root › cellular organisms › Eukaryota › Opisthokonta › Metazoa › Eumetazoa › Bilateria › Protostomia › Ecdysozoa › Nematoda › Chromadorea › Rhabditida › Tylenchina › Panagrolaimomorpha › Strongyloidoidea › Strongyloididae › Strongyloides › Strongyloides stercoralis