Terrestrial Invertebrates

Great green bush-cricket (c) Steven Falk

Information about invertebrates, including how many there are in Britain, what is an invertebrate and what different types or species of invertebrates exist.

Types of Terrestrial Invertebrates in Britain

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 long list of types of terrestrial (i.e. living on land) invertebrates in Britain. The names are given both in Latin and in English. For a PDF containing information on all species listed below, see Terrestrial Invertebrates.


Platyhelminthes (flatworms)

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

Nematoda (round-worms)

Nematomorpha (horsehair worms)

Annelida (segmented worms)

•Oligochaeta (earthworms and oligochaete worms)
•Hirudinea (leeches)

Gastropoda (snails and slugs)


•Isopoda (woodlice)
•Amphipoda (sand-hoppers)


◦Scorpiones (scorpions)
◦Aranea (spiders)
◦Opiliones (harvestmen)
◦Pseudoscorpiones (pseudoscorpions)
◦Parasitiformes (ticks)
◦Acariformes (mites)


•Chilopoda (centipedes)
•Diplopoda (millipedes)
•Symphyla (symphylans)
•Pauropoda (pauropods)

•Diplura (diplurans)

•Collembola (springtails)

•Protura (proturans)

•Thysanura (silver-fish)

•Microcoryphia (bristletails)

•Ephemeroptera (mayflies)

•Odonata (dragonflies)

•Plecoptera (stoneflies)

•Blattaria (cockroaches)

•Dermaptera (earwigs)

•Orthoptera (grasshoppers and crickets)

•Phasmida (stick insects)

•Psocoptera (booklice)

•Mallophaga (biting lice)

•Anoplura (sucking lice)

•Thysanoptera (thrips)

◦Heteroptera (true bugs)
◦Homoptera (aphids, cicadas, etc.)

Coleoptera (beetles)

•Strepsiptera (stylopids)
•Hymenoptera ◦Symphyta (sawflies)

◦Parasitica (parasitic wasps)

◦Aculeata (bumblebees, bees, wasps and ants)

•Raphidioptera (snakeflies)

•Neuroptera (ant-lions, lacewings, etc.)

•Megaloptera (alderflies)

•Mecoptera (scorpionflies)

•Diptera (true flies)

◦Nematocera (craneflies, midges, etc.)

◦Brachycera (hoverflies, etc.)
•Siphonaptera (fleas)
Trichoptera (caddisflies)
Lepidoptera (moths and butterflies)

Pentastoma (tongue-worms)

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