Children (20 direct children, 38 direct and indirect children):
Triarthrus
(tree size 3)
Olenus
Olenus (trilobite)
Balnibarbi
(tree size 3)
Balnibarbi (trilobite)
Cloacaspis
(tree size 3)
Svalbardites
(tree size 2)
Boeckaspis
Euonchonotina
Highgatella
Helieranella
Triarthrinae
(tree size 2)
Oleninae
Balnibarbiinae
Pelturinae
Plicatolininae
Leptoplastinae
Hypermecaspidinae
Bienvillia
(tree size 2)
Hypermecaspis
(tree size 1)
Psilocara
(tree size 1)
Tropidopyge
(tree size 1)