Micrargus apertus (O. Pickard-Cambridge, 1871)
Description
Male palp with pointed tooth on base of embolus, large surrounding membranous border. Prosoma dark brown. Opisthosoma grey to dark grey.
Body length male: 1.6-1.9 mmBody length female: 1.7-2.2 mm
Additional information
biology unknown, because often confused with M. herbigradus
Character states from linyphiid key
Distribution
Phenology
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
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Figures
Pedipalp
(Roberts 1987)
Pedipalp, retrolateral view
(Wiśniewski et al. 2018)
Pedipalp, ventral view
(Wiśniewski et al. 2018)
Pedipalp, retrolateral-ventral view
(Wiśniewski et al. 2018)
Pedipalp, ventro-retrolateral view
(Kielhorn & Gebert 2022)
Bulbus
(Millidge 1976)
Embolus
(Millidge 1976)
Embolic tooth
(Rėlys & Weiss 1997)
Embolic division
(Løvbrekke unpubl.)
Prosoma, lateral view
(Roberts 1987)
Epigyne
(Millidge 1976)
Epigyne
(Roberts 1987)
Epigyne
(Roberts 1987)
Epigyne, ventral view
(Løvbrekke unpubl.)
Epigyne, lateral view
(Løvbrekke unpubl.)
Epigyne
(Wiśniewski et al. 2018)
Epigyne
(Morka unpubl.)
Vulva
(Millidge 1976)
Vulva
(Roberts 1987)
Vulva
(Roberts 1987)
Vulva, dorsal view
(Løvbrekke unpubl.)
Vulva, dorsal view
(Wiśniewski et al. 2018)
Vulva, ventral view
(Wiśniewski et al. 2018)
Vulva, dorsal view
(Morka unpubl.)
Distribution List
"No references" does not mean that the species does not occur in this country, but that we have not yet inserted the reference for it. We are working on it.
References
Aakra K, Hauge E (2003) Checklist of Norwegian spiders (Arachnida: Araneae), including Svalbard and Jan Mayen. Norwegian Journal of Entomology 50: 109-129 
Biteniekytė M, Rėlys V (2012) The checklist of Lithuanian spiders (Arachnida: Araneae). Biologija 57: 148-158
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)
Blick T, Finch O-D, Harms K H, Kiechle J, Kielhorn K-H , Kreuels M, Malten A, Martin D, Muster C, Nährig D, Platen R, Rödel I, Scheidler M, Staudt A, Stumpf H, Tolke D (2016) Rote Liste und Gesamtartenliste der Spinnen (Arachnida: Araneae) Deutschlands. 3. Fassung, Stand April 2008, einzelne Änderungen und Nachträge bis August 2015. Naturschutz und Biologische Vielfalt 70/4: 383-510
Bosmans R, Van Keer K (2017) Een herziene soortenlijst van de Belgische spinnen (Araneae). Nieuwsbrief van de Belgische Arachnologische Vereniging 32: 39-69
Branco V V, Morano E, Cardoso P (2019) An update to the Iberian spider checklist (Araneae). Zootaxa 4614: 201-254
Cera I (2018) The checklist of Latvian spiders (Arachnida: Araneae). Environmental and Experimental Biology 16: 139-152
Deltshev C D, Ćurčić B P M, Blagoev GA (2003b) The spiders of Serbia. Inst. Zoology, Fac. Biology, Belgrade & Inst. Zoology, Bulg. Acad. Sci., Sofia. 832 pp.
Gajdoš P, Svatoň J, Sloboda J (1999) Katalóg pavúkov Slovenska. Catalogue of Slovakian spiders. Ústav kr. ekol. SAV, Bratislava, 337 pp.
Gnelitsa V A (2005) [Preliminary data on spiders of the family Linyphiidae of the National Natural Park "Synevyr" (Carpathians, Ukraine)]. Nature Reserves in Ukraine 11: 54-59
Hänggi A, Käser J (2011) Spinnen in Wäldern rund um Nunningen, Kanton Solothurn (NW-Schweiz) – Exposition und Temperatur als wichtige Faktoren für die Artenzusammensetzung. Mitteilungen der Naturforschenden Gesellschaften beider Basel 13: 67-88
Isaia M, Tolve M, Pantini P (2025) Araneae.it: 2.0: the new updated version of the digital catalog of the Italian spiders and other arachnids (Arachnida: Araneae, Opiliones, Scorpiones, Pseudoscorpiones, Palpigradi, Solifugae). Fragmenta Entomologica 57: 197-204
Kielhorn K-H, Gebert J (2022) Erstnachweis von Micrargus apertus (O. Pickard-Cambridge, 1871) und Wiederfund von Coelotes atropos (Walckenaer, 1830) in Sachsen (Arachnida: Araneae). Entomologische Nachrichten und Berichte 66: 19-22
Komnenov M (2020b) First data on the spider fauna (Araneae) of Maleshevski Mountains in the Republic of Macedonia. Bulletin of the Biology Students' Research Society 5: 33-43
Koponen S, Fritzén N R, Pajunen T (2016) Checklist of spiders in Finland (Araneae). 6th version, December 2016, online at http://biolcoll.utu.fi/arach/checklist_of_spiders_in_Finland.htm
Kreuels M, Staudt A, Christian S (2019) Die Spinnenfauna von Luxemburg – eine Zusammenstellung der Nachweise aus den Jahren 1906-2018 (Arachnida: Araneae). Bulletin de la Société des naturalistes luxembourgeois 121: 203-230
Kronestedt T (2001) Checklist of Spiders (Araneae) in Sweden [Preliminary version February 2001]
Lavery A (2019) A revised checklist of the spiders of Great Britain and Ireland. Arachnology 18: 196-212
Le Peru B (2007) Catalogue et répartition des araignées de France. Revue Arachnologique 16: 1-468
Løvbrekke H (unpubl.)
Millidge A F (1976) Re-examination of the erigonine spiders "Micrargus herbigradus" and "Pocadicnemus pumila" (Araneae, Linyphiidae). Bulletin of the British Arachnological Society 3: 145-155
Morka G H (unpubl.)
Rėlys V, Weiss I (1997) Micrargus alpinus sp. n., eine weitere Art der M. herbigradus-Gruppe aus Österreich (Arachnida: Araneae: Linyphiidae). Revue Suisse de Zoologie 104: 491-501
Roberts M J (1987) The spiders of Great Britain and Ireland. Volume 2: Linyphiidae and checklist. Harley Books Colchester, England, 204 pp.
Rozwałka R, Stanska M (2008) Check-list of spiders (Araneae) of Poland. 1. December 2008. online at http://www.arachnologia.edu.pl/en/species/8-spiders-of-poland.html
Růžička V, Řezáč M (2022a) Seznam pavouků České republiky. List of spiders of the Czech Republic. Online at https://www.arachnology.cz/seznam-pavouku-cr-26.html and https://www.arachnology.cz/en/seznam-pavouku-cr-26.html
Scharff N, Gudik-Sørensen O (2006) Katalog over Danmarks edderkopper (Araneae). Catalogue of the spiders of Denmark (Araneae). Entomologiske Meddelelser 74: 3-71
Thaler K (1999b) Beiträge zur Spinnenfauna von Nordtirol - 6. Linyphiidae 2: Erigoninae (sensu Wiehle) (Arachnida: Araneida). Veröffentlichungen des Tiroler Landesmuseums Ferdinandeum 79: 215-264
Vilbaste A (1987) Eesti Ämblikud (Aranei). Annoteeritud nimestik. Estonian spiders (Aranei). An annotated check list. Valgus, Tallinn. 113 pp. & 512 maps on 67 unpag. pages
Weiss I, Petrișor A (1999) List of the spiders (Arachnida: Araneae) from Romania. Travaux du Muséum National d’Histoire Naturelle “Grigore Antipa” 41: 79-107
Wiśniewski K, Rozwałka R, Wesołowska W (2018) Distribution, habitat affinities and phenology of the Micrargus herbigradus-species group (Araneae: Linyphiidae) in Poland. Biológia (Bratislava) 73: 151-164
WSC (2026) World Spider Catalog. Version 27. Natural History Museum Bern, online at http://wsc.nmbe.ch (13.2.2026) doi: 10.24436/2
Updates
| 02-10-2025 | Distribution update | Detail |
| 16-02-2023 | Distribution insert | Detail |
| 16-11-2022 | Distribution update | Detail |
| 05-10-2022 | Image insert | |
| 01-10-2022 | Gallery image insert | |
| 29-04-2022 | Image insert | |
| 03-11-2020 | Distribution insert | Detail |
| 05-04-2018 | Image insert | |
| 22-08-2014 | Image insert | |
| 28-04-2013 | Distribution update | Detail |