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      • Issue 1
        • Collecting East African marine snails
        • Field meeting to Box Hill
        • Introduction
        • Oyster Catchers feeding on Patella vulgata
      • Issue 2
        • Collecting localities in the Cape Province
        • Field meeting Walton-on-Naze
        • Herons, Moorhens and Rats feeding on Anodonta anatina
        • Introduction to molluscan taxonomy 1) Species and subspecies
        • Volutes
      • Issue 3
        • Introduction to molluscan taxonomy 2) The significance of types
        • Land and freshwater snails: additions to the British List since 1926
        • Littoral collecting in the Scilly Isles
        • Snails in a Sussex garden
      • Issue 4
        • Biographical Note
        • Introduction to molluscan taxonomy 3) The genus
        • Learning in Nucella lapillus
        • Mollusca on Liverpool bomb sites
        • The Cardiacea
        • The Strombidae
      • Issue 5
        • A suggested method for extracting the animals from small high-spired shells
        • Commensual crabs in Mytilus edulis
        • Field meeting at Shell Bay, Dorset
        • Field meeting at West Runton and Overstrand
        • Introduction to molluscan taxonomy 4) Taxonomic history
        • J.G. Bruguiere 1750-98
      • Issue 6
        • A little more biography
        • Field meeting at Amberley
        • Field meeting to Grasswood, Yorkshire May 1962
        • Marine collecting in New Zealand
        • Marine mollusca of Carnac, Brittany
        • On the use and misuse of common names
        • Strand shells after Cornish gales
        • Trochus magus in the Isle of Wight
      • Issue 7
        • 35 years collecting
        • Field meeting Epping Forest
        • Field meeting White Downs
        • More strand shells after Cornish gales
        • Natural History Museum at Craster
        • Notes on the pholadidae
      • Issue 8
        • Field meeting at Norwich
        • Geology for conchologists - Introduction
        • Geology for conchologists - The last 15,000 years
        • The Strophocheilidae
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        • David Landsborough
        • Field meeting at Albury
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        • Still more autobiography
        • The Viviparidae
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Dosinia lupinus

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Widely distributed.

Occurs from the north of Norway to the Iberian Peninsula and into the Mediterranean.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Burrows deeply in sand (sometimes mixed with mud) and shell gravel. Feeds by filtering phytoplankton.

Similar species
  • Dosinia exoleta is larger, less smooth, and almost completely round
Key identification features
  • Pallial sinus forming a triangular indentation
  • Sculpture of fine concentric ridges giving a silky lustre
  • Margin of shell forms three fifths of a circle (posterior edge 'cut away')
Taxon version key
[NBNSYS0000175012]
Sort order
11040
Taxonomic group
Marine bivalve
  • Read more about Dosinia lupinus

Solid, almost round shell up to about 4cm across. Dirty white to light brown in colour and generally plain (no additional rays or streaks). Sculpture of fine concentric ridges and faint radiating lines and an almost silky lustre. Three cardinal teeth in each valve and single lateral tooth in left valve. Mantle tubes united throughout.

Dosinia exoleta

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Common

Occurs from Norway to the Iberian Peninsula and into the Mediterranean

Ecology and behaviour

Burrows deeply in shelly or muddy gravel. Feeds by filtering phytoplankton.

Similar species
  • Dosinia lupinus is smaller, smoother and less rounded
Key identification features
  • Pallial sinus forming a triangular indentation
  • Almost completely round outline to shell
  • Sculpture of concentric ridges giving the shell a coarse appearance
Taxon version key
[NBNSYS0000175011]
Sort order
11050
Taxonomic group
Marine bivalve
  • Read more about Dosinia exoleta

Solid almost round shell up to about 5cm across. Dirty white to light brown in colour usually with brown, red or pink rays, streaks or blotches. Sculpture of flat concentric ridges giving the shell a dull coarse appearance. Growth lines tend to be prominent. Three cardinal teeth in each valve and single lateral tooth in left valve. Mantle tubes united throughout.

Donax vittatus

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Common.

Recorded from Norwegian Sea and Baltic. Extends south to the Iberian Peninsula and into the Mediterranean.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Found just below the surface in firm sand on exposed shores. Feed on suspended organic matter collected through relatively short sipons.

Similar species
  • Donax variegatus has a smooth or very finely serrated margin
Key identification features
  • Wedge shaped shell which is triangular in outline
  • Margin coarsely serrated
  • Sculpture of raidating lines on valve surface
Taxon version key
[NBNSYS0000174995]
Sort order
10730
Taxonomic group
Marine bivalve
  • Read more about Donax vittatus

Solid glossy shell up to 4cm in length. White, yellow, brown or purple. Interior of shell white, often stained yellow, orange or purple. Pallial sinus deep and partially confluent with pallial line.

Donax variegatus

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Common.

Extends from the south and west coasts of Britain to the Mediterranean and along the Atlantic coast of Morocco.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Found just below the surface in firm sand on exposed shores where it feeds on suspended organic matter collected through relatively short sipons.

Similar species
  • Donax vittatus has a coarsely serrated margin
Key identification features
  • Wedge shaped shell which is triangular in outline
  • Smooth margin
Taxon version key
[NBNSYS0000174994]
Sort order
10720
Taxonomic group
Marine bivalve
  • Read more about Donax variegatus

Solid shell up to 4cm in length. Light yellow or olive sometimes flecked with cream or white. Inside of shell white; sometimes stained orange or purple. The surface is sculptured with a few concentric lines. Pallial sinus deep and partially confluent with pallial line.

Diodora graeca

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Vernacular names
Common keyhole limpet
Distribution and status

Not uncommon.

Occurs from the British Isles south to the Mediterranean but appears to be absent from the North Sea.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Lives attached to stones or rock where it feeds on sponges. Breed in winter and spring. Eggs are attached to the rock surface and young hatch as juveniles - there is no free swimming larval stage.

Similar species
  • Puncturella noachina has a slit slightly in front of the apex
Key identification features
  • Keyhole shaped opening in the apex of the shell
Taxon version key
[NBNSYS0000174957]
Sort order
600
Taxonomic group
Marine snail
  • Read more about Diodora graeca

Conical shell up to 25mm in length (10mm in height). The shell is white or yellow often with brown radiating rays. The surface is sculptured with 20-30 coarse radiating ridges interspersed with finer ones.

Devonia perrieri

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Widespread but not common.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Commensal. Lives attached to holothurians in the genus Leptosynapta including L. inhaerens and L. bergensis.

Key identification features
  • The hinge does not possess any teeth
  • Surface is only sculptured with concentric lines
Taxon version key
[NBNSYS0000174900]
Sort order
10040
Taxonomic group
Marine bivalve
  • Read more about Devonia perrieri

Fragile shell up to 5mm in length. Both the inside and outside of the shell are white to translucent in colour. The surface of the shell is sculptured with concentric lines and the margin is smooth.

Cuspidaria abbreviata

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Burrows in sandy mud. The species is carnivorous and feeds by sucking in food with an adapted muscular gill. It probably feeds mainly on dead crustaceans.

Key identification features
  • Very much shortened spout
  • Surface scupltured with faint concentric lines
Taxon version key
[NBNSYS0000174804]
Sort order
11540
Taxonomic group
Marine bivalve
  • Read more about Cuspidaria abbreviata

Brittle shell up to 1cm in length. The shell is white or cream in colour but is often translucent. The surface is covered with a brown periostracum? The inside of the shell is white. The surface is sculptured with concentric lines.

Crenella decussata

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Occurs in gravelly sand. It has only one siphon for expelling waste - water is taken in through the front of the shell. This species suspends itself by a single byssus thread.

Key identification features
  • Ribs are continuous over the shell surface
  • Decussate effect on shell surface caused by more than 50 radiating ribs and about 40 concentric lines
Taxon version key
[NBNSYS0000174746]
Sort order
9350
Taxonomic group
Marine bivalve
  • Read more about Crenella decussata

Brittle, plump, shell up to 3mm in length. It is cream in colour with yellow brown periostracum. The inside is dull white. The surface of the shell appears decussate due to radiating ribs crossed by concentric lines.

Corbula gibba

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Vernacular names
Common basket-shell
Distribution and status

Common. Distributed from Norway south to the Iberian Peninsula and into the Mediterranean and Black Seas.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Burrows just below the surface in muddy sand or gravel where it feeds by filtering phytoplankton

Key identification features
  • Right valve markedly larger than the left
Taxon version key
[NBNSYS0000174693]
Sort order
11140
Taxonomic group
Marine bivalve
  • Read more about Corbula gibba

Solid shell up to about 1.5cm in length. The right valve is very much larger than the left. The outside is white tinged with yellow. The inside is also white but tinged with blue, pink or yellow. The surface is sculptured with strong concentric ridges with a few faint radiating lines present on the left valve. The pallial line is faint and shows little indentation for the pallial sinus.

Colus jeffreysianus

Submitted by Steve Wilkinson on Sat, 05/12/2009 22:14
Distribution and status

Norway to Morocco.

The map provided here shows the distribution of the species based on Conchological Society data.

Ecology and behaviour

Lives on sandy or muddy bottoms on the continental shelves

Similar species
  • Colus islandicus Siphonal canal longer and narrower, shell more delicate, apex (juvenile shell) very bulbous
  • Colus gracilis Apex dilated, periostracum smooth, shell thicker
  • Colus holboelli Siphonal canal narrower, periostracum hairy, shell thin, Iceland, Shetland to Norway only
  • Colus turgidulus Siphonal canal very short, whorls inflated, suture canalised, shell thinner, Norway to Spitzbergen, Shetland and Faroes
Key identification features
  • Apex not dilated as in Colus gracilis and Colus islandicus
  • Spiral ridges on body whorl only about 30
  • Periostracum hairy, pale yellow
Taxon version key
[NBNSYS0000174669]
Sort order
2920
Taxonomic group
Marine snail
  • Read more about Colus jeffreysianus
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Shell spindle shaped, up to 60mm high. Up to 8 slightly rounded whorls, making the shell slightly turreted. Apex of the shell sharp. Sculpture of numerous spiral ridges and growth lines. Mouth oval, siphonal canal short and broad. Shell white with a bluish or pinkish tinge, covered by a slightly hairy pale yellow periostracum, the hairs may be worn off. A very variable species.

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