class Onychophora
— Navneord
– Engelsk
～ 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
class Oomycetes
— Navneord
– Engelsk
～ nonphotosynthetic fungi that resemble algae and that reproduce by forming oospores; sometimes classified as protoctists