ABSTRACT
A new species of Hypostomus Lacépède is described from the rio Paraguaçu basin, Bahia State, Brazil. The new species is distinguished from its congeners by having black and conspicuous dots on a pale background, which are similar in size on the head, trunk, and fins, along with ventral surface of head and abdomen naked or the latter plated exclusively on its anterior portion, absence of ridges on head and trunk, and caudal-fin lobes relatively similar in length. The new species further differs from the sympatric H. chrysostiktos by having seven branched dorsal-fin rays instead of 10-11 and represents the eleventh siluriform species endemic to the rio Paraguaçu basin.
Uma espécie nova de Hypostomus Lacépède é descrita da bacia do rio Paraguaçu, estado da Bahia, Brasil. A espécie nova distingue-se de suas congêneres por apresentar corpo com manchas pretas e conspícuas sobre fundo claro de tamanho semelhante no tronco, cabeça e nadadeiras, além da superfície ventral da cabeça e abdômen nus ou apenas porção anterior do abdômen coberto por placas, ausência de quilhas na cabeça e no corpo e lobos da nadadeira caudal relativamente similares no comprimento. A espécie nova difere ainda da simpátrica H. chrysostiktos por ter sete raios ramificados na nadadeira dorsal ao invés de 10-11 e representa a décima primeira espécie de siluriforme endêmica da bacia do rio Paraguaçu.
Subject(s)
Animals , Catfishes/classification , Sympatry/genetics , Catfishes/anatomy & histology , Species SpecificityABSTRACT
Lutzomyia longipalpis s.l. is the main vector of American visceral leishmaniasis (AVL) and occurs as a species complex. DNA samples from two Brazilian sympatric species that differ in pheromone and courtship song production were used to analyse molecular polymorphisms in an odorant-binding protein ( obp29 ) gene. OBPs are proteins related to olfaction and are involved in activities fundamental to survival, such as foraging, mating and choice of oviposition site. In this study, the marker obp29 was found to be highly polymorphic in Lu. longipalpis s.l. , with no fixed differences observed between the two species. A pairwise fixation index test indicated a moderate level of genetic differentiation between the samples analysed.