Linyphiidae  Blackwall, 1859 / Mermessus  O. P.-Cambridge, 1899   2 species

Mermessus trilobatus  (Emerton, 1882)


Tibial apophysis rounded. Epigyne with caudally protruding lateral plates. Prosoma yellow-brown to orange-brown. Sternum orange. Legs brown to orange-brown. Opisthosoma grey to black.

Body length male: 1.6-2.1 mm
Body length female: 1.6-2.1 mm
Additional information

In meadows, in litter layer of forests, in humid areas and sandy beaches. Widely distributed in North America, presumably imported to south-western Germany in the 1970ies by the US Army and dispersed from there.

This species of North American origin is not native to Europe (alien species). It had been introduced to Europe at least once and did establish.

Frequency: Frequent

Character states from linyphiid key
  No data
Global distribution (WSC 2019): North America. Introduced to Azores, Europe
 male  female

Helsdingen P J van (1982a) Eperigone trilobata revealed as a trans-American species. Bull Br Arachnol Soc 5: 393-396

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

Hirna A (2017) First record of the alien spider species Mermessus trilobatus (Araneae: Linyphiidae) in Ukraine. Arachnologische Mitteilungen 54: 41-43 pdf

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

Løvbrekke H (unpubl.)

Mezőfi L, Markó V (2018) Some rare and remarkable spider species from Hungary (Arachnida: Araneae). Arachnologische Mitteilungen 55: 1-9 pdf

Millidge A F (1987) The Erigonine spiders of North America. Part 8. The Genus Eperigone Crosby and Bishop (Araneae, Linyphiidae). American Museum Novitates 2885: 1-75

Pantini P, Isaia M (2018) Checklist of the Italian spiders (version June 2018). online at pdf

Rozwalka R (2010) Mermessus trilobatus (Emerton, 1882) (Araneae: Linyphiidae) – a new spider species to the Polish fauna. Przeglad Zoologiczny 52-54: 163-166

Šestáková A, Suvák M, Krajčovičová K, Kaňuchová A, Christophoryová J (2017) Arachnids from the greenhouses of the Botanical Garden of the PJ Šafárik University in Košice, Slovakia (Arachnida: Araneae, Opiliones, Palpigradi, Pseudoscorpiones). Arachnologische Mitteilungen 53: 19-28 pdf

World Spider Catalog (2019) World Spider Catalog, version 20.0. Natural History Museum Bern, online at (20.01.2019) doi: 10.24436/2

04-04-2019 Datasheet update Old value
07-12-2018 Datasheet update Old value
22-05-2018 Image insert
16-08-2017 Distribution update Old value
03-02-2017 Image insert
09-05-2016 Image insert
13-05-2014 Distribution update Old value