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Garden Snail
Cornu aspersum
101 observations
Common Periwinkle
Littorina littorea
85 observations
Brown-lipped Snail
Cepaea nemoralis
83 observations
Atlantic Dogwhelk
Nucella lapillus
74 observations
Common Whelk
Buccinum undatum
72 observations
Common European Limpet
Patella vulgata
61 observations
Purple Topshell
Steromphala umbilicalis
51 observations
Common Cockle
Cerastoderma edule
44 observations
Lined Top Shell
Phorcus lineatus
33 observations
Blue Mussel
Mytilus edulis
21 observations
European Common Cuttlefish
Sepia officinalis
21 observations
Great Scallop
Pecten maximus
21 observations
European Flat Oyster
Ostrea edulis
20 observations
Black Slug
Arion ater
20 observations
Variegated Scallop
Mimachlamys varia
19 observations
Banded Wedge Shell
Donax vittatus
18 observations
Pullet Carpet Shell
Venerupis corrugata
18 observations
Netted Dogwhelk
Tritia reticulata
17 observations
Common Tower Shell
Turritellinella tricarinata
17 observations
European Bittersweet Clam
Glycymeris glycymeris
16 observations
Striped Venus
Chamelea striatula
16 observations
Blue-rayed Limpet
Patella pellucida
15 observations
Grey Mail-shell
Lepidochitona cinerea
15 observations
Balea heydeni
Balea heydeni
13 observations
Peppery Furrow Shell
Scrobicularia plana
12 observations
Invasive
Reddish Daudebardia
Daudebardia rufa
11 observations
Grey Topshell
Steromphala cineraria
11 observations
Prickly Cockle
Acanthocardia echinata
11 observations
Leopard Slug
Limax maximus
10 observations
New Zealand Mudsnail
Potamopyrgus antipodarum
10 observations
Tree slug
Lehmannia marginata
10 observations
European cowrie
Trivia monacha
10 observations
Large Necklace Shell
Euspira catena
10 observations
Flat Periwinkle
Littorina obtusata
9 observations
Baltic Macoma
Macoma balthica
9 observations
Ocean Quahog
Arctica islandica
9 observations
Pod Razor
Ensis siliqua
9 observations
Rayed Trough Shell
Mactra stultorum
8 observations
Solid Surfclam
Spisula solida
8 observations
Spotted Seahare
Aplysia punctata
7 observations
River Limpet
Ancylus fluviatilis
7 observations
Strawberry Snail
Trochulus striolatus
6 observations
Queen scallop
Aequipecten opercularis
6 observations
White Aeolis
Favorinus branchialis
6 observations
Pod Razor
Pharus legumen
6 observations
Wrinkled Snail
Xeroplexa intersecta
6 observations
Great Pond Snail
Lymnaea stagnalis
5 observations
Common Atlantic Slippersnail
Crepidula fornicata
5 observations
Great Ram's-horn
Planorbarius corneus
5 observations
Runcina coronata
Runcina coronata
5 observations
Frequently Asked Questions
- The 10 most common molluscs in Gwynedd are:
- Garden Snail (Cornu aspersum)
- Common Periwinkle (Littorina littorea)
- Brown-lipped Snail (Cepaea nemoralis)
- Atlantic Dogwhelk (Nucella lapillus)
- Common Whelk (Buccinum undatum)
- Common European Limpet (Patella vulgata)
- Purple Topshell (Steromphala umbilicalis)
- Common Cockle (Cerastoderma edule)
- Lined Top Shell (Phorcus lineatus)
- Blue Mussel (Mytilus edulis)
- The most observed mollusc in Gwynedd is Garden Snail (Cornu aspersum), with 101 recorded observations.
- Some of the most commonly observed invasive molluscs in Gwynedd include:
- Reddish Daudebardia (Daudebardia rufa)