Children (8 direct children, 120193 direct and indirect children):
Pycnogonida
(tree size 2009)
Sea spiders
Nektaspida
(tree size 17)
Sanctacaris
(tree size 1)
Yunnanata
Anthropleuridea
Parapaleomerus
(tree size 1)
Offacolidae
Euchelicerata
(tree size 118157)