Bores into sand, limestone or sandstone.
Fragile shell up to 2.5cm in length. The shell is dull white in colour both outside and inside but the outside is obscured by brown perisotracum. The surface of the shell is sculptured with $incised concentric lines?$
FrequentLofoten islands to the Mediterranean.
Occassionally swims by flapping its valves. Burrows in coarse sand or gravel.
Thin, but solid, shell up to about 2.5cm. Yellowish white with pink red or violet radiating rays. Exterior colouration repeated on the interior. Glossy with fine concentric ribs and radiating lines.Slight gape at each end. Siphons long and separate.
Very common
Norway south to the Iberian Peninsula and into the Mediterranean
Burrows in sand or shell gravel
Solid but thin shell up to about 5cm in length. Colour white, yellow, pink or red often combined to display radiating rays but generally obscurred by a partial cover of a dark green epidermis (periostracum) . Inside of shell white, pink or purple and generally whiter towards the edges. Surface of shell sculptured with well defined concentric ridges crossed by around eight radiating ribs. Pallial sinus relatively deep with border partially confluent with pallial line. ? Check glossy or not?
Locally common
From Norway south to the Iberian Peninsula and into the Mediterranean.
Burrows in sand or coarse sand
Solid shell up to about 6.5cm in length. White or cream often with pink or purple radiating rays. Inside purple or yellow. Partially covered with a dark green/brown epidermis. Glossy. Sculpture of concentric lines and very fine radiating lines.
Not common
North Sea to the Iberian Peninsula and into the Mediterranean
Burrows in muddy or fine sand
Brittle shell up to about 2.5cm in length. Colour white or pink often with patches/rays of purple or red. Inside similarly coloured. Sculpture of fine concentric ridges and up to about 20 sharp ridges running towards the hind margin.
Common
Norway down to the Iberian Peninsula and into the Mediterranean and Black Sea.
Burrows in clean sand or muddy sand where it feeds on organic detritus picked up through the siphon.
Fragile shell up to about 2cm in length. Glossy white, yellow or orange in colour. Sculpture of concentric rings with diagonal striations on the right valve. Relatively deep pallial sinus which is confluent with the pallial line. Cruciform muscle scars indistinct.
Fragile shell up to 1mm? in length. It is coloured yellow to white both inside an out. The surface of the shell is sculptured with concentric and radiating lines.
Recorded from the Norwegian Sea and Baltic, south to the Iberian Peninsula and into the Mediterranean.
Burrows in fine or silty sand. Remains close to the surface while submerged in water, retreating to a depth of up to half a metre when exposed.
Elngate shell up to about 21cm in length. Both dosal and ventral edges of the shell are straight. White or creamy white in colour with red-brown streaks streaks. Periostracum dark green to yellow-green. Shell sculptured with smooth horizontal and vertical lines with clear growth lines.
Recorded from the Norwegian Sea and Baltic to the Iberian Peninsula and into the Mediterranean.
Burrows in fine or silty sand. Remains close to the surface while submerged in water, retreating to a depth of up to half a metre when exposed.
Slender shell up to about 10cm in length. Edges curved and parallel, tapering towards the posterior end. Creamy white in colour with red-brown streaks streaks. Periostracum dark green to yellow-green. Shell sculptured with very fine horizontal and vertical lines with clear growth lines. Foot is reddish in colour.
Burrows in fine or silty sand. Remains close to the surface while submerged in water, retreating to a depth of up to half a metre when exposed.
Slightly curved shell up to about 15cm in length. White or creamy white in colour with red-brown or orange streaks/blotches. Periostracum dark green to yellow-green.