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Robertus vigerens (Chamberlin & Ivie, 1933)

	FAMILY: THERIDIIDAE Sundevall, 1833     Genus: Robertus O. P.-Cambridge, 1879         Species: Robertus vigerens (Chamberlin & Ivie, 1933)
	Author: Hancock, John Page views: 672 Write a Review: Visitor Comments: (0)

Family Common Name:  cobweb weavers
Genus Common Name:  none
Species Common Name:  none

Global Distribution: USA, Canada, Alaska
Nearctic States & Provinces: (from the Nearctic Spider Database)   AB AK WA
Collection Locales Mapped by Year Collected: (from the Nearctic Spider Database)

Specimen Search Specimen list 6, 18

Feeding Guild:^† space 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
Recorded Habitats: Most often found at ground level, among rocks, leaf-litter, and moss.
Life & Natural History: The mating web has been reported by Blackwall (1864) as spun high among grass stems. The egg-sac can be found attached to a depression under rocks, which is known in one case to contain 30 eggs.

Seasonality of Specimen Records: (from the Nearctic Spider Database - Requires Flash plug-in - refresh this page if not visible)

Image(s) of Habitus:

Description: Carapace red-brown. Legs uniform dusty yellow with orange metatarsus and tarsus. Abdomen dusty yellow with six red-brown sigillum.

Male Dimensions: A = (not recorded) A+B = 2.54 mm  C = (not recorded)

Image of External Male Genitalia: Credit: Hancock, John

Description: Carapace red-brown. Legs uniform dusty yellow. Abdomen dusty yellow with six red-brown sigillum.

Female Dimensions: A = (not recorded) A+B = 2.75 mm  C = (not recorded)

Image of Epigynum: Credit: Slowik, Joey

Descriptions Source:
Kaston, B. J. 1946. North American spiders of the genus Ctenium. Am. Mus. Novit. 1306: 1-19.

Garritus vigerens Chamberlin & Ivie 1933 urn:lsid:ubio.org:namebank:2028231

Robertus vigerens Chamberlin & Ivie 1933 urn:lsid:ubio.org:namebank:9736964

Ctenium vigerens Kaston 1946 urn:lsid:ubio.org:namebank:2028232

Chamberlin, R. V. & W. Ivie. 1933. Spiders of the Raft River Mountains of Utah. Bull. Univ. Utah 23(4): 1-79.

Kaston, B. J. 1946. North American spiders of the genus Ctenium. Am. Mus. Novit. 1306: 1-19.

^‡Nomenclature and taxonomic references from the World Spider Catalog

Blackwall, J. 1864. A history of the spiders of Great Britain and Ireland. London, Ray Society, 2: 175-384.

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