Children (7 direct children, 361 direct and indirect children):
Elpidiidae
(tree size 184)
Psychropotidae
(tree size 72)
Laetmogonidae
(tree size 51)
Deimatidae
(tree size 31)
Pelagothuriidae
(tree size 16)
Enypniastidae
Palaeocaudinidae
Pelagothuridae