest Author Mendes, Diego Matheus De Mello 0000-0001-5037-9686 diego.mello.mendes@gmail.com Author Sobral, Rafael 0000-0001-5037-9686 Instituto Nacional de Pesquisas da Amazônia, INPA, Programa de Pós-graduação em Entomologia, Caixa Postal 2223, 69080 - 971, Manaus, Amazonas, Brazil. rafaelsobralves @ gmail. com; https: // orcid. org / 0000 - 0002 - 4975 - 1193 diego.mello.mendes@gmail.com Author Neto, Alberto Moreira Da Silva 0000-0001-5037-9686 Instituto Nacional de Pesquisas da Amazônia, INPA, Programa de Pós-graduação em Entomologia, Caixa Postal 2223, 69080 - 971, Manaus, Amazonas, Brazil. rafaelsobralves @ gmail. com; https: // orcid. org / 0000 - 0002 - 4975 - 1193 & Universidade Estadual de Feira de Santana, 44036 - 900, Feira de Santana, Bahia, Brazil. diego.mello.mendes@gmail.com text Zootaxa 2023 2023-04-06 5263 3 430 440 http://dx.doi.org/10.11646/zootaxa.5263.3.7 journal article 10.11646/zootaxa.5263.3.7 1175-5326 7804383 5BE2011B-8F58-415C-B788-EBFB8E5B6DB1 Megatympanon speculatum Piza, 1958 Figures 1–4 and 9 Megatympanon speculatum Piza, 1958 ; 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 ). Tegmina narrow with rounded apex ( Fig. 3 ); total length of tegmina almost two times longer than body, in lateral view ( Fig. 2A ). Vein MA with one branch reaching apex of tegmina ( Fig. 3 ). Cercus curved inwards in dorsal view, conical in lateral view, apically with tip small and curved inward ( Figs. 2I–J ). Subgenital plate trapezoidal, laterally concave and posteriorly projected with medial notch narrow and Y-shaped ( Figs. 2I–J ). 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 ); Dorsal-lateral suture slightly curved ( Figs. 2D–E ). Furcal suture bifurcated, V-shaped and concolorous with pronotal disc ( Fig. 2E ). Wings . Tegmina narrow with rounded apex ( Fig. 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 ). 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 ). Total length of left stridulatory file 4 mm , greater vein width of 0.5 mm and a total of 68 teeth ( Fig. 4A ). 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 ). Total length file of 4.3 mm, widest vein of 0.5 mm and total of 74 teeth ( Figs. 4B ). FIGURE 2. Megatympanon speculatum , male. A: habitus , dorsal view; B: head, frontal view; C: head and pronotum, dorsal view; D: head and pronotum, lateral view; E: Thoracic sternites, ventral view; F: foreleg, lateral view; G: midleg, lateral view; H: stridulatory area, dorsal view; I–K: Terminalia in ventral, dorsal and lateral view respectively. Abbreviations: Mes: mesobasisternum; Met: metabasisternum; Cer: cerci; Sty: styli; Pl: subgenital plate. FIGURE 3. Megatympanon speculatum , right tegmina of male in dorsal view. Abbreviations: AP: Posterior anal vein; AA: anterior anal vein; CuA: anterior cubital vein; CuP: posterior cubital vein; MA: anterior median vein; MP: posterior median vein; R: radial vein; Sc: subcostal vein. FIGURE 4. Megatympanon speculatum , stridulatory file of male. A: left file; B: right file. 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 ). Subgenital plate trapezoidal, laterally concave and posteriorly projected with medial notch narrow and Y-shaped ( Figs. 2I–K ). Stylus short and triangular ( Figs. 2I–K ). Geographical records. Brazil : São Paulo , Minas Gerais (new record), Rio de Janeiro and Espírito Santo (new record) ( Fig. 9 ) . Material examined. BRASIL , São Paulo , Salesópolis , Est. Biol. Boracéria , 25.ii.1963 , M. Werner & H. Reichardt leg . / Megatympanon speculatum Piza det. / MZSP 5356 (1J MZSP ) ; Idem , 850m , 24.ii.1961 , luz, Rabello leg. / Megatympanon speculatum Piza det. / MZSP 5354 (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 (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.