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: rarely caught, probably often ignored

  No data
Global distribution (WSC 2021): Europe, Turkey
 male  female
Female with egg sac from May to August.
Distribution List
Austria   (no references) ||| Czechia   (no references) ||| France   (no references) ||| Germany   (no references) ||| Norway   (Aakra et al., 2016) ||| Poland   (no references) ||| Spain   (Breitling, 2020) ||| Sweden   (Kronestedt, 2001) ||| Turkey (Asia)   (no references) |||

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 pdf

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

Farlund M (2019) Norwegian Spiders - Norske edderkopper. Siste oppdatering for funn av nye arter 10. oktober, 2019. Online at pdf

Heimer S (1980) Eine bemerkenswerte Kugelspinne aus dem Harz (Arachnida, Araneae, Theridiidae). Faunistische Abhandlungen, Staatliches Museum für Tierkunde Dresden 7: 179-181 pdf

Knoflach B (1993a) Theridion conigerum Simon - rediscovered in Austria (Araneae: Theridiidae). Bulletin of the British Arachnological Society 9: 205-208 pdf

Kronestedt T (2001) Checklist of Spiders (Araneae) in Sweden [Preliminary version February 2001] pdf

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

Kupryjanowicz J (1997a) Spiders of the Biebrza National Parc - species new and rare to Poland. Proceedings of the 16th European Colloquium of Arachnology: 183-194 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

Løvbrekke H (unpubl.)

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

28-06-2020 Image insert
24-03-2020 Distribution insert Detail
14-01-2017 Image insert
26-02-2014 Distribution update Detail
05-07-2013 Distribution update Detail