Theridiidae  Sundevall, 1833 / Theridion  Walckenaer, 1805   54 species

Theridion petraeum  L. Koch, 1872

Description

Conductor with bipartite tip. Epigyne with straight or slightly convex posterior margin of epigynal groove. Vulva with entrance ducts forming a double loop. Prosoma yellow-orange, margin and dorsal groove black. Sternum yellowish, brownish darkened. Chelicerae yellowish. Legs yellow-orange, annulated and dark spotted. Opisthosoma dorsally with bright median band and irregularly spotted with brown-black, ventrally grey with white spots, large black spot anterior of spinnerets.

Body length male: 3.5-4.5 mm
Body length female: 3.5-4.5 mm
Additional information

In sandy areas, under grass and stones, frequent in alpine zone. Altitude up to 2200 m.

Distribution
  Presence
  No data
Distribution comment: Occurrence in the Caucasus needs to be verified (Otto 2017)
Global distribution (WSC 2021): North America, Europe, North Africa, Caucasus, Russia (Europe to Far East), Kazakhstan
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
Figures
Distribution List
Andorra   (Branco et al., 2019) ||| Austria   (no references) ||| Azerbaijan   (Otto, 2020) ||| Bulgaria   (Blagoev et al., 2018) ||| France   (no references) ||| France / Corsica   (no references) ||| Greece   (no references) ||| Italy   (Pantini & Isaia, 2019) ||| Liechtenstein   (no references) ||| Morocco   (Bosmans, unpubl.) ||| North Macedonia   (no references) ||| Portugal   (Branco et al., 2019) ||| Romania   (no references) ||| Russia, Central   (no references) ||| Russia, Eastern   (no references) ||| Russia, Western   (no references) ||| Slovenia   (Kostanjšek & Kuntner, 2015) ||| Spain   (Branco et al., 2019) ||| Switzerland   (no references) ||| Ukraine   (no references) |||
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

Bosmans R, Vanuytven H, Van Keer J (1994) On two poorly known Theridion species, recently collected in Belgium for the first time (Araneae: Theridiidae). Bulletin of the British Arachnological Society 9: 236-240 pdf

Bosmans R. (unpubl.) Provisional list of spiders of North Africa. Database excerpt Aug. 2019

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

Knoflach B (1998) Mating in Theridion varians Hahn and related species (Araneae: Theridiidae). Journal of Natural History 32: 545-604 pdf

Komnenov M (2017) New data on spider fauna (Araneae) of Shar Mountain, north-western Macedonia. Proceedings of the 5th Congress of the Ecologists of Macedonia, with international participation (Ohrid, 19th-22nd October 2016). Special issues of the Macedonian Ecological Society 13: 44-61 pdf

Kostanjšek R, Kuntner M (2015) Araneae Sloveniae: a national spider species checklist. ZooKeys 474: 1-91 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

Otto S (2020) Caucasian spiders. A faunistic database on the spiders of the Caucasus Ecoregion. Database version 03.2020. Internet: caucasus-spiders.info.

Pantini P, Isaia M (2019) Araneae.it: the online catalog of Italian spiders, with addenda on other arachnid orders occurring in Italy (Arachnida: Araneae, Opiliones, Palpigradi, Pseudoscorpionida, Scorpiones, Solifugae). Fragmenta Entomologica 51: 127-152 pdf

Wiehle H (1937) Spinnentiere oder Arachnoidea, VIII. 26: Familie Theridiidae oder Haubennetzspinnen (Kugelspinnen). Die Tierwelt Deutschlands 33: 119-222 pdf

WSC (2021) World Spider Catalog. Version 22.0. Natural History Museum Bern, online at http://wsc.nmbe.ch (29.05.2021) doi: 10.24436/2 pdf

Updates
06-01-2019 Distribution update Detail