Juveniles live attached by byssus threads but as the animal matures it becomes free living. It prefers bottoms of sand or gravel where it rests in a self made depression. It can swim when necessary particularly when threatened. It filter feeds phytoplankton from the water column.

Lives on exposed rocky shores where it feeds by grazing algal material from the rock surface using its radula. Breeds in autumn/winter, eggs and sperm being released into the water column where fertilisation occurs. Larvae later settle in crevices or pools until they are 1-2mm when they migrate to more exposed microhabitats.

Lives on exposed rocky shores where it feeds by grazing material from the rock surface using its radula. Breeds almost throughout year but mainly in summer. Eggs are fertilised in the water column and larvae later settles in low shore pools.

Found on middle shore, often in pools or trickles from pools where it feeds by grazing material from the rock surface using its radula. Mainly breeds in summer. Eggs are fertilised in the water column and larvae later settles in low shore pools (especially amongst Lithothamnion) and wet areas.

Burrows in mud, sand, muddy sand, muddy gravel, shell gravel and occasionally amongst the roots of small algae such as Corallina. Lower shore to over 100m.

Burrows in muddy sand, sand and muddy gravel and shell gravel from low water to 150m.

Burrows in mud, muddy sand, muddy gravel and occasionally in shell gravel from 10 to 200m

Lives primarily in lagoons and inshore, locally common, but found from midshore to 50m. Active climber on vegetation such as Ruppia, Zostera, Chaetomorpha and other algae especially in lagoons whereit swarms and may be associated with juvenile Cerastoderma glaucum with which it may be confused. Occurs on a variety of algae in sheltered waters. Also living burrowed near the surface and lying on the surface of muddy sand, sand and muddy gravel. Tolerant of brackish conditions down to 17 parts per thousand and also tolerant of a wide range of temperature.

Lives on sandy mud or gravel where it filter feeds phytoplankton.

Lives on hard ground where it feeds by filtering phytoplankton