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Daphnia is a genus of small planktonic crustaceans, 0.2–6.0 mm (0.01–0.24 in) in length. Daphnia are members of the order Anomopoda , and are one of the several small aquatic crustaceans commonly called water fleas because their saltatory swimming style resembles the movements of fleas .
Daphnia magna presents numerous advantages when used as experimental organism. Its transparency allows for the observations of its inner anatomical structures at the microscope , while its reproduction through cyclical parthenogenesis allows to generate clones (asexual reproduction) or to perform crossing between strains (sexual reproduction).
Daphnia pulex. The genus Daphnia (Crustacea: Cladocera: Daphniidae) contains over 200 species of water fleas, many of which are in need of further taxonomic investigation (species inquirendae; marked with asterisks). [1]
Infection of Daphnia populations by Hamiltosporidium have been recorded in the United Kingdom, Russia, Belgium and Israel (H. magnivora), [6] as well as Sweden, Finland and Israel (H. tvaerminnensis). [7] [8] While its host D. magna is found all over the northern hemisphere, the two Hamiltosporidium species seem to have a limited geographic ...
Daphnia magna. According to the World Registry of Marine Species, Cladocera is a synonym of the superorder Diplostraca, which is included in the class Branchiopoda. Both names are currently in use. The superorder forms a monophyletic group of 7 orders, about 24 families, and more than 11,000 species. Many more species remain undescribed.
Daphnia pulicaria have a translucent carapace and two prominent second antennae, which they use to move. [11] The carapace, composed primarily of chitin, helps protect the feeding apparatus, and it is periodically shed during an individual's life. [11] Daphnia have a compound eye, and they are known to have an optomotor response. [12]
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