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 mmFemale
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: 3.0-3.9 mmAdditional information
In moss and in bush layer of open birch forests.
Distribution
Phenology
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
 |  |
Figures
Pedipalp
(Hauge 1969)
Pedipalp
(Holm 1945)
Pedipalp
(Agnarsson 1996)
Pedipalp, retrolateral view
(Wunderlich 1976)
Pedipalp, ventral view
(Løvbrekke unpubl.)
Pedipalp, retrolateral view
(Løvbrekke unpubl.)
Part of embolus
(Holm 1945)
Palpal claw
(Wunderlich 1976)
Epigyne
(Hauge 1969)
Epigyne
(Agnarsson 1996)
Epigyne, ventral view
(Wunderlich 1976)
Epigyne, ventral view
(Løvbrekke unpubl.)
Epigyne
(Morka unpubl.)
Vulva
(Hauge 1969)
Vulva, dorsal view
(Løvbrekke unpubl.)
Distribution List
References
Aakra K, Hauge E (2003) Checklist of Norwegian spiders (Arachnida: Araneae), including Svalbard and Jan Mayen. Norwegian Journal of Entomology 50: 109-129 
Agnarsson I (1996) Íslenskar köngulær Fjölrit Náttúrufræðistofnunar 31: 1-175
Biteniekytė M, Rėlys V (2012) The checklist of Lithuanian spiders (Arachnida: Araneae). Biologija 57: 148-158
Esyunin S L, Efimik V E (1996a) Catalogue of the spiders (Arachnida, Aranei) of the Urals. KMK Scientific Press, Moscow, 228 pp.
Hauge E (1969) Six species of spiders (Araneae) new to Norway. Norsk Entomologisk Tidsskrift 16: 1-8
Holm Å (1945) Zur Kenntnis der Spinnenfauna des Torneträskgebietes. Arkiv för Zoologi 36(A15): 1-80
Knoflach B, Thaler K (1998) Kugelspinnen und verwandte Familien von Österreich: ökofaunistische Übersicht (Araneae: Theridiidae, Anapidae, Mysmenidae, Nesticidae). Stapfia 667-712
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
Koponen S, Marusik Y M, Tanasevitch A V (1998) New data on the spider fauna of the Polar Urals (Aranei). Arthropoda Selecta 6: 109-119
Kronestedt T (2001) Checklist of Spiders (Araneae) in Sweden [Preliminary version February 2001]
Løvbrekke H (unpubl.)
Morka G H (unpubl.)
Vilbaste A (1987) Eesti Ämblikud (Aranei). Annoteeritud nimestik. Estonian spiders (Aranei). An annotated check list. Valgus, Tallinn. 113 pp. & 512 maps on 67 unpag. pages
WSC (2026) World Spider Catalog. Version 27. Natural History Museum Bern, online at http://wsc.nmbe.ch (13.2.2026) doi: 10.24436/2
Wunderlich J (1976) Zur Kenntnis der mitteleuropäischen Arten der Gattung Enoplognatha Pavesi und Robertus O. Pick. Cambridge Senckenbergiana Biologica 57: 97-112