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Species Walckenaeria exigua

Walckenaeria exigua - male Walckenaeria exigua (palp) - Walckenaeria exigua - male
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 Erigoninae (Dwarf Spiders)
Genus Walckenaeria
Species exigua (Walckenaeria exigua)
Synonyms and other taxonomic changes
Current combination: Walckenaeria exigua Millidge, 1983
Tiny to small spiders; body length (excluding legs) of adults ranges from 1.4 - 1.8 millimeters.(1)
Voucher male habitus, pedipalp:
Widespread across the northern half of the continent: Alaska, all of Canada, and the northern USA (as far south as TN in the east).(2)(3)
Published records list sphagnum, on dunes, in fields or grass, in leaf litter, and in woods.(2)
See Also
Males of Walckenaeria minuta are easily mistaken for males of this species; Millidge (1983) even said Emerton himself mistook the two, and that many of the specimens labelled "W. minuta" in the museum collections are [were?] W. exigua. Genitalia of the females are very similar, but not as difficult to separate using the information in the literature (size of posterior plate, etc).
Works Cited
1.Guide d'identification des Araignées (Araneae) du Québec
P. Paquin and N.Dupérré. 2003. Association des Entomologistes Amateurs du Québec.
2.The erigonine spiders of North America. Part 6. The genus Walckenaeria Blackwall (Araneae, Linyphiidae)
A. F. Millidge. 1983. Journal of Arachnology 11: 105-200.
3.Checklist of the spiders (Araneae) of Canada and Alaska
Paquin, Buckle, Duperre, & Dondale. 2010. Zootaxa 2461: 1–170.