The shell of Lacuna parva is white often with three brown or reddish brown spiral bands on body whorl. It has a columellar groove, umbilicus and a small spire which is usually c. 30% to 40% (white shell) of shell height. Aperture occupies about 50% of area in apertural-view. Body translucent white often finely stippled grey.
Height 3.5 mm, Menai Strait, August 2013 and height 4 mm (white shell), west Anglesey, March 2014.

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