Summary for Rugathodes instabilis (Araneae)

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National Distribution

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Rugathodes instabilis adult male Copyright: Esmond Brown
Identification difficulty rating: 3
Name: Rugathodes instabilis
Authority: (O.P.-Cambridge, 1871)
Order: Arachnida: Araneae
Family: Theridiidae
National Rarity status: NS
IUCN status: LC

Records: 442
First Record: 1900
Latest Record: 2023

1992-on hectads: 96
Pre-1992 hectads: 63
Total hectads: 137

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About this species

Recorded altitude range
1m to 301m

Species text

The species is widespread in East Anglia and south-eastern England but is much more locally distributed elsewhere in southern Britain. It is apparently absent north of Derbyshire although the county distribution map in Locket et al. (1974) extends the range as far north as Cumbria. Apart from Sweden, where it is included in their Red List (Gärdenfors 2000) the spider is absent from Scandinavia, but otherwise widespread in north-western and central Europe.

Habitat and ecology
This species builds its webs on low vegetation in wetland habitats including saltmarsh, reed fen, sedge marsh and carr woodland. Both sexes are mature from early to mid-summer with females recorded into the autumn.

Generally uncommon but most frequent in south-eastern England. There has been no recent decline in this species.

Drainage and degradation of wetland habitats.

Management and conservation
Ensure wetlands are not drained for agriculture or other land-use.

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 206 records with adult season information)


background methodology

Broad Habitat Data (based on 163 records with habitat information)

Broad subhabitat Data (based on 22 records with subhabitat information)

Structural Habitat Data (based on 55 records with structural habitat information)

Habitat Detail and Method (based on 120 records with habitat detail and method information)

Recorded management for locations with Rugathodes instabilis

Recorded substrate and hydrology for locations with Rugathodes instabilis


Rugathodes instabilis adult male
Rugathodes instabilis adult male
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