Summary for Porrhomma microphthalmum (Araneae)

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National Distribution

 
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Identification difficulty rating: 4
Name: Porrhomma microphthalmum
Authority: (O.P.-Cambridge, 1871)
Order: Arachnida: Araneae
Family: Linyphiidae
IUCN status: LC

Records: 1331
First Record: 1860
Latest Record: 2018

1992-on hectads: 209
Pre-1992 hectads: 171
Total hectads: 312

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About this species

Recorded altitude range
0m to 550m

Species text

Distribution
The species is widespread in central and south-eastern England but more scattered elsewhere in England. Apart from scattered records in the south-west, it is absent from much of the west, extending as far north as central eastern Scotland. The species is widespread in north-western and central Europe, but only doubtfully reported for Ireland (Van Helsdingen 1996).

Habitat and ecology
A common spider of agricultural fields (Thornhill 1983) and sparsely vegetated grasslands, such as mudflats and saline grasslands (Meijer 1977). P. microphthalmum is partly subterranean, living between cracks in the soil. However, it may on occasion, be found higher up in vegetation, for example on shrubs. The spider is a frequent aeronaut, which may explain its apparent wide habitat niche as individuals may have been collected on higher vegetation during a ballooning attempt. A Swiss study found that there were two peaks in aeronautic dispersal: the first between July and mid-August and the second between the end of September and mid-December (Blandenier & F├╝rst 1998). In Britain, Thornhill (1983) found females between January and September and males between March and November. Our data show a peak of adult males in late spring and early summer and females from early to mid-summer, with adults of both sexes occasionally found throughout the year.

Status
The spider is common in the south-east, rare in the north and west.

Original author of profile: J.R. Bell

Text based on Harvey, P.R., Nellist, D.R. & Telfer, M.G. (eds) 2002. Provisional atlas of British spiders (Arachnida, Araneae), Volumes 1 & 2. Huntingdon: Biological Records Centre.  References

Adult Season

Adult Season Data (based on 500 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 469 records with habitat information)

Broad subhabitat Data (based on 30 records with subhabitat information)

Structural Habitat Data (based on 240 records with structural habitat information)

Habitat Detail and Method (based on 238 records with habitat detail and method information)

Recorded management for locations with Porrhomma microphthalmum

Recorded substrate and hydrology for locations with Porrhomma microphthalmum

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