Children (11 direct children, 12 direct and indirect children):
Porcupine ray
(tree size 1)
Urogymnus asperrimus
Urogymnus africanus
Urogymnus acanthobothrium
Mumburarr whipray
Urogymnus ukpam
Urogymnus dalyensis
Urogymnus granulatus
Urogymnus lobistoma
Urogymnus lobistomus
Urogymnus polylepis
Urogymnus natalensis
Urogymnus poecilura
Urogymnus rhombeus