Children (14 direct children, 54 direct and indirect children):
Cibolaites
(tree size 2)
Collignoniceras
(tree size 8)
Prionocyclus
(tree size 11)
Germariceras
Oregoniceras
(tree size 4)
Subprionocyclus
(tree size 4)
Prionocycloceras
(tree size 3)
Lecointriceras
(tree size 3)
Reesidites
(tree size 2)
Itwebeoceras
Prionocyclites
(tree size 1)
Subprionotropis
(tree size 1)
Collignonicerites
(tree size 1)
Lymaniceras