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The Raft Spider – Britain’s largest spider

In fact two spiders qualify for this title, but they are so similar that only experts can tell them apart: Dolomedes plantarius and Dolomedes frimbiatus – the Raft Spiders. The females can span an impressive 7 cm, from leg-tip to leg-tip, with a body of up to 22mm. The males, as usual in spiders, are notably smaller, with a body of 10 -13mm.

Chocolate brown, with creamy white stripes, Raft Spiders live in watery habitats, typically fens and marshes.  They are found at the water’s edge, resting their legs on the surface. Vibrations in surface tension inform them about what’s happening in their vicinity. Continue reading The Raft Spider – Britain’s largest spider