Redescription of Hyphessobrycon cachimbensis (Characiformes: Characidae) with the description of a new congener from the Serra do Cachimbo, Brazil

• DOI: 10.1590/1982-0224-2023-0127
• Publication Date: 2024-05-20T10:31:40Z
• Authors: Manoela Maria Fer...; Fernando Cesar Pa...
• Keywords: Characidae; Characiformes; Congener

Abstract The Serra do Cachimbo is a highland area at the southeastern portion of Amazon Forest drained by headwaters tributaries rios Xingu and Tapajós. It known as an high level endemism fish, low species diversity, very few taxa with broad distribution in other parts Amazon. Despite its biogeographical importance, there are still many poorly sampled areas. Four expeditions to region yielded rediscovery known, endemic species, Hyphessobrycon cachimbensis, discovery similar, allopatric undescribed congener, frequently misidentified H. cachimbensis. We provided redescription cachimbensis description new species. Both can be differentiated from most congeners having conspicuous longitudinal dark stripe on body anal-fin base convex males, due thicker musculature insertion region. Other diagnostic features mostly related counts scales fin rays.