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

Robertus frivaldszkyi (Chyzer, 1894)

WSC LSID urn:lsid:nmbe.ch:spidersp:007967

Key to genera | Key to species

Description
Male

Prosoma 1.7 mm long. Colouration as in female.

Female

Vulva: copulatory ducts coiled as in R. arundineti, but broader and shorter. Palp: claw with 4 teeth. Prosoma dark brownish, darker on edges. Prosoma 2.1 mm long. Sternum brownish, darker on edges. Eyes: AME more than one diameter apart and from ALE, posterior eyes all one diameter apart. Opisthosoma dark greyish, with numerous lighter spots.

Distribution
  Presence
  No data
Global distribution (WSC 2026): Central and south-eastern Europe
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
Figures
species

male Pedipalp, retrolateral view
(Knoflach & Thaler 2000)

species

male Pedipalp, ventral view
(Knoflach & Thaler 2000)

species

male Pedipalp, prolateral view
(Knoflach & Thaler 2000)

species

male Pedipalp, retrolateral view
(Wunderlich 1976)

species

female Epigyne/vulva, ventral view
(Knoflach & Thaler 2000)

species

female Epigyne, ventral view
(Wunderlich 1976)

species

female Vulva, dorsal view
(Wunderlich 1976)

Distribution List
Albania   (Deltshev et al., 2011b) ||| Bulgaria   (Blagoev et al., 2018) ||| Greece   (van Helsdingen et al., 2018) ||| Moldova   (Vasiliev & Mikhailov, 2023) ||| Montenegro   (Naumova et al., 2019a) ||| North Macedonia   (Komnenov, 2014) ||| Romania   (Weiss & Petrișor, 1999) ||| Serbia   (Deltshev et al., 2003b) ||| Slovakia   (Gajdoš et al., 1999) |||
References

Blagoev G, Deltshev C, Lazarov S, Naumova M (2018) The spiders (Araneae) of Bulgaria. Version: August 2018. National Museum of Natural History, Bulgarian Academy of Sciences. Online at http://www.nmnhs.com/spiders-bulgaria/ (accessed on 10.9.2018) pdf

Deltshev C D, Ćurčić B P M, Blagoev GA (2003b) The spiders of Serbia. Inst. Zoology, Fac. Biology, Belgrade & Inst. Zoology, Bulg. Acad. Sci., Sofia. 832 pp.

Deltshev C, Vrenozi B, Blagoev G, Lazarov S (2011b) Spiders of Albania – faunistic and zoogeographical review (Arachnida: Araneae). Acta Zoologica Bulgarica 63: 125-144 pdf

Gajdoš P, Svatoň J, Sloboda J (1999) Katalóg pavúkov Slovenska. Catalogue of Slovakian spiders. Ústav kr. ekol. SAV, Bratislava, 337 pp.

Helsdingen P J van, IJland S, Komnenov M (2018) Inventory of the spiders (Araneae) of the border region of northern Greece with Albania and FYR Macedonia. Nieuwsbrief SPINED 37: 5-23 pdf

Knoflach B, Thaler K (2000) Notes on Mediterranean Theridiidae (Araneae)-I. Memorie della Società Entomologica Italiana 78: 411-442 pdf

Komnenov M (2014) Spider fauna of the Osogovo Mt. Range, Northeastern Macedonia. Fauna Balkana 2: 1-267 pdf

Naumova M, Lazarov S, Deltshev C (2019a) Faunistic diversity of the spiders in Montenegro (Arachnida: Araneae). Ecologica Montenegrina 22: 50-89 pdf

Vasiliev A I, Mikhailov K G (2023) Annotated checklist of spiders (Araneae) of the Republic of Moldova. Invertebrate Zoology 20: 307-342 pdf

Weiss I, Petrișor A (1999) List of the spiders (Arachnida: Araneae) from Romania. Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 41: 79-107 pdf

WSC (2026) World Spider Catalog. Version 27. Natural History Museum Bern, online at http://wsc.nmbe.ch (13.2.2026) 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 pdf

Updates
30-10-2025 Distribution update Detail
12-07-2021 Distribution update Detail
17-03-2018 Distribution update Detail
18-12-2014 Image insert
04-12-2013 Distribution update Detail