Summary for Enoplognatha mordax (Araneae)

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National Distribution

 
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Enoplognatha mordax  female and egg-sac Copyright: Chris Bentley
Identification difficulty rating: 4
Name: Enoplognatha mordax
Authority: (Thorell, 1875)
Order: Arachnida: Araneae
Family: Theridiidae
National Rarity status: NS
IUCN status: LC

Records: 195
First Record: 1900
Latest Record: 2017

1992-on hectads: 24
Pre-1992 hectads: 25
Total hectads: 37

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About this species

Recorded altitude range
0m to 10m

Species text

Distribution
E. mordax is confined to coastal sites in the south and east of England and South Wales, with a single old record from Dumfries-shire. The main centre of distribution is between Suffolk and north Kent. The species is widespread but uncommon in western and central Europe as far north as Sweden, where it is included on their Red List (Gärdenfors 2000).

Habitat and ecology
E. mordax has been recorded from saltmarshes where it is found amongst litter on the strand line and on vegetation at the upper end of the marsh. Adults are found in early summer with a peak of both sexes in June, females occasionally persisting until September.

Status
Recorded from 18 hectads post 1992, with little apparent change.

Threats
Drainage and reclamation of saltmarshes may pose a threat. Sea levels around Essex are rising relative to the land by some 6mm a year, a combination of the land sinking and sea level rising as a result of global warming. This is causing erosion of saltmarshes and at the present rate most of the habitat will have been lost within a few decades. Many of the Thames Marshes have been reclaimed for industrial development, with the extensive use of vertical concrete-capped iron pilings along the waterfront leaving very little saltmarsh. With the abandonment of older industrial sites next to the Thames, there is now enormous pressure from initiatives such as the 'Thames Gateway' to redevelop, often for high value riverside housing. It seems unlikely that the importance of small areas of fragile saltmarsh will be adequately taken into account.

Management and conservation
Managed realignment, where traditional hard sea defences are replaced by softer, more responsive and natural defensive beaches, or where the sea is allowed to reform saltmarshes inland of the existing defensive wall, may provide new habitat suitable for this species.

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 99 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 46 records with habitat information)

no subhabitat data available

Structural Habitat Data (based on 52 records with structural habitat information)

Habitat Detail and Method (based on 50 records with habitat detail and method information)

Recorded management for locations with Enoplognatha mordax

Recorded substrate and hydrology for locations with Enoplognatha mordax

Images

Enoplognatha mordax  female and egg-sac
Enoplognatha mordax female and egg-sac
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