15 Myosotella myosotis form denticulata.

15 Myosotella myosotis form denticulata.

A pneumostome (respiratory pore) in the collar can be opened (1) for inhalation/exhalation of air or closed (2) to seal the cavity against dehydration.
Shell height 5 mm. Menai Strait, Wales. April 2018.

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