Revision of the Belostoma triangulum group (Insecta: Heteroptera: Belostomatidae) Author Stefanello, Fabiano Laboratório de Biologia Comparada e Abelhas (LBCA), Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo, Avenida Bandeirantes, 3900, 14040 - 901, Ribeirão Preto, SP, Brazil. Author Ribeiro, José Ricardo Inacio 0000-0001-5035-2766 Laboratório de Estudos da Biodiversidade do Pampa (LEBIP), Universidade Federal do Pampa, Campus São Gabriel, Avenida Antônio Trilha 1847, 97300 - 162, São Gabriel, RS, Brazil. jozecaricardo @ gmail. com; https: // orcid. org / 0000 - 0001 - 5035 - 2766 Museo de La Plata, División Científica de Entomología, Paseo Del Bosque s / nº, B 1900 FWA La Plata, Buenos Aires, Argentina. jozecaricardo@gmail.com Author Estévez, Ana Lia text Zootaxa 2021 2021-04-14 4958 1 95 102 journal article 7178 10.11646/zootaxa.4958.1.8 5a347ee5-0d8e-4851-9b8e-f00f37173214 1175-5326 4693159 D9A893E4-4685-44EF-9250-43E3A48A12E1 Key to species of the Belostoma triangulum group 1 Lorogenal cleft with a conspicuous fovea ( Fig. 1B ); prosternal keel not prominent, projecting forward; dorsal arms of phallosoma wider at the base than at the apex ( Fig. 3A )....................................................... B. bachmanni - Lorogenal cleft without fovea; prosternal keel prominent ( Fig. 1A ), not projecting forward; dorsal arms of phallosoma subequal in width at the base and apex ( Fig. 3D ).......................................................... B . triangulum