Linyphiidae  Blackwall, 1859 / Leptorhoptrum  Kulczynski, 1894   1 species

Leptorhoptrum robustum  (Westring, 1851)


Cymbium shorter than palpal tibia. Embolus strongly sclerotised. Paracymbium very simple. Epigyne with broad epigynal plate, posterior margin ± straight. Receptacula seminis small and spheroidal, visible through epigyne. Prosoma brown, with dark margin and radial stripes. Sternum brown, tinged with black. Chelicerae brown, robust. Legs yellow-brown, ± short, robust. Opisthosoma grey to almost black.

Body length male: 3-4.2 mm
Body length female: 3-4.8 mm
Additional information

In moss and leaves of damp, cool localities from lowland up to alpine zone.

It has been described that this small species repeatedly bite sewage plant workers (Duffey & Green 1975). It is highly unlikely that a 3 mm linyphiid can bite humans, but other effects such as allergic reactions cannot be excluded. 

Character states from linyphiid key
  No data
Global distribution (WSC 2019): North America, Europe, Russia (Europe to Far East), Japan
 male  female
mainly in summer

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Duffey E, Green M B (1975) A linyphiid spider biting workers on a sewage-treatment plant. Bull Br Arachnol Soc 3: 130–131

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Løvbrekke H (unpubl.)

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Roberts M J (1987) The spiders of Great Britain and Ireland. Volume 2: Linyphiidae and checklist. Harley Books Colchester

Wiehle H (1956) Spinnentiere oder Arachnoidea, X. 28: Familie Linyphiidae-Baldachinspinnen. Tierwelt Deutschlands 44: 1-337

World Spider Catalog (2019) World Spider Catalog, version 20.0. Natural History Museum Bern, online at (20.01.2019) doi: 10.24436/2

25-02-2014 Image insert
26-01-2014 Image insert
26-11-2013 Datasheet update Old value