Summary for Rhysodromus fallax (Araneae)

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National Distribution

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Philodromus fallax Copyright: Richard Gallon
Identification difficulty rating: 3
Name: Rhysodromus fallax
Authority: (Sundevall, 1833)
Order: Arachnida: Araneae
Family: Philodromidae
BAP status: UKBAP
National Rarity status: NR
IUCN status: VU, criteria: B2ab(ii,iv)

Records: 117
First Record: 1899
Latest Record: 2021

1992-on hectads: 18
Pre-1992 hectads: 24
Total hectads: 32

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About this species

Recorded altitude range
0m to 15m

Species text

The species is widespread on the coasts of England and Wales. It is fairly widespread in western and central Europe as far north as Sweden where it is included in their Red List (Gärdenfors 2000), but has not been recorded from Ireland.

Habitat and ecology
The spider occurs on coastal sand dunes, especially on fore-dunes, on sand or among marram, where it is camouflaged to match the sand. Males are adult in April and May, females from late April to June. The female deposits her eggs in a cocoon in the sand at the base of marram.

UK Biodiversity Action Plan priority species. The spider is never particularly common and rather local on sand dunes. It appears to have undergone major long-term decline of over 60%.

Public pressure is a threat at many dune systems, but as it occurs mainly on fore-dunes there may be a lower threat from agriculture or golf-course developments.

Management and conservation
Protect sand dunes from excessive public pressure, especially that associated with use of off-road vehicles.

Text based on Dawson, I.K., Harvey, P.R., Merrett, P. & Russell-Smith, A.R. (in prep.).  References

Adult Season

Adult Season Data (based on 28 records with adult season information)


background methodology

Broad Habitat Data (based on 30 records with habitat information)

no subhabitat data available

Structural Habitat Data (based on 25 records with structural habitat information)

Habitat Detail and Method (based on 21 records with habitat detail and method information)

Recorded management for locations with Rhysodromus fallax

Recorded substrate and hydrology for locations with Rhysodromus fallax


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