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Lifeforms
- Insects (2,414)
- Plants (1,188)
- Crustaceans (374)
- Worms (230)
- Fungi (182)
- Birds (153)
- Molluscs (99)
- Fishes (98)
- Amphibians (33)
- Chromista (30)
- Mammals (8)
- Reptiles (8)
- Myriapods (6)
- Spiders and allies (2)
Taxon group
- insect - true fly (Diptera) (1,540)
- flowering plant (664)
- rotifer (470)
- insect - beetle (Coleoptera) (415)
- crustacean (374)
- moss (312)
- acarine (Acari) (254)
- insect - caddis fly (Trichoptera) (203)
- lichen (181)
- bird (156)
- liverwort (146)
- annelid (119)
- mollusc (99)
- bony fish (Actinopterygii) (95)
- insect - true bug (Hemiptera) (69)
- flatworm (Turbellaria) (58)
- insect - dragonfly (Odonata) (57)
- insect - mayfly (Ephemeroptera) (53)
- roundworm (Nematoda) (47)
- waterbear (Tardigrada) (41)
- insect - stonefly (Plecoptera) (35)
- amphibian (33)
- stonewort (32)
- insect - hymenopteran (26)
- diatom (23)
- springtail (Collembola) (22)
- fern (16)
- gastrotrich (12)
- bryozoan (11)
- reptile (11)
- insect - moth (9)
- horsetail (8)
- terrestrial mammal (8)
- protozoan (7)
- alga (6)
- coelenterate (=cnidarian) (6)
- millipede (5)
- sponge (Porifera) (5)
- hairworm (Nematomorpha) (4)
- insect - lacewing (Neuroptera) (4)
- insect - alderfly (Megaloptera) (3)
- jawless fish (Agnatha) (3)
- chromist (2)
- clubmoss (2)
- quillwort (2)
- ribbon worm (Nemertea) (2)
- spider (Araneae) (2)
- centipede (1)
- cyanobacterium (1)
- foraminiferan (1)
- fungus (1)
Establishment means
- Native (5,302)
- Non-native (354)
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Ampullaceana balthica – Wandering Snail
Species, Mollusc, Freshwater
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Amygdalaria pelobotryon
Species, Lichen, Freshwater
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Anabolia brevipennis
Species, Insect - caddis fly (Trichoptera), Freshwater, terrestrial
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Anabolia nervosa
Species, Insect - caddis fly (Trichoptera), Freshwater, terrestrial
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Anacaena bipustulata
Species, Insect - beetle (Coleoptera), Freshwater, terrestrial
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Anacaena globulus
Species, Insect - beetle (Coleoptera), Freshwater, terrestrial
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Anacaena limbata
Species, Insect - beetle (Coleoptera), Freshwater, terrestrial
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Anacaena lutescens
Species, Insect - beetle (Coleoptera), Freshwater, terrestrial
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Anaciaeschna isoceles – Norfolk Hawker
Species, Insect - dragonfly (Odonata), Freshwater, terrestrial
Green-eyed Hawker, Norfolk Aeshna, Gwas Neidr Llygadwyrdd, Gweision Neidr Llygadwyrdd
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Anagallis tenella – Bog Pimpernel
Species, Flowering plant, Freshwater
Brathlys Wridog y Gors, Gwlyddyn-Mair y Gors, Gwlyddyn Mair y Gors, Gwlydd Mair y Gors
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Anagrus incarnatus
Species, Insect - hymenopteran, Freshwater, terrestrial
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Anas acuta – Pintail non-native
Species, Bird, Freshwater, terrestrial
Northern Pintail, lachan-stiùireach, lach-stiùireach, Hwyaden Lostfain, Hwyaid Llostfain
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Anas crecca – Teal
Species, Bird, Freshwater, terrestrial
Common Teal, Eurasian Teal, lachan bheaga, crann-lach, crann-lachan, lach bheag, Corhwyaden, Corhwyaid
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Anas platyrhynchos – Mallard
Species, Bird, Freshwater, marine, terrestrial
Domestic Duck, Mallard Duck, lachan breaca, tunnag fhiadhaich, lach bhreac, lach riabhach, Hwyaden Wyllt, Hwyaid Gwyllt
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Anasimyia contracta
Species, Insect - true fly (Diptera), Freshwater, terrestrial
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Anasimyia interpuncta
Species, Insect - true fly (Diptera), Freshwater, terrestrial
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Anasimyia lineata
Species, Insect - true fly (Diptera), Freshwater, terrestrial
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Anasimyia lunulata
Species, Insect - true fly (Diptera), Freshwater, terrestrial
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Anasimyia transfuga
Species, Insect - true fly (Diptera), Freshwater, terrestrial
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Anatopynia plumipes
Species, Insect - true fly (Diptera), Freshwater, terrestrial