[PDF] A golden age of gelata: past and future research on planktonic ctenophores and cnidarians | Semantic Scholar

The evolutionary relationships among gelatinous zooplankton are summarized, biological factors that likely contribute to blooms are emphasized, and a population genetic framework for investigating the ecological causes of boom and bust population dynamics in the plankton is outlined.

Under these conditions, jelly plankton in freshwater is represented by 20–40 species of cnidarians, by a few rhabdocoelid flatworms, and by up to 200 rotifer species (600+ if the periphytic and benthic species are included, and almost 1,500 species if males are included).