root › cellular organisms › Eukaryota › Opisthokonta › Metazoa › Eumetazoa › Bilateria › Protostomia › Ecdysozoa › Nematoda › Chromadorea › Rhabditida › Spirurina › Spiruromorpha › Filarioidea › Onchocercidae › Cercopithifilaria › Cercopithifilaria johnstoni