Great Raft Spiders

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Great Raft Spider

Scientific name:  Dolomedes plantarius

Size:  Body and head up to 23mm

Distribution:  Found in only a few locations in the UK; Redgrave and Lopham Fen in Suffolk, Pevensey Marshes in Sussex, Crymlyn Bog, and on the Tennant Canal next to Pant y Sais Fen near Swansea.  Conservationists are planning introductions to other sites.

Months seen:  April to September

Habitat:  Swampy areas with pools of water, fens, ditches and canals

Food:  Invertebrates, tadpoles and small fish

Special features:  Great Raft Spiders (Dolomedes plantarius) have a brown or black coloured body, usually with a distinctive cream coloured stripe running along both sides of the body, although this is not always present.

They are a semi-aquatic species, hunting mainly on the surface of water.  They wait on vegetation at the edge of the water with their front legs resting on the surface of the water.  When they detect vibrations, on or in the water, they grab whatever is there.  This is why they are sometimes called 'Fishing Spiders'.  They can also go underwater to catch prey.

Female Great Raft Spiders lay their eggs inside a nursery web on vegetation at the edge of the water.  When fully grown they are one of the largest spiders found in the UK.  They are a protected species due to their rarity.

Related Pages



Great Raft Spider fishing

The nursery web of the Great Raft Spider

Great Raft Spider close up showing eye arrangement





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