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
Neognathostomata

Pygaulidae (17200153)

Children (10 direct children, 53 direct and indirect children):

Plagiochasma pomel (tree size 4)
Plagiochasma

Echinogalerus (tree size 2)

Ovulechinus (tree size 1)

Hypopygurus

Pygaulus (tree size 2)

Pygopistes (tree size 2)

Pygorhynchus (tree size 8)

Trematopygus d'orbigny, 1857 (tree size 2)
Trematopygus

Botriopygus (tree size 22)
Bothriopygus

Caratomus