Related how?

Biota (Life)
Eukaryote (Eukarya)
Podiata
Unikont (Unikonta)
Opisthokont (Opisthokonta)
Holozoa
Filozoa
Apoikozoa (Choanozoa)
Animal (Animalia)
Metazoa
Epitheliozoa
Eumetazoa
Bilateria
Nephrozoa (Eubilateria)
Protostome (Protostomia)
Spiralia (Spiralians)
Lophotrochozoa
Annelida (Annelid)
Clitellata
Oligochaeta
Haplotaxida

Opistocystidae (5176167)

Children (3 direct children, 12 direct and indirect children):

Opistocysta (tree size 7)

Trieminentia (tree size 1)

Crustipellis (tree size 1)