A new genus and two new species of Platyarthridae Verhoeff, 1949 (Crustacea: Isopoda: Oniscidea) from Brazil Author Bezerra-Pereira, Carlos Anderson Soares Programa de Pós-Graduação em Biodiversidade e Conservação (PPGBC), Universidade Federal do Piauí, Campus Amílcar Ferreira Sobral, Floriano, Piauí, Brazil. Author Grangeiro, Daniela Correia 0000-0001-5457-1616 Universidade Estadual do Piauí, Campus Professor Barros Araújo, Laboratório de Biologia, Picos, Piauí, Brazil. & danielagrangeiro @ pcs. uespi. br; https: // orcid. org / 0000 - 0001 - 5457 - 1616 danielagrangeiro@pcs.uespi.br Author Lima, Lucas Ramos Costa 0000-0001-5943-3351 Programa de Pós-Graduação em Biodiversidade e Conservação (PPGBC), Universidade Federal do Piauí, Campus Amílcar Ferreira Sobral, Floriano, Piauí, Brazil. & Universidade Estadual do Piauí, Campus Heróis do Jenipapo, Laboratório de Zoologia, Campo Maior, Piauí, Brazil. & lucaslima _ 86 @ hotmail. com; https: // orcid. org / 0000 - 0001 - 5943 - 3351 lucaslima_86@hotmail.com text Zootaxa 2023 2023-08-09 5325 3 436 450 http://dx.doi.org/10.11646/zootaxa.5325.3.8 journal article 10.11646/zootaxa.5325.3.8 1175-5326 8243564 A922DD99-07AC-47CA-A815-34A21936B6CE Key to the genera of Platyarthridae Verhoeff, 1949 1 Granular tegument or with conical tubercles................................................................ 2 - Smooth tegument..................................................................................... 3 2 Granular tegument with conical tubercles....................................................... Echinochaetus - Granular tegument, without conical tubercles.......................................................... Gerufa 3 Back covered with fan-shaped or ovoid setae............................................................... 4 - Back covered with spear-point setae........................................................... Lanceochaetus 4 Respiratory areas present in some species............................................................ Niambia - Respiratory areas absent................................................................................ 5 5 Frontal line present......................................................................... Papuasoniscus - Frontal line absent or interrupted......................................................................... 6 6 Fifth article of the antennal peduncle robust....................................................... Platyarthrus - Fifth article of the antennal peduncle is similar to the others.................................................... 7 7 Cephalothorax compressed anteroposteriorly and very wide......................................... Cephaloniscus - Cephalothorax not compressed........................................................................... 8 8 First maxilla with absence of pectinate teeth........................................................ Trichorhina - First maxilla with pectinate teeth....................................................... Paratrichorhina n. gen.