Children (18 direct children, 8548 direct and indirect children):
Anaspidea
(tree size 255)
Notaspidea
(tree size 1)
Sidegill slugs
Nudibranchia
(tree size 5204)
Nudibranchs
Thecosomata
(tree size 588)
Sea butterflies
Pteropoda
Pteropods
Acochlidiacea
(tree size 47)
Gymnosomata
(tree size 133)
The sea angels
Cephalaspidea
(tree size 1933)
Headshield slugs
Soleolifera
(tree size 31)
Architectibranchia
(tree size 2)
Pleurobranchomorpha
(tree size 206)
Rhodopemorha
Umbraculida
(tree size 43)
Acochlidea
(tree size 1)
Nonacteoninidae
Sulcoactaeonidae
Runcinacea
(tree size 86)
Acochlidacea