In the Adriatic, the spire whorls of T. nitida vary from convex (1) to nearly flat (2). The protoconch, which is frequently worn or broken off to give a blunt apex in Essex T. nitida, appears to persist more on Adriatic specimens (3).

Apart from a labial varix on almost all T. nitida there are frequently additional varices (4) in the Adriatic.

Croatia, Adriatic. © J. Prkić.