Non-Native Species of the England’s East Coast
Photo Common Name Latin Name Number of Observations
Common Atlantic Slippersnail Crepidula fornicata 1046
Eastern Oyster Drill Urosalpinx cinerea 424
Beaked Barnacle Austrominius modestus 278
Pacific Oyster Magallana gigas 182
Atlantic Jackknife Ensis leei 144
Colonial Sea Squirt Perophora japonica 136
Stalked Sea Squirt Styela clava 114
Brush-clawed Shore Crab Hemigrapsus takanoi 82
Japanese Wireweed Sargassum muticum 62
Devil’s Tongue Weed Grateloupia turuturu 61
Wakame Undaria pinnatifida 52
NA Corella eumyota 44
Chinese Mitten Crab Eriocheir sinensis 25
NA Botrylloides violaceus 15
NA Bugula neritina 14
OysterThief Colpomenia peregrina 7
San Diego Sea Squirt Botrylloides diegensis 6
Japanese Skeleton Shrimp Caprella mutica 5
Striped Green Sea Anemone Diadumene lineata 4
Red Ripple Bryozoan Watersipora subatra 4
NA Ammothea hilgendorfi 4
Dead Man’s Fingers Codium fragile fragile 2
NA Tricellaria inopinata 2
NA Ficopomatus enigmaticus 1
Non-Native Species of the East Midland’s Coast
Photo Common Name Latin Name Number of Observations
Common Atlantic Slippersnail Crepidula fornicata 25
Beaked Barnacle Austrominius modestus 9
Atlantic Jackknife Ensis leei 6
Chinese Mitten Crab Eriocheir sinensis 2
Non-Native Species of England’s North East Coast
Photo Common Name Latin Name Number of Observations
NA Austrominius modestus 25
Orange-tipped Sea Squirt Corella eumyota 19
Oyster-thief Colpomenia peregrina 14
NA Codium fragile fragile 4
Chinese Mitten Crab Eriocheir sinensis 2
Common Atlantic Slippersnail Crepidula fornicata 1
Japanese Skeleton Shrimp Caprella mutica 1
Pacific Oyster Magallana gigas 1
Japanese Wireweed Sargassum muticum 1
Non-Native Species of Northern Ireland’s coast
Photo Common Name Latin Name Number of Observations
Japanese Wireweed Sargassum muticum 310
Common Atlantic Slippersnail Crepidula fornicata 167
Beaked Barnacle Austrominius modestus 142
Dead Man’s Fingers Codium fragile fragile 135
Orange-tipped Sea Squirt Corella eumyota 117
Oyster-thief Colpomenia peregrina 115
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 76
Stalked Sea Squirt Styela clava 41
Pacific Oyster Magallana gigas 36
Japanese Skeleton Shrimp Caprella mutica 34
Red Ripple Bryozoan Watersipora subatra 25
Compass Sea Squirt Asterocarpa humilis 25
Wakame Undaria pinnatifida 24
brown bryozoan Bugula neritina 19
NA Tricellaria inopinata 19
Chain Tunicate Botrylloides violaceus 18
Orange Ripple Bryozoan Schizoporella japonica 13
NA Bispira polyomma 9
Atlantic Jackknife Ensis leei 8
NA Perophora japonica 7
NA Agarophyton vermiculophyllum 6
NA Grateloupia turuturu 6
Harpoon Weed Asparagopsis armata 6
Pom-pom weed Caulacanthus okamurae 6
Chinese Mitten Crab Eriocheir sinensis 1
Orange-striped anemone Diadumene lineata 1
NA Ficopomatus enigmaticus 1
Non-Native Species of England’s North West coast
Photo Common Name Latin Name Number of Observations
Beaked Barnacle Austrominius modestus 351
Atlantic Jackknife Ensis leei 76
Chinese Mitten Crab Eriocheir sinensis 29
Japanese Wireweed Sargassum muticum 22
Pacific Oyster Magallana gigas 11
Leathery Sea Squirt Styela clava 8
Dead Man’s Fingers Codium fragile fragile 3
Oyster-thief Colpomenia peregrina 2
Common Atlantic Slippersnail Crepidula fornicata 2
Wakame Undaria pinnatifida 2
Japanese Skeleton Shrimp Caprella mutica 1
Non-Native Species of Scotland’s coast
Photo Common Name Latin Name Number of Observations
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 1157
Japanese Skeleton Shrimp Caprella mutica 318
NA Codium fragile fragile 199
Wireweed Sargassum muticum 165
NA Austrominius modestus 154
OysterThief Colpomenia peregrina 117
Harpoon Weed Asparagopsis armata 106
Pacific oyster Magallana gigas 77
NA Schizoporella japonica 77
Leathery Sea Squirt Styela clava 53
NA Corella eumyota 42
Japanese Wireweed Sargassum muticum 39
American Slipper Limpet Crepidula fornicata 38
Orange-striped anemone Diadumene lineata 32
Jack knife clam Ensis leei 31
NA Tricellaria inopinata 30
Dead Man’s Fingers Codium fragile fragile 21
Oyster-thief Colpomenia peregrina 19
Beaked Barnacle Austrominius modestus 15
Compass Sea Squirt Asterocarpa humilis 6
NA Botrylloides violaceus 4
Pacific Oyster Magallana gigas 4
Common Atlantic Slippersnail Crepidula fornicata 3
NA Bugula neritina 2
NA Didemnum vexillum 2
Stalked Sea Squirt Styela clava 2
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 2
NA Amphibalanus amphitrite 1
Wakame Undaria pinnatifida 1
Atlantic Jackknife Ensis leei 1
Compass Sea Squirt Asterocarpa humilis 1
Chain Tunicate Botrylloides violaceus 1
Japanese Skeleton Shrimp Caprella mutica 1
Wakame Undaria pinnatifida 1
Non-Native Species of England’s South East coast
Photo Common Name Latin Name Number of Observations
Common Atlantic Slippersnail Crepidula fornicata 1669
Beaked Barnacle Austrominius modestus 646
Pacific Oyster Magallana gigas 582
Japanese Wireweed Sargassum muticum 468
Stalked Sea Squirt Styela clava 254
Devil’s Tongue Weed Grateloupia turuturu 143
Pom-pom weed Caulacanthus okamurae 82
Orange-tipped Sea Squirt Corella eumyota 77
Atlantic Jackknife Ensis leei 69
brown bryozoan Bugula neritina 67
Wakame Undaria pinnatifida 64
NA Tricellaria inopinata 45
Australian Tubeworm Ficopomatus enigmaticus 41
Oyster-thief Colpomenia peregrina 40
Hilgendorf’s Sea Spider Ammothea hilgendorfi 39
NA Didemnum vexillum 39
San Diego Sea Squirt Botrylloides diegensis 37
Green Sea Fingers Codium fragile fragile 31
Asian Date Mussel Arcuatula senhousia 30
American Sting Winkle Urosalpinx cinerea 30
Chinese Mitten Crab Eriocheir sinensis 29
Brush-clawed Shore Crab Hemigrapsus takanoi 26
NA Hydroides ezoensis 23
Harpoon Weed Asparagopsis armata 21
NA Botrylloides violaceus 17
Red Ripple Bryozoan Watersipora subatra 14
Japanese Skeleton Shrimp Caprella mutica 12
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 9
Orange-striped anemone Diadumene lineata 9
NA Amphibalanus amphitrite 7
Compass Sea Squirt Asterocarpa humilis 5
Colonial Sea Squirt Perophora japonica 5
NA Bispira polyomma 1
Blue Crab Callinectes sapidus 1
Non-Native Species of the South West Coast
Photo Common Name Latin Name Number of Observations
Japanese Wireweed Sargassum muticum 2043
Beaked Barnacle Austrominius modestus 1784
Common Atlantic Slippersnail Crepidula fornicata 1262
Pacific Oyster Magallana gigas 1036
Harpoonweed Asparagopsis armata 920
Oyster-thief Colpomenia peregrina 750
Stalked Sea Squirt Styela clava 408
Red Ripple Bryozoan Watersipora subatra 373
Wakame Undaria pinnatifida 307
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 280
Orange-tipped Sea Squirt Corella eumyota 208
Devil’s Tongue Weed Grateloupia turuturu 157
Dead Man’s Fingers Codium fragile fragile 134
brown bryozoan Bugula neritina 96
NA Tricellaria inopinata 96
San Diego Sea Squirt Botrylloides diegensis 74
Compass Sea Squirt Asterocarpa humilis 74
Chain Tunicate Botrylloides violaceus 63
NA Perophora japonica 60
Striped Green Sea Anemone Diadumene lineata 50
Pom-pom weed Caulacanthus okamurae 45
Japanese Skeleton Shrimp Caprella mutica 21
Asian Mussel Arcuatula senhousia 15
Australian Tubeworm Ficopomatus enigmaticus 13
NA Hesperibalanus fallax 11
Carpet Sea Squirt Didemnum vexillum 10
NA Amphibalanus amphitrite 8
NA Ammothea hilgendorfi 6
NA Botryocladia wrightii 3
American Sting Winkle Urosalpinx cinerea 3
Chinese Mitten Crab Eriocheir sinensis 2
NA Schizoporella japonica 2
Pacific transparent sea squirt Ciona savignyi 1
NA Agarophyton vermiculophyllum 1
Asian Shore Crab Hemigrapsus sanguineus 1
Jack knife clam Ensis leei 1
Non-Native Species of the Welsh Coast
Photo Common Name Latin Name Number of Observations
NA Austrominius modestus 3445
American Slipper Limpet Crepidula fornicata 737
Wireweed Sargassum muticum 299
NA Corella eumyota 188
Leathery Sea Squirt Styela clava 182
Beaked Barnacle Austrominius modestus 91
Pacific oyster Magallana gigas 86
OysterThief Colpomenia peregrina 79
Common Atlantic Slippersnail Crepidula fornicata 77
Japanese Wireweed Sargassum muticum 74
Orange-striped anemone Diadumene lineata 52
NA Grateloupia turuturu 40
Pom-pom weed Caulacanthus okamurae 39
Pacific Oyster Magallana gigas 30
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 22
NA Ficopomatus enigmaticus 20
Jack knife clam Ensis leei 20
Green Sea Fingers Codium fragile fragile 15
NA Botrylloides violaceus 14
Wakame Undaria pinnatifida 12
NA Bugula neritina 11
Oyster-thief Colpomenia peregrina 11
Chinese Mitten Crab Eriocheir sinensis 10
NA Tricellaria inopinata 9
NA Didemnum vexillum 8
NA Schizoporella japonica 7
NA Hesperibalanus fallax 6
Harpoon Weed Asparagopsis armata 6
NA Agarophyton vermiculophyllum 5
Compass Sea Squirt Asterocarpa humilis 5
Dead Man’s Fingers Codium fragile fragile 5
Colonial Sea Squirt Perophora japonica 4
NA Watersipora subatra 4
Orange-tipped Sea Squirt Corella eumyota 4
Atlantic Jackknife Ensis leei 4
Chinese Mitten Crab Eriocheir sinensis 3
Stalked Sea Squirt Styela clava 3
NA Botrylloides diegensis 2
Japanese Skeleton Shrimp Caprella mutica 2
Red Ripple Bryozoan Watersipora subatra 2
NA Perophora japonica 2
NA Amphibalanus amphitrite 1
NA Dyspanopeus sayi 1
Asian Shore Crab Hemigrapsus sanguineus 1
Striped Green Sea Anemone Diadumene lineata 1
San Diego Sea Squirt Botrylloides diegensis 1
Japanese Skeleton Shrimp Caprella mutica 1
Non-Native Species of the Yorkshire and Humber coast
Photo Common Name Latin Name Number of Observations
Beaked Barnacle Austrominius modestus 124
Chinese Mitten Crab Eriocheir sinensis 17
Common Atlantic Slippersnail Crepidula fornicata 8
Oyster-thief Colpomenia peregrina 7
NA Corella eumyota 4
Atlantic Jackknife Ensis leei 2
Pacific oyster Magallana gigas 2
Wireweed Sargassum muticum 2
Bonnemaison’s Hook Weed Bonnemaisonia hamifera 1
NA Tricellaria inopinata 1