Distinct from the phylum Annelida

• Resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids
• Enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Malacopoda \Mal`a*cop"o*da\, prop. n. pl. [NL., fr. Gr. malako`s soft + -poda.] (Zo["o]l.) A class of air-breathing Arthropoda; -- called also Protracheata , and Onychophora . Note: They somewhat resemble myriapods, and have from seventeen to thirty-three ...

Wikipedia Word definitions in Wikipedia
Velvet worms are ecdysozoan invertebrate animals of the phylum Onychophora (from Greek, onyches , "claws"; and pherein , "to carry") with approximately 200 species. These elongate, obscurely segmented organisms have tiny eyes , antennae , many pairs of ...