Diversidade de microcrustáceos (cladocera e ostracoda) da região central e norte da Amazônia maranhense.

Abstract

This study aimed to investigate the diversity and distribution of Cladocera and Ostracoda species in the water bodies of the river basins in the state of Maranhão, Brazil, focusing on the central and northern regions of the state. Specifically, the study sought to identify the species present, describe new species of Ostracoda, and record new occurrences of Cladocera for the region. Samples were collected from various aquatic environments, such as rivers, lakes, and temporary ponds, using plankton nets and other active sampling techniques. In the laboratory, the samples were fixed, sorted, and identified with the aid of microscopy and specialized taxonomic keys. The results revealed the occurrence of six new Cladocera species for Maranhão, with some of these records already published in the journal Zootaxa. Additionally, a new specimen of Pelocypris, Klie, 1939 (a genus of Ostracoda), was identified and is being described as a new species. The data collected contribute to filling gaps in the knowledge of the region's microcrustacean fauna and provide important insights into local aquatic biodiversity. In conclusion, the study revealed a significant diversity of Cladocera and Ostracoda in the region, highlighting the need for further taxonomic and ecological research to better understand and preserve these underexplored aquatic ecosystems.