Cladocera (Crustacea, Branchiopoda) species of Bahia State, Brazil: a critical update on species descriptions, distributions, and new records

Abstract Despite the rising interest in cladoceran biogeography worldwide, many species distributions are still unknown to science, especially in naturally rich freshwater of the Neotropics. Herein we present a checklist of the taxa, giving the distributions of the valid species throughout 13 hydrographic basins within the two freshwater ecoregions of Northeastern Mata Atlântica and São Francisco. Superorder Cladocera comprises 72 known species in Bahia State classified into two orders: the Anomopoda, represented by Chydoridae (36 spp), Daphniidae (7), Macrothricidae (6), Bosminidae (4), Moinidae (3) and Ilyocryptidae (2); and Ctenopoda, represented by Sididae (8 spp). Species from the orders Onychopoda and Haplopoda are still lacking in Neotropical waters. The first compilation of the data on the Cladocera of Bahia, Brazil, is represented by this checklist and contains 38 new records for the state. Critical remarks on species distributions, as well as detailed information on sampling sites and geographic coordinates are also included.

摘要 尽管全球范围内对枝角类生物地理学的研究兴趣与日俱增，但学界对诸多物种的分布仍缺乏系统认知，尤其是在新热带区（Neotropics）物种禀赋丰富的天然淡水生境中。本研究编制了该类群的分类物种名录，详细列出了东北部大西洋森林（Northeastern Mata Atlântica）与圣弗朗西斯科（São Francisco）两个淡水生态区（freshwater ecoregions）内13个水文流域（hydrographic basins）中各有效物种的分布情况。巴伊亚州（Bahia State）已知的枝角总目（Cladocera）物种共计72种，隶属于两个目：异足目（Anomopoda），包含盘肠溞科（Chydoridae，36种）、溞科（Daphniidae，7种）、大尾溞科（Macrothricidae，6种）、秀体溞科（Bosminidae，4种）、裸腹溞科（Moinidae，3种）以及隐脉溞科（Ilyocryptidae，2种）；以及栉足亚目（Ctenopoda），仅包含仙达溞科（Sididae，8种）。新热带区水域尚未记录到有爪目（Onychopoda）和单足部（Haplopoda）的物种分布。本物种名录为巴西巴伊亚州枝角类研究的首次系统性数据汇编，共收录该州38个新分布记录。此外，文中还附带了物种分布的关键评述，以及采样点位和地理坐标的详细信息。