Summary for Evansia merens (Araneae)

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National Distribution

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Evansia merens female Copyright: Tylan Berry
Identification difficulty rating: 3
Name: Evansia merens
Authority: O.P.-Cambridge, 1900
Order: Arachnida: Araneae
Family: Linyphiidae
National Rarity status: NS
IUCN status: LC

Records: 198
First Record: 1900
Latest Record: 2022

1992-on hectads: 41
Pre-1992 hectads: 60
Total hectads: 98

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About this species

Recorded altitude range
1m to 457m

Species text

An inhabitant of north and west Britain, it is rarely found south and east of the line connecting the Humber and the Exe, though a record from Berkshire in 2003 extended its known range by some 100 km. This species has a wide Palaearctic distribution and is fairly widespread in north-western and central Europe, but has not been recorded from Belgium or the Netherlands.

Habitat and ecology
Open heaths and moorland. This myrmecophilous spider has been recorded from the nests of several ant species (Lasius niger, L. fuliginosus, Formica fusca, F. sanguinea). It occurs exclusively in dry peaty soils. In these habitats it is usually found within ant galleries beneath large rocks or logs. Both sexes are mature throughout the year, with egg-sacs (affixed to rocks within the ant galleries) produced between May and August. Our data show a peak of recorded females in May.

Populations appear to be increasingly fragmented. Recorded from 24 hectads since 1992, but showing a decline of 58% in Area of Occupancy (from 45 to 19 hectads) from before that date, though the species' specialised habitat may have resulted in some under-recording.

Destruction of heathland associated with urban and agricultural development pose threats.

Management and conservation
Protect heathland from urban and agricultural development.

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 58 records with adult season information)


background methodology

Broad Habitat Data (based on 63 records with habitat information)

Broad subhabitat Data (based on 3 records with subhabitat information)

Structural Habitat Data (based on 42 records with structural habitat information)

Habitat Detail and Method (based on 41 records with habitat detail and method information)

Recorded management for locations with Evansia merens

Recorded substrate and hydrology for locations with Evansia merens


Evansia merens female
Evansia merens female
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