Children (7 direct children, 147 direct and indirect children):
Microspirobolus
(tree size 7)
Physobolus
(tree size 4)
Spirobolellus
(tree size 89)
Poratobolus
(tree size 2)
Paraspirobolus
(tree size 3)
Hylekobolus
(tree size 12)
Spirobolellinae
(tree size 23)