Theridiidae  Sundevall, 1833 / Robertus  O. Pickard-Cambridge, 1879   18 species

Robertus arundineti (O. Pickard-Cambridge, 1871)

Description
Male

Male palp robust, spheroidal, with characteristic apophyses. Sternum red-brown. Chelicerae red-brown. Legs light yellow. Opisthosoma yellowish, suffused with black.

Body length male: 2.0-2.3 mm
Female

Epigyne with anteriorly pointed groove, entrance ducts long and convoluted. Epigastric furrow posteriorly bulged. Prosoma red-brown, shiny, margin strongly wrinkled. 

Body length female: 2.2-2.5 mm
Additional information

Near the ground in damp forest edges and in bogs, also on wet arable land.

Distribution
  Presence
  No data
Global distribution (WSC 2026): Europe, Turkey, Caucasus, Russia (Europe to South Siberia), Kazakhstan, Iran, Central Asia, China
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
Figures
Distribution List
Albania   (Komnenov, 2018; Blick, 2018) ||| Algeria   (Benhacene et al., 2023) ||| Armenia   (Otto, 2022) ||| Austria   (Knoflach & Thaler, 1998) ||| Azerbaijan   (Otto, 2022) ||| Belarus   (Ivanov, 2013) ||| Belgium   (Bosmans & Van Keer, 2017) ||| Bulgaria   (Blagoev et al., 2018) ||| Croatia   (Grbac et al., 2019) ||| Czechia   (Růžička & Řezáč, 2022a) ||| Denmark   (Scharff & Gudik-Sørensen, 2006) ||| Estonia   (Vilbaste, 1987) ||| Faroe Islands   (Lissner et al., 2016b) ||| Finland   (Koponen et al., 2016) ||| France   (Le Peru, 2007) ||| France / Corsica   (Le Peru, 2007) ||| Georgia   (Otto, 2022) ||| Germany   (Blick et al., 2016) ||| Greece   (Bosmans & Chatzaki, 2005) ||| Hungary   (Samu & Szinetár, 1999) ||| Iceland   (Agnarsson, 1996) ||| Ireland   (Lavery, 2019) ||| Italy   (Isaia et al., 2025) ||| Italy / Sardinia   (Isaia et al., 2025) ||| Italy / Sicily   (Isaia et al., 2025) ||| Kosovo   (Geci & Naumova, 2021b) ||| Latvia   (Cera, 2018) ||| Lithuania   (Biteniekytė & Rėlys, 2012) ||| Luxembourg   (Kreuels et al., 2019) ||| Moldova   (Vasiliev & Mikhailov, 2023) ||| Netherlands   (van Helsdingen, 2025a) ||| North Macedonia   (Komnenov, 2014) ||| Northern Ireland   (Lavery, 2019) ||| Norway   (Aakra & Hauge, 2003) ||| Poland   (Rozwałka & Stanska, 2008) ||| Portugal   (Branco et al., 2019) ||| Romania   (Weiss & Petrișor, 1999) ||| Russia, Central   (Ponomarev, 2022) ||| Russia, Eastern   (Esyunin & Efimik, 1996a) ||| Russia, Northern   (Esyunin & Efimik, 1996a) ||| Russia, Southern   (Otto, 2022; Ponomarev, 2022) ||| Russia, Western   (no references) ||| Serbia   (Dudić et al., 2013) ||| Slovakia   (Gajdoš et al., 1999) ||| Spain   (Branco et al., 2019) ||| Sweden   (Kronestedt, 2001) ||| Switzerland   (Maurer & Hänggi, 1990) ||| Turkey (Asia)   (Danışman et al., 2025a) ||| Ukraine   (Polchaninova & Prokopenko, 2019) ||| United Kingdom   (Lavery, 2019) |||
References

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