Children (9 direct children, 99 direct and indirect children):
Echinus
(tree size 35)
Echinus (sea urchin)
Paracentrotus
(tree size 3)
Psammechinus
(tree size 25)
Sterechinus
(tree size 7)
Dermechinus
(tree size 3)
Gracilechinus
(tree size 14)
Polyechinus
(tree size 1)
Stirechinus
(tree size 2)
Hypechinus