Illustrated guide to Pentatominae (Hemiptera: Pentatomidae) species associated with the four main grain crops in Rio Grande do Sul state, Brazil Author Barros, Lurdiana D. Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. Author Paim, Marcelo R. 0000-0003-2387-933X Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & marceloreginatop @ gmail. com; https: // orcid. org / 0000 - 0003 - 2387 - 933 X marceloreginatop@gmail.com Author Krein, Verônica 0000-0001-8106-2411 Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & vero. krein @ hotmail. com; https: // orcid. org / 0000 - 0001 - 8106 - 2411 vero.krein@hotmail.com Author Carabajal, Victor 0000-0001-6794-1022 Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & victorqcarabajal @ gmail. com; https: // orcid. org / 0000 - 0001 - 6794 - 1022 victorqcarabajal@gmail.com Author Brandão, Marcela N. 0000-0002-2918-788X Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & marcela. n. brandao @ gmail. com; https: // orcid. org / 0000 - 0002 - 2918 - 788 X marcela.n.brandao@gmail.com Author Bernardes, Paula De O. 0000-0001-8841-335X Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & paulabernardes 1616 @ gmail. com; https: // orcid. org / 0000 - 0001 - 8841 - 335 X paulabernardes1616@gmail.com Author Lindner, Mariana F. 0000-0002-4879-8221 Laboratory of Systematic Entomology, Department of Zoology, Institute of Biosciences, Universidade Federal do Rio Grande do Sul (UFRGS). Av. Bento Gonçalves 9500, CEP 91509 - 900, Porto Alegre, RS, Brazil. & mflindner @ hotmail. com; https: // orcid. org / 0000 - 0002 - 4879 - 8221 mflindner@hotmail.com text Zootaxa 2021 2021-04-14 4958 1 430 478 journal article 7221 10.11646/zootaxa.4958.1.27 7336298c-86ce-40e7-bab5-e75b0eddfdaa 1175-5326 4692176 303D300E-C17B-407C-A63B-53F906C5D825 Oebalus poecilus ( Dallas, 1851 ) ( Figs 96–97 ) Mormidea poecila Dallas, 1851: 55 . Oebalus rufescens Haglund, 1868 . Mormidea ( Mormidea ) exigua Berg, 1891: 239 . Mormidea ( Mormidea ) poecila : Pennington, 1920: 7 . Solubea poecila : Sailer, 1944: 121 . Oebalus poecilus : Quintanilla et al ., 1976: 125 . Material studied. Eldorado do Sul : 1♂ , Fazenda Minuano , 16.VIII.1989 , Aner, U. leg. ( UFRG ) . Guaíba : 2♂ , Km 9, BR 116, 08.XI.1985 , M. C. Del Vecchio leg., J. Grazia det. ( UFRG ) . Tapes : 1♂ , XI.1963 , M. Becker det. 1967 ( UFRG ) . Rio Grande : 2♂ , Estação Ecológica do Taim , 17.III.1982 , J. Grazia leg. ( UFRG ) . Diagnostic features. Body elongate, dorsal surface ferruginous to dark castaneous, with one pair of pale yellow callosities on pronotum, three on scutellum and one at the apex of corium radial vein ( Fig. 96 ). Mandibular plates subequal to clypeus and rounded apically. Pronotum sloping. Anterolateral margins of pronotum concave. Humeral angles with variable development, from weakly produced to forming an acute spine, directed laterally ( Fig. 96 ). Body length: 7.00–10.00 mm. Recorded host plants. Canola ( Bianchi et al . 2019 ), rice, soybean and wheat ( Grazia 1977 ; Link & Grazia 1987 ; Kishino & Alves 1994 ; Panizzi 2008a ). FIGURES 96–97. Oebalus poecilus . 96: Dorsal view, scale bar = 1.0 mm. 97: Distribution within Rio Grande do Sul. Distribution in Rio Grande do Sul . Eldorado do Sul, Guaíba, Passo Fundo, Pelotas, Rio Grande, Santa Maria and Tapes ( Fig. 97 ). Comments. This species is known as the small rice stink bug. Comparisons between this species and O. ypsilongriseus are written in the latter’s comments section.