1. Translucent yellow-horn shell colour of Potamopyrgus antipodarum is often hidden by dark encrustation, except on the most recent whorl of still growing juveniles and sub-adults, such as this, shell height 3.8mm.
2. Translucent yellow-horn shell colour of Potamopyrgus antipodarum is often hidden by dark encrustation, except on the most recent whorl of still growing juveniles and sub-adults, such as this, shell height 3.8mm.

Translucent yellow-horn shell colour of Potamopyrgus antipodarum is often hidden by dark encrustation, except on the most recent whorl of still growing juveniles and sub-adults, such as this, shell height 3.8mm.