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 irmleri Puthz, 1975 ( Figs 6A, B ) Brasilocaenis irmleri Puthz, 1975: 12 ; Irmler, 1975: 348 ; Malzacher, 1986: 85 (male, female, nymph, egg); Malzacher, 1998: 3 ; Lima & Boldrini, 2016: 2 (adult); Lima et al . 2019: 91 . Brasilocaenis irmeli , Shimano et al . 2011: 245 (misspelling). Distribution . Bolivia . Colombia . Brazil : states of Amazonas, Mato Grosso and Roraima . New record: Piauí State . Material examined . Four nymphs and one ♂ imago, Brazil , Piauí State , Campo Maior municipality, Lagoa do Arain , S4°50’26.1” , W42°10’50.1” , 119 m a.s.l. , 05.x.2014 , Lima, L. R .C. col. ( CEHJ ). Four nymphs and three ♂ imagos (reared), Brazil , Piauí State , Jatobá do Piauí municipality, Cachoeira de Pedra Negra , P 1, S5º01’22.4” , W41º56’29.9” , 141 m a.s.l. , 11.vii.2015 , Silva, A.P.S. coll. ( CEHJ ). Three imagos ( light trap ), Brazil , Piauí State , Batalha municipality, Longá River , Cachoeira do Urubu , S3°54’47.9” , W42°6’47.70” , 40 m a.s.l. , 17.iv.2017 , Lima, L. R .C., Moreno, L.A.S. cols. 15 ♂ imagos ( light trap ), Brazil , Piauí State , Alto Longá municipality, Longá River , Cachoeira da Campeira , S5°11’45.1” W42°15’33.9” , 177 m a.s.l. , 27.iv.2017 , Moreno, L.A.S. col. ( CEHJ ) . Comments . Brasilocaenis irmleri is related to the group of South American Caeninae with apically pointed forceps. It is easily distinguished from all Brasilocaenis species by the very long styliger plate with posterior margin rounded and forceps enlarged near base and narrow toward the apex, and fused to lateral margins of styliger plate (adapted from Puthz 1975 ).