Ultrastructure of the nephron in the soft-shelled turtle, Pelodiscus sinensis (Reptilia, Chelonia, Trionychidae)

► In the present paper, we highlight the ultrastructure of nephrons in Pelodiscus sinensis and discuss the functional significance of the findings. ► The morphological features have been compared to those of other vertebrates, mainly in other orders of reptiles. ► The present study, employing both light microscopy based reconstructions and electron microscopy, considerably improves the structural understanding of the reptilian kidney. ► This work is a contribution to the knowledge of the kidney of P. sinensis, frequently used as an experimental model for physiological and biochemical studies.