Related how?

Biota (Life)
Eukaryote (Eukarya)
Chromista
Harosa
Halvaria
Alveolate (Alveolata)
Ciliophora (Ciliates)
Oligohymenophorea
Peritrichia (Peritrich)
Sessilida (Sesselida)

Operculariidae (23196952)

Children (2 direct children, 6 direct and indirect children):

Opercularia (tree size 3)
Opercularia (ciliate)

Pyxidium (tree size 1)