the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Nematoda (phylum)
Chromadorea (class)
Rhabditida (order)
[hide inferior taxa]
Cooperiidae (family)
Panagrolaimidae (family)
Panagrolaimoidea (superfamily)
Protostrongylidae (family)
Rhabditidae (family)
Strongyloididae (family)