Insects of the UK: A Field Guide to Major Groups (22,000+ Species)

The UK hosts over 24,000 insect species—too many for a complete list, but here are the major groups you'll encounter, with representative examples:

Beetles (Coleoptera) – 4,000+ UK species

Ground beetles (Carabidae), rove beetles (Staphylinidae), ladybirds (Coccinellidae—46 spp.), weevils (Curculionidae), longhorns (Cerambycidae), glow-worms (Lampyridae), click beetles (Elateridae).

True Bugs (Hemiptera) – 1,800+ species

Aphids, shieldbugs, froghoppers, pondskaters (Gerridae), water boatmen (Corixidae), backswimmers (Notonectidae), bed bugs (Cimicidae).

Flies (Diptera) – 7,000+ species

Houseflies, bluebottles, hoverflies (Syrphidae—280 spp., key pollinators), crane flies, midges, mosquitoes, horseflies.

Bees, Wasps, Ants (Hymenoptera) – 7,000+ species

Honeybee (1 sp.), bumblebees (24 spp.), solitary bees (~250 spp.), social wasps (9 spp.), hornets, ants (50+ spp. including wood ants, yellow meadow ants).

Butterflies & Moths (Lepidoptera)

Butterflies: 59 resident species (Red Admiral, Peacock, Small Tortoiseshell, Painted Lady, Brimstone, whites).
Moths: 2,500+ species (Hawk-moths, Tiger moths, Peppered Moth, Ghost Moth).

Dragonflies & Damselflies (Odonata) – 46 species

Emperor Dragonfly, Southern/Brown Hawkers, Common Darter, Banded Demoiselle, Large Red Damselfly, Azure Damselfly.

Orthoptera & Allies – 30+ species

Grasshoppers (Field, Meadow), crickets (Field, House), bush-crickets, groundhoppers, earwigs.

Resources for Identification

• iRecord / iNaturalist UK – citizen science apps
• Buglife.org.uk – conservation charity
• Royal Entomological Society – keys and guides
• "Britain's Insects" (WildGuides) – best photo field guide

Habitat loss, pesticides, climate change, and light pollution threaten many UK insects. Recording sightings helps conservation.