Description of two new species of the genus Rivulus (Cyprinodontiformes: Rivulidae) from eastern South American coastal plains

Abstract

Two new species of Rivulus from eastern Brazil are described. They are considered to be closely related to R. santensis Kohler, 1096, R. haraldsiolii Berkenkamp, 1984, R. luelingi Seegers, 1984 and R nudiventris Costa, 1990, by sharing a unique anguloarticular shape. Rivulus janeiroensis n. sp. differs from closely related species by having a greater caudal fin. It has been collected within forests in small isolated basins from Estado do Rio de Janeiro. Rivulus depressus n. sp. is distinguished from closely related species by having greater head length and smaller depth head. It has been found in a forested small strean, near Porto Seguro, Estado da Bahia.