The cardinal spider, Tegenaria parietina, is a large brown spider found in parts of the UK, particularly around buildings and other sheltered places.
This guide explains its appearance, cardinal spider size, male and female differences, UK distribution and the features that help distinguish this species from similar large spiders.
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How to Identify a Cardinal Spider
The cardinal spider, Tegenaria parietina, is a large brown spider with notably long legs and a strong association with buildings. In Britain it belongs to the same broad house-spider group as several other long-legged species, so identification should rely on proportions, leg characteristics and habitat rather than colour alone.
Cardinal spiders can look imposing because the legs contribute much of their overall span. The species is particularly distinctive for the difference in leg length between mature males and females, while the web and the type of building or sheltered site can add useful context.
Cardinal Spider Size
Adult male cardinal spiders can reach a leg span of about 12 centimetres, although the body itself is far smaller. The body can reach around 20 millimetres, which is why photographs that focus only on the full leg span can make the spider appear much larger than its body measurement suggests.
Size should still be treated as supporting evidence rather than a species test. Other large brown spiders can overlap in general appearance, so leg proportions, body shape, web structure and location should be considered together.
Male and Female Cardinal Spiders
Mature male cardinal spiders have much longer legs than females of a similar body size. This difference is especially pronounced in the species, with mature males able to have legs approaching twice the length of those of females when their body sizes are comparable.
This can make males look unusually long-legged and slender, while females appear more compact and robust. The difference is useful for identification, but it is safer to compare several visible features than to assign sex or species from leg length alone.
How It Differs from Similar Large House Spiders
Cardinal spiders can be confused with other large, brown, long-legged spiders found around buildings. Tegenaria parietina is noted for especially long, hairy legs and a comparatively large sheet web, although these features should still be considered together rather than used alone.
This is one reason a cardinal spider may be mistaken for a giant house spider, although a casual photograph may not always separate similar species confidently. Use the Cardinal-specific features here alongside the broader guide to UK house spiders when the identification is uncertain.
Where Are Cardinal Spiders Found in the UK?
British records of the cardinal spider are concentrated in the southern counties of England. The species is associated with buildings, particularly older structures, but records also show that it can occur on the outside of buildings and in other sheltered vegetation or wall habitats.
That distribution is narrower than the general phrase “UK house spider” might suggest. A large spider found elsewhere in Britain should not be assumed to be a cardinal spider from size alone.
Southern England Distribution
Tegenaria parietina is widespread within its British range but is mainly recorded from southern England, excluding the extreme south-west. It is described as locally common where it occurs, so the species can be well established in suitable places without being evenly distributed across the UK.
Location therefore matters when assessing a possible identification. A sighting from within the known southern-English range is more consistent with the species than one far outside it, but distribution alone cannot confirm an individual spider.
Buildings, Webs and Sheltered Habitats
Cardinal spiders are often associated with old buildings and other sheltered structures. They produce a sheet web leading towards a tubular retreat, a web form shared with related house spiders, and the cardinal spider's sheet can be comparatively large.
The species has also been recorded on the outside of buildings and away from occupied houses, including sheltered walls and vegetation. Adults of both sexes are most often recorded in late summer and autumn, so sightings can become more noticeable during that period.
Sources: British Arachnological Society – Cardinal Spider | Natural History Museum – House Spider | British Arachnological Society – Tegenaria spp.
Frequently Asked Questions
Cardinal spiders are predators that feed on small invertebrates they can catch around their web. Their sheet-like web helps detect and intercept prey, allowing the spider to emerge from its sheltered retreat and capture it.
Female cardinal spiders can live considerably longer than adult males. In the Tegenaria house-spider group, females may live for several years, while mature males have a much shorter adult period after mating.
The name “cardinal spider” is traditionally linked to a story from Hampton Court. According to the British Arachnological Society, spiders living there were said to have frightened Cardinal Wolsey, which gave rise to the common name.
Cardinal spiders can be particularly active at night. They belong to the Tegenaria house-spider group, which is known for nocturnal activity, while adults may also be noticed wandering away from their retreats.