Strandline Beetle

Fast Facts

Latin name: Eurynebria complanata

Notable feature: A large, sandy coloured beetle with black markings on the elytra. Can be found sheltering underneath beach debris.

Conservation Status: Endangered

Where in the UK: Historically found at sites on both the Welsh and English sides of the Bristol Channel but now only found on a few beaches in South Wales.

Strandline Beetle (Eurynebria complanata) © Liam Olds

The Strandline Beetle (Eurynebria complanata), sometimes known as the Beachcomber Beetle, is a large, fast-moving and striking ground beetle, measuring between 16 and 20mm in length.

It is sandy coloured with black markings on its elytra, well camouflaged for life in or near the tidal zone, on bare sand or sandy clay.

The Strandline Beetle has long antennae and legs and large eyes positioned either side of its head, just behind the antennae

  • Size: Adults can be 16-23mm in length
  • Life span: Unknown
  • Diet:  Adults feed primarily on sandhoppers such as Talitus saltator and Talorchestia brito, although beetle and fly larvae may also be eaten.
  • Reproduction:  Mating occurs in late summer and autumn with females laying single eggs beneath the sand above the strandline. New adults emerge from the following spring.
  • When to see:  Adults can be found between May and October each year.
  • Population Trend:  Declining in the UK – the Strandline Beetle is classed as Endangered on the GB IUCN Red List
  • Threats:  Loss of habitat as a result of beach cleaning, removal of drift wood and other beach debris and climate change. Disturbance as a result of tourism.
  • Fun Fact:  Strandline Beetles are nocturnal and spend their days sheltering under beach debris such as driftwood.  They have also been found underneath some more unusual items including oil drums and old wellies.

How you can help: 

Buglife is working to increase awareness of invertebrates and the Strandline Beetle through specific projects, such as Natur am Byth!, Strandline Beetles in England and campaigns, but we need your help!

If you have seen a Strandline Beetle whilst on any of the beaches in north Devon, Cornwall or Somerset and have a photo of it, we would love it if you could share it with us. Join our Search for the Strandline Beetle!

Do remember that we rely on donations to continue our work.  If you have searched, found and learnt about our incredible invertebrates on our website, please do consider Making a DonationBecoming a Member or maybe even making a purchase in our shop.  For more ideas on how to support our work find out how to Get Involved.  Thank you 🕷