COMPARISON of T. nitida. (odd numbers) with T. reticulata sensu stricto (even numbers).
Numbers match those in the image
1: spire whorls convex. (Tumidity of T. nitida varies in Mediterranean.)
2: spire whorls almost flat.
3: translucent parietal lip exposes colour of underlying body whorl. (Occasionally opaque in Mediterranean.)
4: opaque white parietal lip, semicircular, conceals colour of body whorl.
5: protoconch eroded on this one and nearly all T. nitida in sample. (Generally eroded on live T. nitida in Ria de Vigo.)
6: protoconch intact. (Generally intact on T. reticulata in Ria de Vigo.)
7: siphonal canal meets palatal lip at obtuse angle (120° in this case).
8: siphonal canal meets palatal lip at acute or right angle (80° in this case).
Angle on both species alters if eroded; fresh unworn shells required.)