New species and records of Caenidae Newman, 1853 (Insecta: Ephemeroptera) from Northeastern Brazil Author Nascimento, Stênio R. S. Instituto Nacional de Pesquisas da Amazônia-INPA, Laboratório de Diptera, Manaus, Amazonas, Brazil. Author Rodrigues, Jackson A. O. 0000-0002-3016-9902 Universidade Estadual do Piauí-UESPI, Campus Heróis do Jenipapo, Laboratório de Zoologia, Campo Maior, Piauí, Brazil. jackson 11505 @ hotmail. com; https: // orcid. org / 0000 - 0002 - 3016 - 9902 jackson11505@hotmail.com Author Ale-Rocha, Rosaly 0000-0001-9874-9770 Instituto Nacional de Pesquisas da Amazônia-INPA, Laboratório de Diptera, Manaus, Amazonas, Brazil. & alerocha @ inpa. gov. br; https: // orcid. org / 0000 - 0001 - 9874 - 9770 alerocha@inpa.gov.br Author Lima, Lucas R. C. 0000-0001-5943-3351 Universidade Estadual do Piauí-UESPI, Campus Heróis do Jenipapo, Laboratório de Zoologia, Campo Maior, Piauí, Brazil. jackson 11505 @ hotmail. com; https: // orcid. org / 0000 - 0002 - 3016 - 9902 & limalrc @ cpm. uespi. br; https: // orcid. org / 0000 - 0001 - 5943 - 3351 limalrc@cpm.uespi.br text Zootaxa 2022 2022-05-03 5133 1 110 122 journal article 55706 10.11646/zootaxa.5133.1.5 19f4dbec-5385-4db3-b209-934583f39567 1175-5326 6521359 54E7DF54-B8F1-48C5-A488-F60601134790 Brasilocaenis elidioi ( Lima, Molineri, Pinheiro & Salles, 2016 ) ( Figs 6C, D ) Caenis sp. Angeli et al. 2015: 200 (adults); Lima et al. 2016b: 215 (adults and nymphs). Caenis elidioi Lima et al. 2016a: 117 (adults, nymph and eggs); Lima & Boldrini, 2017: 286 (adult). Brasilocaenis elidioi , Lima et al. 2019: 90 . Distribution . Brazil : states of Bahia , Ceará , Espírito Santo , Mato Grosso , Minas Gerais , Paraíba , Pernambuco and Roraima . New record: Piauí State . Material examined . 25 ♂ imagos ( light trap ), Brazil , Piauí State , Batalha municipality, Cachoeira do Urubu , S3°54’47.9” , W42°6’47.70” , 80 m a.s.l. 07.ix.2018 Lima, L. R . C, Rodrigues, J.A.O. cols. ( CEHJ ) . 36 ♂ and nine ♀ imagos ( light trap ), Brazil , Piauí State , Piripiri municipality, Cachoeira do Bota-Fora , S4°12’51.1” , W41°40’01.7” , 162 m a.s.l. 15-16.xii.2018 Lima, L. R .C. col. ( CEHJ ). Comments. Brasilocaenis elidioi can be characterized by the presence of pointed forceps, abruptly sharpening distally, and forming a long tip at the apex, and penis dorsally and laterally protruding (adapted from Lima et al . 2016a ).