Description of two threatened and polymorphic seasonal killifish species of the genus Hypsolebias (Cyprinodontiformes: Rivulidae) from the Piranhas-Açu River basin, in the Brazilian semiarid. - Abrantes, Yuri Gomes; Berbel-Filho, Waldir Miron; Carvalho, Roberto Almeida; Anselmo Ramos, Telton Pedro; Queiroz Lima, Sergio Maia (Neotropical Ichthyology, 2026)