The Atya genus classification is mostly stabilized, comprising 13 species in the Americas and West Africa. However, nearly 40 years have passed since its last revision. Some taxonomic questions remained due to morphological uncertainty, and new ones have been raised with molecular Atyidae phylogenies. The aim of this study was to conduct the first Atya molecular systematic assessment, verifying the taxonomic status of A. gabonensis, A. innocous, A. margaritacea and A. scabra. Gene fragments (16S, COI and H3) were obtained by DNA sequencing and used for genetic distance, phylogeny and species delimitation analyses (ABGD, PTP and GMYC). Our data corroborate A. gabonensis as a species with amphi-Atlantic distribution and suggest the use of A. innocous for specimens of the Caribbean Sea. We revalidated A. tenella Smith, 1871 for specimens from Pacific. Atya margaritacea, distributed along the Pacific coast of the Americas, was considered a valid and distinct species from A. scabra, which is distributed in the Atlantic and Pacific coasts of the Americas and West Africa; moreover, maybe this wide distribution belongs to a distinct species, being A. scabra restricted to "Gulf of Mexico lineage". We corroborated the genus as monophyletic and highlighted remaining systematic issues. Overall, our multigene-based phylogeny and species delimitation analyses suggest that Atya comprises 14 species. This study provides data for future studies on the biodiversity, evolution and conservation of freshwater Atyidae shrimps and Neotropical fauna.

中文翻译：

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根据基于多基因的系统发育和物种定界推断，对虾属 Atya（十足目，Atyidae）的系统学

该Atya属分类主要是稳定，包括13种在美洲和西非。然而，距离上次修订已经过去了近 40 年。由于形态学的不确定性，一些分类学问题仍然存在，并且随着分子 Atyidae 系统发育提出了新的问题。本研究的目的是进行第一次Atya分子系统评估，验证A. gabonensis、A. innocous、A. margaritacea和A. scabra的分类地位。基因片段（16S、COI 和 H3）通过 DNA 测序获得，用于遗传距离、系统发育和物种定界分析（ABGD、PTP 和 GMYC）。我们的数据证实了A. gabonensis作为具有两栖-大西洋分布的物种，并建议使用A. innocous作为加勒比海的标本。我们重新验证了A. tenella Smith, 1871 的太平洋标本。Atya margaritacea分布于美洲太平洋沿岸，被认为是与分布于美洲和西非大西洋和太平洋沿岸的A. scabra有效且不同的物种；此外，也许这种广泛分布属于一个独特的物种，即A. scabra仅限于“墨西哥湾谱系”。我们证实该属是单系的，并强调了剩余的系统问题。总体而言，我们基于多基因的系统发育和物种定界分析表明，Atya包括14种。该研究为未来淡水虾科虾和新热带动物群的生物多样性、进化和保护研究提供了数据。