Cerastoderma edule. Shell length 23mm. Exhalent (upper) and inhalent (lower) siphons. Camera-style eyes with single lens and retina on sensory tentacles detect moving shadows of predators. Mouth of Dee Estuary, Cheshire. October 2011. Species Cerastoderma edule Photographer / copyright holder I.F. Smith
Cerastoderma edule. Juvenile, length 9mm. Extended foot white, flattened like knife to penetrate sand, rounded in cross section when contracted. Can flex to jerk away from predators. Mouth of Dee Estuary, Cheshire. 24 October 2011. Species Cerastoderma edule Photographer / copyright holder I.F. Smith
Cerastoderma edule. Juvenile, length 9mm. Exhalent (upper) and inhalent (lower) siphons extend from posterior of shell. Part of foot extended. Mouth of Dee Estuary, Cheshire. 24 October 2011. Species Cerastoderma edule Photographer / copyright holder I.F. Smith
Myosotella denticulata. Heights 5mm, 6mm, 6.5mm. Outer wall of aperture has variable teeth, usually 2 or more: Left; 3 isolated teeth. Centre; 3 teeth deep inside aperture, and callus with new teeth growing near lip. Right; two teeth and callus near lip. Species Myosotella denticulata Photographer / copyright holder I.F. Smith
Myosotella denticulata. Shell height 6.5mm. High water mark and just above. Salting on sheltered Menai Strait (full salinity sea water). Under stones with terrestrial invertebrates. September 2011. Species Myosotella denticulata Photographer / copyright holder I.F. Smith
Myosotella denticulata. Shell height 6.5mm. Aperture lacks an operculum. Images of live animal in water. High water mark and just above. Salting on sheltered Menai Strait (full salinity sea water). Under stones with terrestrial invertebrates. Species Myosotella denticulata Photographer / copyright holder I.F. Smith
Myosotella myosotis. Heights 6mm - 7.5mm. Brown shells are slightly translucent, showing viscera indistinctly in good light (flash photograph). MHW, salt marsh, brackish 22ppt, Severn Estuary, August 2011. Species Myosotella myosotis Photographer / copyright holder I.F. Smith
Myosotella myosotis. Heights 7.5mm and 6mm. Periostracal hairs tend to wear off older specimens. MHW, salt marsh, brackish 22ppt, Severn Estuary, August 2011. Species Myosotella myosotis Photographer / copyright holder I.F. Smith
Myosotella myosotis. Height 7.5mm. Flesh of older specimens may be more grey than immatures. Transverse wrinkles sometimes visible as snail moves. MHW, salt marsh, brackish 22ppt, Severn Estuary, August 2011. Species Myosotella myosotis Photographer / copyright holder I.F. Smith
Myosotella myosotis. Height 7.5mm. Aperture not closed by an operculum. MHW, salt marsh, brackish 22ppt, Severn Estuary, August 2011. Species Myosotella myosotis Photographer / copyright holder I.F. Smith
