Summary for Porrhomma convexum (Araneae)

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National Distribution

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Porhomma convexum adult male Copyright: Esmond Brown
Identification difficulty rating: 4
Name: Porrhomma convexum
Authority: (Westring, 1851)
Order: Arachnida: Araneae
Family: Linyphiidae
National Rarity status: NS
IUCN status: LC
Watching Brief: Amber

Records: 298
First Record: 1912
Latest Record: 2022

1992-on hectads: 63
Pre-1992 hectads: 116
Total hectads: 173

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About this species

Recorded altitude range
0m to 900m

Species text

P. convexum is widespread but scattered in much of England and Wales, but widely scattered elsewhere. A Palaearctic species widespread in north-western and central Europe.

Habitat and ecology
Typically this spider is found within damp mines and caves where it constructs a small web within recesses in the rock. P. convexum can also be found in damp culverts, cellars, beneath rock piles, amongst thick undergrowth and within sewage filter beds (Crocker & Daws 1996; Locket & Millidge 1953; Bristowe 1958). Adults may be found throughout the year. Single egg-sacs are affixed to the rock surface and have been noted in November.

The species may have suffered long-term decline throughout its range, but may be frequent where it does occur. Some older records may have been misidentified.

Given the apparent broad range of subterranean habitats utilised by this species, it is difficult to understand the reason for its apparent recent decline.

Management and conservation
Further research is needed to determine the micro-habitat requirements and ecology of this species. Until this is undertaken, destruction or disturbance of the subterranean habitats where it occurs, natural and man-made, should be prevented.

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 57 records with adult season information)


background methodology

Broad Habitat Data (based on 112 records with habitat information)

Broad subhabitat Data (based on 7 records with subhabitat information)

Structural Habitat Data (based on 26 records with structural habitat information)

Habitat Detail and Method (based on 36 records with habitat detail and method information)

Recorded management for locations with Porrhomma convexum

Recorded substrate and hydrology for locations with Porrhomma convexum


Porhomma convexum adult male
Porhomma convexum adult male
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