Myosotella myosotis
Two views of a 7.5 mm adult turned at different angles to show all features
within palatal (outer) lip.
Single views of three juveniles, heights 5.8mm and 4.5mm.
1: sharp adapical angle of aperture.
2:parietal lip is a wide glazed area on the body whorl.
Juveniles (under 6.5mm high).
3:thin palatal (outer) lip lacks internal teeth and ridge.
4:columellar lip (lower part of inner lip) has two raised folds (partly concealed on some images as shell not tilted so as to show them).
5:parietal lip (upper part of inner lip) usually lacks a denticle.
Adults (over 6.5mm high).
6:palatal lip has internal pale calcareous ridge close to its rim.
7:single raised white denticle usually within the ridge.
8:columellar lip (lower part of inner lip) has two raised folds.
9:parietal lip (upper part of inner lip) often has a denticle.
Concise summary
Inner (columellar/parietal) lip has only 2 or 3 apertural protrusions.
Outer (palatal) lip has a single apertural denticle or none. Some have a pale apertural ridge running close to the lip.
Apertural views. Salting on Severn Estuary, Gloucestershire, England. August 2011.