Linyphiidae  Blackwall, 1859 / Ostearius  Hull, 1911   1 species

Ostearius melanopygius  (O. Pickard-Cambridge, 1879)

Description

Tibial apophysis large, bipartite. Embolus massive. Epigyne with 2 sclerotised clasps. Prosoma brown, with black margin and radial stripes. Sternum yellow-brown, tinged with black, with dark margin. Chelicerae yellow-brown, suffused with black, robust. Male: with tooth-like tubercle. Legs yellow-brown, relatively long. Opisthosoma strikingly orange, red or yellow (unicoloured dark specimens rarely). Broad, black ring around spinnerets.

Body length male: 2.3-2.5 mm
Body length female: 1.9-2.4 mm
Additional information

Frequently in scree, compost and market gardens, not in the mountains. On compost heaps, aggregative spider webs reached 10 m in lengths and comprised several thousand spiders. Probably expanding from west to east in Europe. This species is not native to Europe (alien species) but it is of South American origin. It had been introduced to Europe at least once and did establish.

Character states from linyphiid key
Distribution
  Presence
  No data
Global distribution (WSC 2019): South America. Introduced to Europe, Canary Is. to Egypt and Turkey, South Africa, China, Malaysia, Indonesia, New Zealand
Phenology
JanFebMarAprMayJunJulAugSepOctNovDec
 male  female
mainly early year and autumn
Figures
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)

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

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Løvbrekke H (unpubl.)

Millidge A F (1985) Some Linyphiid spiders from South America (Araneae, Linyphiidae). American Museum Novitates 2836: 1-78

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Pfliegler W A, Schönhofer A, Niedbała W, Vella P, Sciberras A, Vella A (2017) New records of mites (Acari) and harvestmen (Opiliones) from Malta with a preliminary checklist of Maltese Arachnida. Soil Organisms 89: 85-110 pdf

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Rozwałka R, Stachowicz J (2010) First record of Ostearius melanopygius (Cambridge, 1879) (Araneae: Linyphiidae) in the eastern part of Poland. Przegl Zool 52-43: 159-161

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World Spider Catalog (2019) World Spider Catalog, version 20.5. Natural History Museum Bern, online at http://wsc.nmbe.ch (20.09.2019) doi: 10.24436/2

Updates
29-04-2019 Image insert
05-02-2019 Distribution update Old value
22-10-2018 Datasheet update Old value
16-05-2018 Distribution update Old value
15-12-2017 Image insert
07-12-2017 Datasheet update Old value
03-02-2017 Image insert
23-09-2015 Distribution update Old value
29-07-2014 Distribution update Old value
15-10-2013 Distribution update Old value