Summary for Diplocephalus protuberans (Araneae)

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National Distribution

 
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Identification difficulty rating: 4
Name: Diplocephalus protuberans
Authority: (O.P.-Cambridge, 1875)
Order: Arachnida: Araneae
Family: Linyphiidae
National Rarity status: NR
IUCN status: VU, criteria: B2ab(ii)

Records: 51
First Record: 1900
Latest Record: 2001

1992-on hectads: 7
Pre-1992 hectads: 21
Total hectads: 28

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About this species

Recorded altitude range
50m to 300m

Species text

Distribution
Mainly restricted to northern England, especially the Pennines, with a few scattered records in Wales and southern Scotland; also recently discovered in East Sussex, North Hampshire and Somerset.

Habitat and ecology
The spider is found in wet places, among moss, grass or rushes, often near streams or on moorland. A single female was sieved from loose leaf litter in fairly deep shade on a gravel bed in the channel of the River Rother near Selborne, and a male was collected from leaf litter beside a wooded gill stream in Hastings Country Park. The streams in the Hanger woodlands of north-east Hampshire and the gill streams of Hastings and the Weald are known to have a number of other species more typical of the north and west of Britain. D. protuberans is possibly adult most of the year.

Status
Local and never numerous. Area of occupancy limited, recorded from seven hectads since 1992 and showing a decline of 50% in hectads with spider records both before and after that date. Trend analysis of the continuing decline in area of occupancy over the period 1976 to 2005 indicates a reduction in population size of 42% over a ten year period.

Threats
Drainage of wetlands for agriculture and forestry and engineering works on riverine channels are potential threats to this species.

Management and conservation
Ensure water table is maintained in wetlands.

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 4 records with adult season information)


Habitats

background methodology

Broad Habitat Data (based on 11 records with habitat information)

no subhabitat data available

Structural Habitat Data (based on 2 records with structural habitat information)

Habitat Detail and Method (based on 2 records with habitat detail and method information)

Recorded management for locations with Diplocephalus protuberans

Recorded substrate and hydrology for locations with Diplocephalus protuberans

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