How many species of Cladocera are there?

Cladocera fauna composition in a river-lagoon system of the upper Paraná River floodplain, with a new record for Brazil

“…According to Korovchinsky (1996), the estimate of the number of fresh water cladoceran species in the world is in the range of 600. Of these, only 129 species can be considered as valid species or as sufficiently well described, while about 146 species are relatively well described, and the status of all other species is vague.…”

Composição da comunidade zooplanctônica de um pequeno açude da Reserva Particular do Patrimônio Natural da Mata Atlântica (RPPN) Fazenda Lagoa, município de Monte Belo - MG.

“…A maior parte dos estudos sobre a biodiversidade nos ecossistemas de água doce é focada para vertebrados e é ainda muito incompleto para os microorganismos e invertebrados (ROCHA, 2003). Estimativas apontavam cerca de 600 espécies da comunidade zooplanctônica ocorrendo em todo o mundo (KOROVCHINSKY, 1996) e aproximadamente 150 espécies ocorrem no Brasil (ROCHA;GÜNTZEL, 2000). Estima-se que o número seja muito maior, mas a área de varredura ainda é muito pequena.…”

Biogeography and taxonomy of New Zealand Cladocera (Anomopoda, Chydoridae): a review

“…They argued that both loss and gain of structures during evolution may influence the probable direction of the ecological shifts (Adamowicz & Sacherova 2006). The morphological (taxonomic) species concept considers that species may be separated by means of ecological adaptation as well as by reproductive isolation (Korovchinsky 1996). However, it appears that factors including micro-habitat structure and body character evolve together for adaptation to climates which then determine the large-scale ecological shifts in some species of chydorid Cladocera.…”

“…Several revisions to the taxonomy and systematics of the chydorid Cladocera have been made (Frey 1987;Korovchinsky 1996Korovchinsky , 1997Kotov 2009) based on analyses of both modern (Sinev 2004) and fossil (Frey 1987) cladoceran morphological variability in body parts and ontogenic change (Sacherova & Hebert 2003). However, pertinent taxonomic studies in New Zealand lakes are few.…”