Summary for Mermessus trilobatus (Araneae)

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National Distribution

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Identification difficulty rating: 5
Name: Mermessus trilobatus
Authority: (Emerton, 1882)
Order: Arachnida: Araneae
Family: Linyphiidae
IUCN status: NA

Records: 314
First Record: 2007
Latest Record: 2023

1992-on hectads: 104
Pre-1992 hectads: 0
Total hectads: 104

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About this species

Recorded altitude range
1m to 200m

Species text

Mermessus trilobatus is a North American species introduced in the 1970s to Germany and it has spread widely in Europe since then. The first British record was from Tilbury Power Station, Essex in 2007. In the decade since then it spread widely in the Thames corridor and as far north as the Brecklands of Norfolk and Suffolk. It is currently frequent in southern England south of a line between the Severn Estuary and the Wash. It has been reported from western Europe as far East as Germany.

Habitat and ecology
It occurs on or close to the ground layer in a wide variety of habitats including grassland, woodland, gardens, brownfield sites and sand dunes. Adults of both sexes have been found throughout the year with a peak of abundance in June and July.

This apparently invasive species has no assigned status but, given its widespread distribution and range of habitats, there do not appear to be any current threats.


Adult Season

Adult Season Data (based on 313 records with adult season information)


background methodology

Broad Habitat Data (based on 35 records with habitat information)

Broad subhabitat Data (based on 14 records with subhabitat information)

Structural Habitat Data (based on 122 records with structural habitat information)

Habitat Detail and Method (based on 240 records with habitat detail and method information)

Recorded management for locations with Mermessus trilobatus

Recorded substrate and hydrology for locations with Mermessus trilobatus


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