Children (26 direct children, 27 direct and indirect children):
Pirenella nipponica
Pirenella cingulata
Pirenella conica
(tree size 1)
Pirenella alata
Pirenella microptera
Pirenella cancellata
Pirenella nanhaiensis
Pirenella incisa
Pirenella pupiformis
Pirenella caiyingyai
Pirenella arabica
Pirenella retifera
Pirenella asiatica
Pirenella rugosa
Pirenella delicatula
Pirenella austrocingulata
Pirenella balatonica
Pirenella boswellae
Pirenella cailliaudi
Pirenella etrusca
Pirenella graeca
Pirenella insculpta
Pirenella layardii
Pirenella mammillata
Pirenella subconica
Pirenella supracretacea