19 Myosotella myosotis. Adult. Height 7.5 mm. Salting on Severn Estuary, Gloucestershire, England. August 2011. Left: in water. Right: same specimen in air.

19 Myosotella myosotis. Adult. Height 7.5 mm. Salting on Severn Estuary, Gloucestershire, England. August 2011. Left: in water. Right: same specimen in air.

When immersed, the body absorbs water and swells, the body colour becomes paler, and translucency of the shell and body increases.
In the left image a large bubble of air can be seen in the mantle cavity.

marinvert.senckenberg.science/image-browse/