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Amaurobius borealis Emerton, 1909

	FAMILY: AMAUROBIIDAE Thorell, 1870     Genus: Amaurobius C. L. Koch, 1837         Species: Amaurobius borealis Emerton, 1909
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Family Common Name:  hackledmesh weavers
Genus Common Name:  none
Species Common Name:  none

Global Distribution: USA, Canada
Nearctic States & Provinces: AB SK MT NH

Seasonality Specimen Search Specimen list 237, 52

Feeding Guild:^† sheet web builders
^†Feeding guild when noted defined by Uetz, G. W., J. Halaj, and A. B. Cady. 1999. Guild structure of spiders in major crops. Journal of Arachnology 27:270-280. PDF
Habitat (published): under logs and small stones, in deep leaf litter of deciduous and coniferous forests, bogs
Habitat (<30 randomly chosen specimens): Open spruce woods. Surface litter; Basin fen and surrounding Picea mariana woods; Riparian, Conifer closed Forest; Pine forest; Lodgepole Pine closed Forest; Aspen/spruce woods; White spruce heath; Riparian; Aspen/Spruce Ecotone; Sifting moss. Pine/aspen forest; Sifting moss. Spruce forest; Wetland; Sage, grassland; Aspen, shrub; Forest area; Spruce forest; Aspen forest; Spruce woods; Riparian, Cobble Stones; Deciduous-dominant forest, 50% standing trees; Under fallen log. Deciduous woods; Sifting moss. Spruce woods; Mixedwood forest; Sask. River valley; Clay Ridge; Forest; Poplar woods;

Life & Natural History: Males have been collected from April to October (May is the peak period) while females have been collected from May to November. Black flies are part of this species' diet

Image(s) of Habitus:

Description: Unformly light brown. Femora paler than carapace and legs darker to their distal ends. Femora and patellae of palpi same color pattern as legs, but tibiae and cymbiae are darker. Opisthosoma pale or dark grey with pale anterior region on dorsal surface with chevrons toward posterior end or unmarked.

Male Dimensions: A = 2.2 mm  A+B = 5 mm  C = 1.6 mm

Image of External Male Genitalia: email an image

Description: Carapace pale yellow-brown and slightly darker toward anterior end. Much the same as males.

Female Dimensions: A = 2.2 mm  A+B = 6 mm  C = 1.5 mm

Image of Epigynum: email an image

Descriptions Source:
Leech, R. E. 1972. A revision of the Nearctic Amaurobiidae (Arachnida: Araneida). Mem. ent. Soc. Can. 84: 1-182.

Amaurobius borealis Emerton 1909 urn:lsid:ubio.org:namebank:2081670

Walmus borealis Chamberlin 1947 urn:lsid:ubio.org:namebank:2081671

Callioplus borealis Kaston 1948 urn:lsid:ubio.org:namebank:2081672

Amaurobius borealis Leech 1972 urn:lsid:ubio.org:namebank:9735878

Amaurobius borealis Paquin & Dupérré 2003 urn:lsid:ubio.org:namebank:2009471

Chamberlin, R. V. 1947. A summary of the known North American Amaurobiidae. Bull. Univ. Utah 38(8): 1-31.

Emerton, J. H. 1909. Supplement to the New England Spiders. Trans. Connect. Acad. Arts Sci. 14: 171-236.

Kaston, B. J. 1948. Spiders of Connecticut. Bull. Conn. St. geol. nat. Hist. Surv. 70: 1-874.

Leech, R. E. 1972. A revision of the Nearctic Amaurobiidae (Arachnida: Araneida). Mem. ent. Soc. Can. 84: 1-182.

Paquin, P. & N. Dupérré. 2003. Guide d'identification des araignées de Québec. Fabreries, Suppl. 11 1-251.

^‡Nomenclature and taxonomic references from the World Spider Catalog

Aitchison-Benell, C. W. & C. D. Dondale. 1990. A checklist of Manitoba spiders (Araneae) with notes on geographic relationships. Naturaliste can. 117: 215-237.

Leech, R. E. 1972. A revision of the Nearctic Amaurobiidae (Arachnida: Araneida). Mem. ent. Soc. Can. 84: 1-182.

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