consideration of the species. The scores were used for guidance only and should be viewed with caution, the discussions within and between thematic group experts provided the context of the scores and enabled the initial ranking (which were subsequently reviewed and moderated) of the species. These initial scores represent those provided in the preliminary assessment prior to the workshop (see ticks in Final List, Day 2, Day 1 and Preliminary columns for the point at which the species were included within the process) the scores listed below were the scores attributed at the first stage that the species was included for consideration. Following review through the consensus process the scores were altered, therefore the scores here and those in Table 5.1 are not the same. The scores in Table 5.1, while also for guidance only, were the final scores from the consensus following review and moderation through expert discussions. However, the final ranking of the species was
determined by consensus through discussions across all thematic groups; the scores were not altered and so do not reflect the final rank. Some of the cells remain blank because many of the species were only included in preliminary stages and because of the number of species and time constraints the experts were unable to provide all this information for species that were subsequently removed from consideration.
Freshwater invertebrates
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Limnoperna
fortunei Golden
mussel Bivalve
mollusc Herb As No 625 H
Orconectes
rusticus Rusty
crayfish Crustacean Omni NAm No 625 H
Orconectes virilis Virile crayfish Crustacean Omni NAm Yes 500 H
Procambarus fallax forma virginalis
Marmokrebs Crustacean Omni NAm Yes 250 H
188
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Cherax
destructor Common
yabby Crustacean Omni Aus Yes 200 H
Pomacea canaliculata
Golden apple snail
Gastropod mollusc
Herb SAm Yes 180 H
Pomacea
maculata Giant apple
snail Gastropod
mollusc Herb SAm Yes 180 H
Argulus japonicus Japanese
fishlouse Crustacean Pred AT Yes 150 M
Marissa
cornuarietis South American giant ramshorn snail
Gastropod
mollusc Omni SAm Yes 135 M
Cherax
quadricarinatus Redclaw
crayfish Crustacean Omni Aus Yes 108 M
Gammarus
fasciatus Freshwater
shrimp Crustacean Omni NAm No 108 M
Bellamya chinensis
Chinese mysterysnail
Gastropod mollusc
Herb As Yes 100 M
Daphnia
lumholtzi Water flea Crustacean Herb As, AT, Aus No 96 M
Cherax
tenuimanus Hairy marron Crustacean Omni Aus Yes 90 L
189
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Culex
quinquefasciatus Southern house mosquito
Insect Omni NAm Yes 90 M
Orconectes
obscurus Allegheny
crayfish Crustacean Omni NAm No 60 M
Skistodiaptomus
pallidus Copepod Crustacean Herb NAm Yes 45 M
Melanoides
tuberculatus Red-rim
melania Gastropod
mollusc Herb AT, Afr Yes 40 M
Anopheles
quadrimaculatus
Malaria mosquito
Insect Omni NAm No 32 M
Viviparus georgianus
Banded mysterysnail
Gastropod mollusc
Omni NAm No 24 M
Lophodella carteri Bryozoan Bryozoan Omni As Yes 20 L
Bellamya
japonica Japanese
mysterysnail Gastropod
mollusc Herb As No 18 L
Cyrtobagous
salviniae Salvinia
weevil Insect Herb SAm No 8 M
Elimia virginica Virginia river snail
Gastropod mollusc
Omni NAm No 4 L
Gillia altilis Buffalo
pebblesnail Gastropod
mollusc Omni NAm No 2 M
190
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Lasmigonia
subviridis Green floater Bivalve
mollusc Omni NAm No 2 L
Freshwater fish
Species
Common name
Taxonomic group
Functional group
Native distribution
Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Gambusia affinis Western
mosquitofish Fish Omni NAm Yes 475 M
Micropterus
dolomieu Smallmouth
bass Fish Pred NAm Yes 405 H
Channa argus Northern
snakehead Fish Pred AT No 383 H
Oreochromis mossambicus
Mossambiqu e tilapia
Fish Omni Afr Yes 363 H
Oreochromis
aureus Blue tilapia Fish Omni Afr Yes 322 H
Fundulus
heteroclitus Mummichog Fish Omni NAm Yes 293 H
Oreochromis
niloticus Nile tilapia Fish Omni Afr Yes 288 M
191
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary Misgurnus
anguillicaudatus Oriental
weatherfish Fish Omni AT Yes 277 H
Cyprinella lutrensis
Red shiner Fish Omni NAm Yes 227 M
Morone
americana White perch Fish Pred NAm No 221 M
Hypostomus
plecostomus Suckermouth
catfish Fish Herb SAm Yes 215 M
Umbra pygmaea Eastern
mudminnow Fish Omni NAm Yes 208 H
Tilapia zillii Redbelly
tilapia Fish Omni Afr Yes 195 H
Tilapia mariae Spotted
tilapia Fish Omni Afr No 162 M
Monopterus albus Swamp eel Fish Omni AT No 148 M
Ameiurus catus White catfish Fish Omni NAm Yes 138 M
Pimephales prom elas
Fathead minnow
Fish Omni NAm Yes 135 M
Catostomus commersonii
White sucker Fish Omni NAm Yes 120 L
Misgurnus
mizolepis Chinese
weather Fish Omni AT Yes 71 M
192
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
(= Phoxinus eos) Redbelly
dace Fish Omni NAm No 26 L
Terrestrial invertebrates
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
planipennis Emerald ash
borer Coleoptera,
Buprestidae Xylo As No 457
Aethina tumida Small hive beetle
triangulatus New Zealand
flatworm Platyhelmin-thes:
Tricladida
Pred Aus Yes 243
Agrilus anxius Bronze birch borer
Coleoptera, Buprestidae
Xylo NAm No 211
193
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
invicta Red imported
fire ant Hymeno-ptera, Formicidae
Omni SAm No 209
Pachycondyla
chinensis Asian needle
ant
Hymeno-ptera, Formicidae
Omni As No 181
Tetropium
gracilicorne Fine-horned
spruce beetle Coleoptera,
agrestis Crazy snake
worm Annelida:
Oligochaeta As? No 142
Polygraphus
proximus Sakhalin-fir
bark beetle Coleoptera,
Scolytidae Xylo As No 134
194
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
richteri Black
imported fire
Popillia japonica Japanese
beetle Coleoptera,
Scolytidae Herb As Yes 121
Saperda candida
Round-headed apple
crassiusculus Granulate ambrosia
Aeolesthes sarta City longhorn beetle, Qetta
pensylvanica Western
yellowjacket Hymeno-ptera, Vespidae
Omni NAm No 99
Dendroctonus
ponderosae Mountain
pine beetle Coleoptera,
compactus Shot-hole
borer Coleoptera,
Curculion- Herb As, AT Yes 91
195
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
sibiricus Siberian silk
moth Lepidoptera, Lasiocamp-idae
Herb As No 87
Platypus
quercivorus Oak ambrosia beetle
Coleoptera,
Platypodidae Xylo As No 87
Wasmannia
auropunctata Little fire ant Hymeno-ptera, Formicidae
Omni SAm No 84
Megaplatypus
mutatas Grand forest
borer Coleoptera,
Platypodidae Herb SAm Yes 83
Sirex ermak Blue-black
horntail Hymeno-ptera, Siricidae
Herb As No 82
Agrilus
auroguttatus Goldspotted
oak borer Coleoptera,
Buprestidae Xylo NAm No 81
Dendrolimus
superans White-lined
silk moth Lepidoptera, Lasiocamp-idae
Herb As No 78
Malacosoma
disstria Forest tent
caterpillar Lepidoptera, Lasiocamp-idae
Nam No 76
Dendroctonus
rufipennis Spruce
beetle Coleoptera,
Curculion- Xylo NAm No 75
196
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
antennalis Asian paper
wasp
Hymeno-ptera, Vespidae
Pred As No 72
Culex
quinquefasciatus Southern house mosquito
Diptera Pred NAm No 67
Platydemus
manokwari New Guinea
flatworm Platyhelmin-thes,
Tricladida
Aus Yes 64
Scolytus
schevyrewi Banded elm
bark beetle Coleoptera,
Scolytidae Herb As No 62
Adelges tsugae Hemlock woolly adelgid
Hemiptera,
Adelgidae As No 60
Xylosandrus
mutilatus Camphor
shoot beetle Coleoptera, Curculion-idae
Xylo As, AT No 59
Polygyra cereolus Southern
flatcoil Gastropoda,
Polygyridae Herb SAm Yes 53
Lissachatina
fulica Giant African
snail Gastropoda,
Achatinidae Herb Afr No 42
Bradybaena
similaris Asian
trampsnail Gastropoda, Bradybaen-idae
Herb tropical No 36
197
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU? Hylobitelus xiaoi Chinese
large pine
geometricus Black widow
spider Araneae,
Theridiidae Pred SAm No 32
Latrodectus
hasselti Black widow
spider Araneae,
Theridiidae Pred Aus No 30
Diaphorina citri Asian citrus
psyllid Hemiptera,
Liviidae Herb AT? No 27
mactans Black widow
spider Araneae,
Theridiidae Pred NAm No 23
Coptotermes
formosanus Formosan
Achatina achatina Giant Ghana snail
Gastropoda, Achatinidae
Herb Afr No 18
Archachatina
marginata Giant West
African snail Gastropoda,
Achatinidae Herb Afr No 18
Limicolaria
aurora Nigerian land
snail Gastropoda,
Achatinidae Herb Afr No 18
Heteropoda Huntsmen Araneae, Pred Yes 17
198
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary venatoria spider Sparassidae
Phoneutria fera Brazilian wandering spider
Araneae,
Ctenidae Pred SAm No 10
Loxosceles sp. Brown recluse spider
Araneae,
Sicariidae Pred SAm No 5
Vertebrates
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary
Axis axis Axis deer Mammals Herb As Yes 625
Castor canadensis
American beaver
Mammals Herb NAm Yes 625
Cervus nippon Sika deer Mammals Herb As Yes 625
Corvus splendens House Crow Birds Omni As Yes 625
Herpestes Egyptian Mammals Pred Afr No 625
199
Species Common
name Taxonomic
group Functional
group Native
distribution Already
present in EU?
Initial Overall impact on biodiversity score (A*B*C*D)
Confidence in Overall score
(H,M,L) Final List Day 2 Day 1 Preliminary ichneumon mongoose
Xenopus laevis African
clawed frog Amphibians Pred Afr Yes 563
Pycnonotus cafer Red-vented
bulbul Birds Omni As Yes 506
Pycnonotus
jocosus
Red-whiskered bulbul
Birds Omni As Yes 506
Acridotheres tristis
Common myna
Birds Omni As Yes 500
Callosciurus
erythraeus Pallas's
squirrel Mammals Herb AT Yes 500
Callosciurus
finlaysonii Finlayson's
squirrel Mammals Herb AT Yes 500
Acridotheres
cristatellus Crested
myna Birds Omni As Yes 450
Lampropeltis getula
Common kingsnake
Reptiles Pred NAm Yes 400
Muntiacus
reevesi Reeve's
muntjac Mammals Herb As Yes 400
Herpestes
auropunctatus Small Indian
mongoose Mammals Pred AT Yes 375
Nasua nasua Coati Mammals Omni SAm Yes 375