Theridiidae  Sundevall, 1833 / Achaeridion  Wunderlich, 2008   1 species

Achaeridion conigerum  (Simon, 1914)


Palp: embolus short, straight. Prosoma 0.59-0.7 mm long. Characters mainly as in female. Opisthosoma: epigastric area bulging.

Body length male: 1.2-1.5 mm

Epigyne not sclerotized, indistinct. Prosoma brown, margined dark. Prosoma 0.55-0.74 mm long. Sternum black, or brown with black edges. Clypeus concave. Chelicerae: promargin with one tooth. Legs light brownish, with dark annulations, metatarsus I twice as long as tarsus I, metatarsus III with a trichobothrium. Opisthosoma dark, irregularly marbled with light yellow, ventrally black with 3 white spots, posteriorly with tubercle.

Body length female: 1.4-1.6 mm
Additional information

Under stones in heathland and forest, in cone-shaped retreat consisting of sand particles and prey remnants, attached freely under stones, single threads extend from the margin.

Frequency: Widely distributed, rarely caught, probably often ignored

  No data
Global distribution (WSC 2019): Europe, Turkey
 male  female
Female with egg sac from May to August.

Aakra K, Morka G H, Antonson A, Farlund M, Wrånes R E, Frølandshagen R, Løvbrekke H, Furuseth P, Fjellberg A, Lemke M, Pfliegler W P, Andersen S, Olsen K M, Aadland B, Berggren K (2016) Spiders new to Norway (Arachnida, Araneae) with ecological, taxonomical and faunistic comments. Norwegian Journal of Entomology 63: 6-43

Farlund M (2012) Norwegian Spiders - Norske edderkopper. Online at

Heimer S (1980) Eine bemerkenswerte Kugelspinne aus dem Harz (Arachnida, Araneae, Theridiidae). Faun Abh Staatl Mus Tierkunde Dresden 7: 179-181

Helsdingen P J van (2010a) Araneae. In: Fauna Europaea Database (Version 2010.1), online at

Knoflach B (1993a) Theridion conigerum Simon - rediscovered in Austria (Araneae: Theridiidae). Bull Br Arachnol Soc 9 (6): 205-208

Kunt K B, Kaya R S, Özkütük R S, Danişman T, Yagmur E A, Elverici M (2012) Additional notes on the spider fauna of Turkey (Araneae). Turkish Journal of Zoology 36: 637-651

Kupryjanowicz J (1997a) Spiders of the Biebrza National Parc - species new and rare to Poland. Proc 16th Europ Coll Arachnol, Siedlce, pp. 183-194

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

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

14-01-2017 Image insert
26-02-2014 Distribution update Old value
05-07-2013 Distribution update Old value