Water bear : Any species of Tardigrada, 2. See Illust. of Tardigrada.

Example:


Taxonomy
Tardigrades, The Biology of Tardigrades, water bear, Genomes, unranked, animals, Several species, free encyclopedia, Extreme environments, Milnesium, pressure, arthropod, moss, phylum Tardigrada, legs, pairs, Jönsson, superphylum.

Defination from the web:
water bear) ... The incredible water bear! Tardigrade Reference Center. Tardigrades in space. Tardigrade data and analysis. NASA's Tardigrade Research ...