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Freshwater Invertebrate Species

Information about different types of freshwater invertebrate species occuring in the UK.

This lists includes all the types of invertebrates occurring in rivers, streams, ditches, ponds, lakes and groundwater.

Italics = groups that are non-native, but established in the UK.
Bold = Phylum (and subphylum)
Normal font = Class
Indented font = Order
Double indent = Sub order

How to find your way around: below is a list of types of freshwater invertebrates in Britain. The names are given both in Latin and in English. See the PDF Freshwater Invertebrates for information about some of the most popular species - including mayflies, dragonflies, stoneflies and caddisflies. Some freshwater invertebrates also live part of their life cycle as terrestrial invertebrates so they may be filed under ‘terrestrial invertebrates’ in the navigation bar.

Protozoa

Porifera
Demospongiae (common sponges)

Cnidaria
Hydrozoa (polyps and hydras)
Scyphozoa (jellyfish)

Platyhelminthes (flatworms)
Turbellaria (free-living flatworms)
Monogenea (flukes)
Trematoda (flukes)
Cestoda (tapeworms)

Gastrotricha (gastrotrichans)

Nemertea/Nemertini (ribbon and bootlace worms)

Nematoda (round-worms)

Cephalorhyncha
Nematomorpha (horsehair worms)

Rotifera (wheel animalcules)
Bdelloidea
Monogononta

Annelida (segmented worms)
Clitellata
Oligochaeta (earthworms and oligochaete worms)
Hirudinea (leeches)

Mollusca
Gastropoda (snails)
Bivalvia (bivalves)

Arthropoda
Crustacea

•Branchiopoda (tadpole shrimps, water fleas, etc.)
•Branchiura (fish lice)
•Copepoda (copepods)
•Ostracoda (ostracods)
•Malacostraca ◦Decapoda (crabs and lobsters)
◦Isopoda (isopods)
◦Amphipoda (shrimps)
◦Bathynellacea

•Mysidacea (opossum shrimps or mysids)

Chelicerata

•Arachnida ◦Aranea (spiders)
◦Acariformes (mites)
Tardigrada (water-bears)
Pentastoma (tongue-worms)
Insecta (insects)

•Ephemeroptera (mayflies)
•Odonata (dragonflies)
•Plecoptera (stoneflies)
•Hemiptera ◦Heteroptera (true bugs)

•Coleoptera (beetles)

•Megaloptera (alderflies)
•Neuroptera (lacewings, etc.)

•Diptera (true flies)
◦Nematocera (craneflies, midges, etc)

Brachycera (hoverflies, etc.)

•Trichoptera (caddisflies)
•Lepidoptera (moths)

Bryozoa (moss animalcules)
Phylactolaemata

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