Hypsibius dujardini sensu lato is a species complex of tardigrade in the class Eutardigrada.

A member of this complex, Hypsibius exemplaris, is widely used for various research projects pertaining to evolutionary biology and astrobiology.

[1] The species, Hypsibius dujardini, is a tardigrade that prefers freshwater lakes, rivers, and streams.

[5] Hypsibius exemplaris contains an ortholog of the nuclear protein termed Dsup for damage suppression.

[6] Dsup binds to nucleosomes and protects chromatin DNA from hydroxyl radicals that could be generated by ionizing radiation or by hydrogen peroxide.