Exoskeletal fragments of Cladocera occur abundantly in late-glacial and postglacial lake sediments. Of the various families of the Cladocera the Bosminidae and Chydoridae are represented by the greatest diversity of remains. The morphological differentiation of the chydorids is sufficiently great that species can be identified positively in most instances from the isolated components of the exo...

The description of the genus Coronatella Dybowski & Grochowski, 1894 (Cladocera: Chydoridae: Aloninae) pointed towards the need for a revision of species on a worldwide scale. For the Neotropical region, the main challenge noted was the redescription of Coronatella poppei (Richard, 1897). We redescribed this species and revised populations from Brazil that had previously been assumed to be Alon...

Previously, a series of Simocephalus taxa (Cladocera: Daphniidae) from China were described. Most were proposed to be junior synonyms in the last revision of the genus. Using original material from China and data from GenBank, we investigate the biodiversity and phylogeny of Simocephalus using sequences of the cytochrome c oxidase subunit I (COI) and the nuclear 18S genes. In both cases, neighb...

Cladocera of Alona affinis group from North America preserved in the collection of Professor D. G. Frey were investigated. A new subspecies of Alona ossiani Sinev, 1998 is described. Alona ossiani herricki ssp. nov. differs from the nominative subspecies in presence of 2-3 marginal denticles on postanal angle of male postabdomen, no differences between subspecies were revealed in the female mor...

Some water quality parameters (water temperature, conductivity, dissolved oxygen and pH) zooplankton fauna were investigated in 10 wells where the study was conducted. In this study, 14 species of Rotifera (46.67%), Copepoda (33.33%), 6 Cladocera (20%) identified. It found that widely distributed Rotaria neptunia (in 7 wells), Keratella quadrata 5 Daphnia curvirostris 8 Coronatella rectangula C...