Children (24 direct children, 20510 direct and indirect children):
Starfish
(tree size 4524)
Asteroidia
Sea urchin
(tree size 5804)
Echinoidea
Homalozoa
(tree size 27)
Homalozoans
Helicoplacus
(tree size 1)
Helicoplacoidea
Pelmatozoa
Eleutherozoa
(tree size 1)
Asterozoa
(tree size 4574)
Crinozoa
(tree size 1772)
Echinozoa
(tree size 3690)
Blastozoa
(tree size 90)
Stelleroidea
Carpoidea
Homalozoa
Echinopedinidae
Eocystites
Arkarua
(tree size 1)
Ctenoimbricata
(tree size 1)
Semperitidae
Pediculacaudinidae
Helicocystitidae
Tubocaudinidae
Discoidea
Mepygurus
(tree size 1)
Triboletia
Parablastoidea