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

Robertus mediterraneus Eskov, 1987

Description
Male

Prosoma 1.4-1.7 mm long. Colouration as in female.

Body length male: 2.8 mm
Female

Epigyne posteriorly with a strongly sclerotized rounded plate. Palp: claw with 3 teeth. Prosoma brownish yellow, 1.4-1.7 mm long. Chelicerae: anterior margin with 3 teeth, of which the middle one is largest, both proximal teeth contiguous. Opisthosoma yellow-brownish.

Body length female: 3.5 mm
Additional information

In the ground layer of forests of medium altitudes, Mediterranean species.

Distribution
  Presence
  No data
Global distribution (WSC 2026): Spain, France, Switzerland, Austria, Italy, Slovenia, Eastern Europe, Caucasus
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
Figures
Distribution List
Albania   (van Helsdingen & IJland, 2015) ||| Austria   (Milasowszky et al., 2015) ||| Azerbaijan   (Otto, 2022) ||| Bosnia and Herzegovina   (Komnenov, 2010) ||| Bulgaria   (Blagoev et al., 2018) ||| France   (Le Peru, 2007) ||| Georgia   (Otto, 2022) ||| Greece   (Bosmans & Chatzaki, 2005) ||| Italy   (Isaia et al., 2025) ||| Montenegro   (Naumova et al., 2019a) ||| North Macedonia   (Komnenov, 2014) ||| Romania   (Moscaliuc, 2013) ||| Russia, Southern   (Otto, 2022; Ponomarev, 2022) ||| Serbia   (Ćurčić et al., 2007) ||| Slovenia   (Kuralt et al., 2024) ||| Spain   (Branco et al., 2019) ||| Switzerland   (Hänggi et al., 2022) ||| Ukraine   (Mikhailov, 2013) |||
References

Barrientos J A, Uribarri I, García-Sarrión R (2014a) Arañas (Arachnida, Araneae) de un hayedo del Montseny (Cataluña, España). Revista Ibérica de Aracnología 24: 3-14 pdf

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

Bosmans R, Chatzaki M (2005) A catalogue of the spiders of Greece – a critical review of all spider species cited from Greece with their localities. Nieuwsbrief van de Belgische arachnologische Vereniging 20 (2, suppl.): 1-124 pdf

Branco V V, Morano E, Cardoso P (2019) An update to the Iberian spider checklist (Araneae). Zootaxa 4614: 201-254 pdf

Breitling R (2020) South European spiders from the Duffey collection in the Manchester Museum (Arachnida: Araneae). Arachnology 18: 333-362 pdf

Ćurčić B P M, Deltshev C C, Tomić V T, Ćurčić S B (2007) Biodiversity of spiders: on some taxa new to Serbia and to science. Archives of Biological Sciences Belgrade 59: 19P-20P pdf

Eskov K Y (1987a) The spider genus Robertus O. Pickard Cambridge in the USSR, with an analysis of its distribution. Senckenbergiana Biologica 67: 279-296 pdf

Hänggi A, Pétremand G, Brenneisen S (2022) Spiders (Araneae) from green roofs in north-west Switzerland – faunistic data with two species new to Switzerland. Arachnologische Mitteilungen 64: 73-82 pdf

Helsdingen P J van, IJland S (2015) A quick scan of the spider fauna in the surroundings of Përmet, Albania (Arachnida, Araneae) - preliminary report. Nieuwsbrief SPINED 35: 15-33 pdf

Isaia M, Tolve M, Pantini P (2025) Araneae.it: 2.0: the new updated version of the digital catalog of the Italian spiders and other arachnids (Arachnida: Araneae, Opiliones, Scorpiones, Pseudoscorpiones, Palpigradi, Solifugae). Fragmenta Entomologica 57: 197-204 pdf

Knoflach B (1992) Neue Robertus-Funde in den Alpen: R. mediterraneus Eskoiv und Robertus sp.. Berichte des Naturwissenschaftlich-Medizinischen Vereins in Innsbruck 79: 161-171 pdf

Komnenov M (2010) Checklist of spiders (Araneae) of Bosnia and Herzegovina. Uzizaž i Biospeld 5(2009): 52-69 pdf

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

Kuralt Ž, Pajek Arambašič N, Ferle M, Kostanjšek R (2024) A contribution to the Slovenian spider fauna – V. Natura Sloveniae 26: 29-42 pdf

Le Peru B (2007) Catalogue et répartition des araignées de France. Revue Arachnologique 16: 1-468 pdf

Mikhailov K G (2013) The spiders (Arachnida: Aranei) of Russia and adjacent countries: a non-annotated checklist. Arthropoda Selecta, Supplement 3: 1-262 pdf

Milasowszky N, Bauchhenss E, Freudenschuss M, Hepner M, Komposch C, Zulka K P (2015) Erstnachweise von Spinnen in Österreich (Araneae: Gnaphosidae, Linyphiidae, Lycosidae, Philodromidae, Theridiidae, Titanoecidae, Salticidae). Biodiversität und Naturschutz in Ostösterreich ‐ BCBEA 1/2: 296-303 pdf

Moscaliuc L A (2013) Contributions to the knowledge of Romanian spider fauna. Steps towards an updated checklist. Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 56: 135-142 pdf

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

Otto S (2022) Caucasian spiders. A faunistic database on the spiders of the Caucasus Ecoregion. Database version 02.2022. Internet: caucasus-spiders.info.

Ponomarev A V (2022) Spiders (Arachnida: Araneae) of the southeast of the Russian Plain: catalogue, the fauna specific features. SSC RAS Publishers, Rostov-on-Don, 640 pp. 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

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