The Complete Guide to British Ladybird Species
Ladybirds are among the most beloved and recognisable insects in Britain. Belonging to the family Coccinellidae, they are small, dome-shaped beetles most famous for their bright colours and spotted patterns. The UK is home to 46 species of Coccinellidae, of which 26 are conspicuous ladybirds (the remainder are the smaller, less familiar “inconspicuous” species). This guide covers the identification, ecology, and conservation of Britain's most important ladybird species.
Why Are Ladybirds Brightly Coloured?
The vivid red, orange, or yellow colouration of ladybirds is a form of aposematic (warning) colouration. It signals to predators that the insect is distasteful. When threatened, ladybirds exude drops of toxic, foul-smelling alkaloid-rich haemolymph (blood) from their leg joints—a defence mechanism called reflex bleeding. Birds quickly learn to associate the bright colours with an unpleasant experience and avoid ladybirds.
The Most Common British Ladybird Species
| Species | Spots | Base Colour | Size | Habitat |
|---|---|---|---|---|
| 7-spot (Coccinella septempunctata) | 7 black spots | Red | 5–8 mm | Gardens, hedgerows, meadows |
| 2-spot (Adalia bipunctata) | 2 black spots (typical form) | Red (or black with red spots) | 4–5 mm | Gardens, trees, urban areas |
| 10-spot (Adalia decempunctata) | Highly variable (0–15 spots) | Orange, red, or brown | 3.5–4.5 mm | Trees and hedgerows |
| 14-spot (Propylea quatuordecimpunctata) | 14 rectangular black spots | Yellow | 3.5–4.5 mm | Gardens, grassland, hedgerows |
| 22-spot (Psyllobora vigintiduopunctata) | 22 round black spots | Bright yellow | 3–4 mm | Grassland, hedgerows (feeds on mildew) |
| Harlequin (Harmonia axyridis) | Extremely variable | Red, orange, or black | 5–8 mm | Ubiquitous; all habitats |
| Cream-spot (Calvia quatuordecimguttata) | 14 cream spots | Maroon-brown | 4–5 mm | Deciduous woodland |
| Eyed ladybird (Anatis ocellata) | 15+ black spots with yellow halos | Red | 7–8.5 mm | Coniferous woodland |
| Pine ladybird (Exochomus quadripustulatus) | 4 red spots (comma-shaped) | Black | 3–5 mm | Conifers, hedgerows |
| Orange ladybird (Halyzia sedecimguttata) | 12–16 white spots | Orange | 4.5–6 mm | Deciduous trees (feeds on mildew) |
The Harlequin Ladybird
The harlequin ladybird (Harmonia axyridis) deserves special attention. Native to Asia, it was introduced to North America and Europe as a biological control agent for aphids. It was first recorded in the UK in 2004 and has since become one of the most abundant ladybird species in Britain.
Why Is the Harlequin a Problem?
- Competition – Harlequins are larger and more aggressive than most native species, outcompeting them for aphid prey.
- Intraguild predation – Harlequin larvae readily eat the eggs, larvae, and pupae of other ladybird species.
- Disease transmission – Harlequins carry a parasitic fungus (Laboulbeniales) and a microsporidian pathogen that can infect native ladybirds.
- Declines in native species – Since the harlequin's arrival, populations of the 2-spot ladybird have declined by over 40% in the UK, and several other species have also been affected.
Did you know? The harlequin ladybird is one of the most variable insects in the world, with over 100 recorded colour forms. It can be red with black spots, black with red spots, orange with no spots, or almost any combination in between. This extreme variability makes identification challenging, but the large size (5–8 mm) and distinctive M- or W-shaped marking on the pronotum (the shield behind the head) are useful identification features.
Lifecycle
All British ladybirds undergo complete metamorphosis:
1. Eggs – Bright yellow or orange, laid in clusters of 10–50 on leaves near aphid colonies. Eggs hatch in 4–10 days.
2. Larvae – Ladybird larvae look nothing like adults. They are elongated, dark-coloured, and often spiny, resembling tiny alligators. Larvae are voracious predators of aphids—a single 7-spot ladybird larva may consume over 350 aphids during its development. The larval stage lasts 2–4 weeks through four instars.
3. Pupae – The larva attaches itself to a leaf or stem and pupates. The pupa is typically orange or yellow with dark markings and remains immobile for 7–10 days.
4. Adults – Newly emerged adults are soft and pale, darkening over several hours as the exoskeleton hardens. Most species produce one or two generations per year in the UK. Adults hibernate through winter, often in large aggregations in sheltered locations such as leaf litter, bark crevices, and window frames.
Ecology and Diet
Most British ladybirds are predators of aphids and other soft-bodied insects (scale insects, whiteflies, mites). A single adult 7-spot ladybird can consume over 5,000 aphids in its lifetime, making ladybirds among the most valuable natural pest controllers in gardens and agriculture.
However, not all ladybirds are aphid specialists:
- The 22-spot and orange ladybird feed on plant mildews rather than insects.
- The kidney-spot ladybird (Chilocorus renipustulatus) feeds on scale insects on tree bark.
- The 24-spot ladybird (Subcoccinella vigintiquatuorpunctata) is herbivorous, feeding on campion and related plants.
Conservation
Several factors are affecting British ladybird populations:
- Harlequin invasion – As described above, the harlequin is impacting native species through competition, predation, and disease.
- Habitat loss – Agricultural intensification reduces the hedgerows, field margins, and diverse vegetation that ladybirds depend on.
- Pesticide use – Insecticides aimed at aphids also kill the ladybirds that feed on them.
- Climate change – Altering the seasonal timing of aphid populations and ladybird emergence.
The UK Ladybird Survey
The UK Ladybird Survey, run by the Centre for Ecology & Hydrology, encourages the public to report ladybird sightings online. This citizen-science project has been instrumental in tracking the spread of the harlequin ladybird and monitoring changes in native species populations. Photographs submitted by the public are verified by experts and contribute to published scientific research.
Key Takeaway
Britain's 26 conspicuous ladybird species are among our most familiar and ecologically important beetles. Most are predators of aphids, providing invaluable natural pest control in gardens and farmland. The arrival of the invasive harlequin ladybird in 2004 has significantly impacted native species, making continued monitoring through the UK Ladybird Survey more important than ever. Learning to identify ladybird species—starting with the common 7-spot, 2-spot, and harlequin—is a rewarding and accessible entry point into the world of entomology.