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Eutardigrades (Class Eutardigrada)Eutardigrades have existed since the Cretaceous (1). These tardigrades lack lateral appendages, such as sensory cephalic appendages and club-shaped appendage. They mainly live in freshwater bound, but Halobiotus has become adapted to live in marine environments. Many species use cryptobiosis to live temporarily in very dry environments. There are more than 700 species have been described.
The order Apochaela has one family, Milnesiidae. This includes Milnesium tardigradum, which resembles species found in Cretaceous amber (1). Other eutardigrades belong to the order Parachaela.