Synonyms for Class Onychophora (same or very similar meaning)
WordNet sense 1 (enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids):
OnychophoraFrom the ODE community, based on WordNetadd/edit