Summary for Theridion blackwalli


National Distribution

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Cryphoeca silvicola Orkney Copyright: Lee Johnson
Name: Sardinidion blackwalli
Authority: (O.P.-Cambridge, 1871)
Order: Arachnida: Araneae
Family: Theridiidae

Records: 326
First Record: 1896
Latest Record: 2019

1992-on hectads: 100
Pre-1992 hectads: 29
Total hectads: 123

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About this species

Recorded altitude range
1m to 188m

Species text

The species is widespread but locally distributed in England, mainly south of the Midlands. In Fenno-scandia it has only been recorded from Finland, but the spider is otherwise widespread in north-western and central Europe.

Habitat and ecology
This species builds its webs mainly in and around buildings, but also in grass tussocks and on other low plants and tree trunks in a variety of habitats. In Leicestershire the species occurs on walls and gravestones in and around churches and their churchyards, but has not been recorded from vegetation within the county (J. Daws, pers. comm.). Adults of both sexes have been recorded between May and July, but females may persist later. Daws (1999) suggests a short maturity season.

Generally uncommon, although it has been found to be frequent in and around churches in Leicestershire (Daws 1999).

Too little is known about the ecological requirements of this species to establish what threats it faces.

Management and conservation
More information on the ecology of this species is needed before management recommendations can be made.

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 173 records with adult season information)


background methodology

Broad Habitat Data (based on 124 records with habitat information)

Broad subhabitat Data (based on 1 records with subhabitat information)

Structural Habitat Data (based on 5 records with structural habitat information)

Habitat Detail and Method (based on 46 records with habitat detail and method information)

Recorded management for locations with Theridion blackwalli

Recorded substrate and hydrology for locations with Theridion blackwalli


Theridion blackwalli male
Theridion blackwalli male
Theridion  backwalli female
Theridion backwalli female
Theridion  backwalli female under eaves of thatched roof
Theridion backwalli female under eaves of thatched roof
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