Related how?

Biota (Life)
Eukaryote (Eukarya)
Podiata
Unikont (Unikonta)
Opisthokont (Opisthokonta)
Holozoa
Filozoa
Apoikozoa (Choanozoa)
Animal (Animalia)
Metazoa
Epitheliozoa
Eumetazoa
Bilateria
Deuterostome (Deuterostomia)
Echinodermata (Echinoderms)
Sea urchin (Echinoidea)
Euechinoidea
Irregularia
Atelostomata

Cassiduloida (3199468)

Children (12 direct children, 236 direct and indirect children):

Apatopygidae (tree size 33)

Echinolampadidae (tree size 136)

Hardouinia (tree size 8)

Tropholampas (tree size 1)

Anochanus (tree size 1)

Neolampadina (tree size 43)

Cassidulina

Kassandrina (tree size 2)

Gentilia

Heteronucleus

Pseudonucleus

Rostropygus