Escutellum and process of I urotergit of R. marabaensis sp. n. (A), R. prolixus (B), R. robustus (C). pr: pronotum; sc: escutelum; sb: semi- circular base; sg: glabrous space; cd: central depression; le: lateral edge; ap: apex of escutelum; pu: process of I urotergit; tg: transverse groove; fr: fringe.