This snail is often found in extremely high densities; up to 300,000 individuals have been recorded per square metre (1). When covered by the tide, it floats upside down on the surface of the water on a 'raft' of mucus (2). When the tide has gone out, this snail often climbs up vertical objects in order to browse (1). It feeds on silt, fungi, and diatoms, which it scrapes from the sediment surface with the radula, a narrow structure in molluscs that bears teeth and is used to rasp food (2). When floating, the snail also feeds on particles that become trapped in the mucus raft (2).
Breeding occurs in spring and autumn (1); the sexes are separate, and fertilisation occurs internally (2). Egg masses of 4-8 eggs are usually cemented onto the shells of other laver spire snails and become covered with a protective layer of sand grains (2). There is some dispute as to the biology of the larval stage; research has shown that the larvae are planktonic, whereas other researchers have found that there is no planktonic stage, and that the larvae live on the substrate (1).