Summary for Saaristoa firma (Araneae)

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National Distribution

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Saaristoa firma female Copyright: Tylan Berry
Identification difficulty rating: 3
Name: Saaristoa firma
Authority: (O.P.-Cambridge, 1905)
Order: Arachnida: Araneae
Family: Linyphiidae
BAP status: UKBAP
National Rarity status: NS
IUCN status: LC

Records: 388
First Record: 1900
Latest Record: 2023

1992-on hectads: 109
Pre-1992 hectads: 93
Total hectads: 195

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About this species

Recorded altitude range
3m to 400m

Species text

The species is widespread but very scattered throughout Britain, and is apparently absent from many areas. It is widespread in much of north-western and central Europe.

Habitat and ecology
The spider has generally been recorded from damp situations amongst moss, sphagnum, leaf litter, pine needles and heather in woodland, scrub, peat bog, fen and heathland. Adult females have been found throughout the year, adult males from August to September (Locket & Millidge 1951), April and June.

UK Biodiversity Action Plan priority species. Local and scarce. The species has shown a significant long-term decline of 51% in occupied 10-km squares, particularly in the eastern part of its range.

Given the relatively broad habitat requirements of this species, the apparent recent decline is difficult to explain. However, drainage of wetlands may have contributed.

Management and conservation
Further research is needed to determine the conservation requirements of this species.

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 185 records with adult season information)


background methodology

Broad Habitat Data (based on 157 records with habitat information)

Broad subhabitat Data (based on 9 records with subhabitat information)

Structural Habitat Data (based on 129 records with structural habitat information)

Habitat Detail and Method (based on 158 records with habitat detail and method information)

Recorded management for locations with Saaristoa firma

Recorded substrate and hydrology for locations with Saaristoa firma


Saaristoa firma male
Saaristoa firma male
Saaristoa firma female
Saaristoa firma female
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