The ciliated cells of the respiratory epithelium play an important role in the pulmonary mucociliary clearance mechanisms. Ultrastructural changes in the cilia of these cells can therefore be an expression of pathogenetic processes in the context of respiratory diseases. Against this background, ultrastructural indications of ciliary dyskinesia in common marmosets (Callithrix jacchus) of different ages and taking into account clinically inapparent pulmonary changes were determined in the present work in order to make a contribution to the validation of common...