TARDIGRADA
Tardigrada, class Tardigrada
(noun) in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx
Source: WordNet® 3.1
Tar`di*gra"da, n. pl. Etym: [NL. See Tardigrade, a.]
1. (Zoöl.)
Definition: A tribe of edentates comprising the sloths. They are noted for
the slowness of their movements when on the ground. See Sloth, 3.
2. (Zoöl.)
Definition: An order of minute aquatic arachnids; -- called also bear
animalcules, sloth animalcules, and water bears.
Source: Webster’s Unabridged Dictionary 1913 Edition