Summary for Porrhomma montanum (Araneae)

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National Distribution

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Identification difficulty rating: 4
Name: Porrhomma montanum
Authority: Jackson, 1913
Order: Arachnida: Araneae
Family: Linyphiidae
National Rarity status: NS
IUCN status: LC

Records: 198
First Record: 1878
Latest Record: 2023

1992-on hectads: 47
Pre-1992 hectads: 54
Total hectads: 96

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Identification guidance for Porrhomma montanum

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About this species

Recorded altitude range
7m to 1097m

Species text

The species has a widespread but scattered distribution north of a line between mid-Wales and Yorkshire, but there is one isolated site known in south-east England. It is widespread in north-western Europe, but is not recorded from France, Austria, Switzerland or Poland. It is a Palaearctic species (Platnick 1998).

Habitat and ecology
This is typically an upland species occurring beneath rocks on open mountains. On two occasions specimens have been taken from wet leaf litter in a ditch at Thorndon Park, an ancient woodland in South Essex (P.R. Harvey, pers. comm.). In Snowdonia, mature females have been recorded in April and September. In Essex, adults of both sexes were recorded in March with further females in July. Females have been observed guarding single egg-sacs affixed beneath felsenmeer rocks in mid-September at Moel Siabod, Snowdonia.

The species has suffered some decline in recent years but its upland habitat may have been under-recorded. It is uncommon in Europe.

Given the apparently broad habitat range of this species, the reasons for its apparent decline are unclear.

Management and conservation
Ensure rocky areas in mountains are not subject to undue disturbance. More information is required on the exact range of habitats occupied by the species in Britain.

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 55 records with adult season information)


background methodology

Broad Habitat Data (based on 86 records with habitat information)

no subhabitat data available

Structural Habitat Data (based on 38 records with structural habitat information)

Habitat Detail and Method (based on 48 records with habitat detail and method information)

Recorded management for locations with Porrhomma montanum

Recorded substrate and hydrology for locations with Porrhomma montanum


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