Synonyms for Tardigrada (same or very similar meaning)
WordNet sense 1 (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):
class TardigradaFrom the ODE community, based on WordNetadd/edit