Cruz Paulo Vilela, GonÇalves InÊs C, Mariano Rodolfo, Hamada Neusa
Universidade Federal de Rondônia-UNIR, Programa de Pós-Graduação em Ciências Ambientais-PPGCA, Programa de Pós-Graduação em Ensino de Ciências da Natureza-PPGECN, Laboratório de Biodiversidade e Conservação-LABICON, CEP 76940-000, Rolim de Moura, Rondônia, Brazil Instituto Nacional de Pesquisas da Amazônia-INPA, Coordenação de Pesquisas em Biodiversidade, Laboratório de Citotaxonomia e Insetos Aquáticos-LACIA, CEP 69067-375, Manaus, Amazonas, Brazil..
Zootaxa. 2020 Jul 27;4820(1):zootaxa.4820.1.11. doi: 10.11646/zootaxa.4820.1.11.
A new species of Bessierus Thomas Orth, formerly a monotypic genus, is described from Amapá State, Brazil. The type species of the genus, B. doloris Thomas Orth, had only its nymphs described until recently, when its male imago was associated to nymphs mainly based on pigmentation pattern. Bessierus riobranco sp. n. here described has no significant difference on pigmentation pattern from B. doloris, thus the new species could be the male imago of B. doloris, and the putative imago of B. doloris a new species, or even both described imagoes could be new species. Still, a new male imago existence cannot be neglected and we opted to provide a properly description, diagnosis and illustration, hence contributing to the knowledge of mayfly neotropical diversity and future research on the genus. The generic concept of Bessierus and its type species diagnoses are altered to accommodate the new species, and a new record of B. doloris is provided.
