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Genus Microlinyphia - Platform spiders

Ant-mimic spider - Microlinyphia - male Black and silvery white spider - Microlinyphia mandibulata Linyphiidae: Microlinyphia? - Microlinyphia mandibulata Possible Dwarf or Sheetweb - SK - Microlinyphia striped linyphiidae - Microlinyphia dana - female Spider - Microlinyphia - male Brown Spider on Rabbitbrush - Microlinyphia mandibulata Antmimic Spider? - Microlinyphia
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Linyphiidae (Sheetweb and Dwarf Spiders)
Subfamily Linyphiinae (Sheetweb Spiders)
Genus Microlinyphia (Platform spiders)
4 species and 1 subspecies in BugGuide's range (North America north of Mexico)
relatively small (less than 6mm in body length)
Microlinyphia dana: specimens collected in AK, CA, OR, WA, BC
Microlinyphia impigra: specimens collected in AK, NY, OH, WA, BC, MB, ON, SK, YT
Microlinyphia mandibulata mandibulata: specimens collected in AK, CT, GA, MI, NE, NH, NJ, NY, OH, UT, WA, WI, AB, MB, NB, NF, ON, QC, SK
Microlinyphia mandibulata punctata: specimens collected in AZ, CA, ID, OR, UT, WA, BC
Microlinyphia pusilla: specimens collected in AK, CO, ID, MT, WA, WY, AB, BC, MB, NT, QC, SK, YT

The initials for states and Canadian provinces listed here were taken from this resource--(1)
See Also
Males of this genus may be confused with other spiders that have a constricted abdomen; Microlinyphia males have a long, wiry embolus that turns a full circle larger than the pedipalp itself; both Neriene & Microlinyphia males have a much longer carapace than Coleosoma.

    Coleosoma                   Microlinyphia                 Neriene
Print References
Paquin, P. & N. Dupérré, 2003. Guide d'identification des araignées de Québec. Fabreries, Suppl. 11 1-251. -- contains diagnostic diagrams for M. m. mandibulata & M. pusilla
Internet References
~ Norman Platnick's "World Spider Catalog" for currently recognized species and subspecies as well as distribution by country:
~ - Image of a Microlinyphia mandibulata from WA.
Works Cited
1.Contributions à la connaissance des Araignées (Araneae) d'Amérique du Nord. Fabreries, Supplément 10.
Pierre Paquin & Donald J. Buckle. 2001. Association des entomologistes amateurs du Québec inc. (AEAQ).