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National Distribution

About this species

Recorded altitude range

Species text

Distribution
In Britain, the species has only been recorded from two areas in South Northumberland: from the north bank of the River South Tyne near Hexham (1902 and subsequently), and from the confluence of the Rivers West and East Allen (1965). Further survey work is needed to establish the limits of its range. It is also known from France, Germany, Switzerland, the Balkans and Poland.

Habitat and ecology
Riverine shingle banks. D. connatus was originally found among waterborne debris on the river bank, but all subsequent records have been from under stones and boulders on sandy shingle banks at the side of rivers. Adults of both sexes have been found in June, September and October.

Status
Area of occupancy limited to four hectads. The spider was numerous at both its British sites, but the last known record was in 1965, an apparent decline of 100%.

Threats
No immediate threats are known, but the habitat is vulnerable to river engineering work. Survey work to establish its continued presence is urgently required.

Management and conservation
Ensure engineering works on rivers in N.E. England do not destroy the riverine shingle banks on which it is found.

Text based on Dawson, I.K., Harvey, P.R., Merrett, P. & Russell-Smith, A.R. (in prep.).  References

Adult Season

Habitats

background methodology

Recorded management for locations with Diplocephalus connatus

Recorded substrate and hydrology for locations with Diplocephalus connatus

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