Biota (Life)
Eukaryote (Eukarya)
Podiata
Unikont (Unikonta)
Opisthokont (Opisthokonta)
Holozoa
Filozoa
Apoikozoa (Choanozoa)
Animal (Animalia)
Metazoa
Epitheliozoa
Eumetazoa
Bilateria
Nephrozoa (Eubilateria)
Protostome (Protostomia)
Ecdysozoa (Ecdysozoan)
Cycloneuralia
Nematoida (Nematoidea)
Nematomorpha (Gordian worm)
Palaeoscolecid (Palaeoscolecida)
Palaeoscolecidae
Children (2 direct children, 2 direct and indirect children):
Palaeoscolex antiquus
Palaeoscolex piscatorum