Resources:
Theridiidae  Sundevall, 1833 / Robertus  O. Pickard-Cambridge, 1879   19 species

Robertus lyrifer  Holm, 1939

Description
Male

Palp: with angled tibia. Prosoma 1.2 mm long. Colouration as in female, but lighter.

Body length male: 2.5-2.7 mm
Female

Epigyne with a strongly sclerotized horseshoe-shaped structure. Palp: claw with 2 teeth. Prosoma brown, with some darker radiating striae. Prosoma 1.3-1.6 mm long. Sternum greyish brown, darker on edges. Eyes: AME one diameter apart, and 1.5 diameters from ALE, PME 1.5 diameters apart, and 2 diameters from PLE, AME one diameter from PME. Legs reddish brown. Opisthosoma greyish black.

Body length female: 3-3.9 mm
Additional information

In moss and in bush layer of open birch forests.

Distribution
  Presence
  No data
Global distribution (WSC 2020): Iceland, Scandinavia, Austria, Russia (Europe to Far East), Canada
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
Figures
Distribution List
Austria   (no references) ||| Estonia   (no references) ||| Finland   (Koponen et al., 2016) ||| Iceland   (Agnarsson, 1996) ||| Lithuania   (no references) ||| Norway   (no references) ||| Russia, Eastern   (no references) ||| Russia, Northern   (no references) ||| Russia, Western   (no references) ||| Sweden   (no references) |||
References

Agnarsson I (1996) Íslenskar köngulær Fjölrit Náttúrufræðistofnunar 31: 1-175 pdf

Hauge E (1969) Six species of spiders (Araneae) new to Norway. Norsk Ent Tidsskr 16: 1-8

Helsdingen P J van (2010a) Araneae. In: Fauna Europaea Database (Version 2010.1), online at www.european-arachnology.org

Holm Å (1945) Zur Kenntnis der Spinnenfauna des Torneträskgebietes. Arkiv för Zoologi 36(A15): 1-80 pdf

Koponen S, Fritzén N R, Pajunen T (2016) Checklist of spiders in Finland (Araneae). 6th version, December 2016, online at http://biolcoll.utu.fi/arach/checklist_of_spiders_in_Finland.htm pdf

Le Peru B (2011) The spiders of Europe, a synthesis of data: Volume 1 Atypidae to Theridiidae. Mémoires de la Société Linnéenne de Lyon 2: 1-522 pdf

Løvbrekke H (unpubl.)

World Spider Catalog (2020) World Spider Catalog. Version 21.0. Natural History Museum Bern, online at http://wsc.nmbe.ch (20.03.2020) doi: 10.24436/2 pdf

Wunderlich J (1976) Zur Kenntnis der mitteleuropäischen Arten der Gattung Enoplognatha Pavesi und Robertus O. Pick. Cambridge Senckenbergiana Biologica 57: 97-112

Updates
11-08-2015 Image insert
24-06-2014 Image insert