Nearctic States & Provinces: AB AK WA
Collection Locales Mapped by Year Collected:
The Nearctic Spider Database, http://www.canadianarachnology.org/data/spiders/7998
Robertus vigerens (Chamberlin & Ivie, 1933)
FAMILY: THERIDIIDAE Sundevall, 1833
Genus: Robertus O. P.-Cambridge, 1879
Species: Robertus vigerens (Chamberlin & Ivie, 1933)
Author of this page: Hancock, John (Page complete and awaiting review)
Common Names
Family Common Name:
cobweb weavers
Genus Common Name:
none
Species Common Name:
none
Distribution
Global Distribution: USA, Canada, Alaska
Nearctic States & Provinces:
AB AK WA
Collection Locales Mapped by Year Collected:
Natural History, Phenology & Image(s)
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.
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:
Image(s) of Habitus:
Credit: Hancock, John
Details About Males
Description:
Carapace red-brown. Legs uniform dusty yellow with orange metatarsus and tarsus. Abdomen dusty yellow with six red-brown sigillum.
Male Dimensions:
A+B = 2.54 mm
A = (not recorded)
C = (not recorded)
Image of External Male Genitalia:
Credit: Hancock, John
Details About Females
Description:
Carapace red-brown. Legs uniform dusty yellow. Abdomen dusty yellow with six red-brown sigillum.
Female Dimensions:
A+B = 2.75 mm
A = (not recorded)
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.
Synonyms and Chresonyms†
| Garritus vigerens Chamberlin & Ivie 1933 |
| Robertus vigerens Chamberlin & Ivie 1933 |
| Ctenium vigerens Kaston 1946 |
Taxonomic References†
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 accessible at http://research.amnh.org/entomology/spiders/catalog/THERIDIIDAE.html
Natural History References
Blackwall, J. 1864. A history of the spiders of Great Britain and Ireland. London, Ray Society, 2: 175-384.
Other Nearctic Members of Genus Robertus O. P.-Cambridge, 1879‡‡
R. arcticus (Chamberlin & Ivie, 1947) ...............Alaska
R. arundineti (O. P.-Cambridge, 1871) ...............Palearctic
R. banksi (Kaston, 1946) ...............USA, Canada
R. borealis (Kaston, 1946) ...............USA, Canada
R. crosbyi (Kaston, 1946) ...............USA
R. eremophilus Chamberlin, 1928 ...............USA
R. floridensis (Kaston, 1946) ...............USA
R. frontatus (Banks, 1892) ...............USA, Canada
R. fuscus (Emerton, 1894) ...............USA, Canada
R. laticeps (Keyserling, 1884) ...............USA
R. lividus (Blackwall, 1836) ...............Holarctic
R. longipalpus (Kaston, 1946) ...............USA, Canada
R. lyrifer Holm, 1939 ...............Iceland, Scandinavia, Austria, Russia
R. neglectus (O. P.-Cambridge, 1871) ...............Palearctic
R. pumilus (Emerton, 1909) ...............USA
R. riparius (Keyserling, 1886) ...............USA, Canada, Alaska
R. scoticus Jackson, 1914 ...............Palearctic
R. similis (Kaston, 1946) ...............USA
R. spinifer (Emerton, 1909) ...............USA
R. ungulatus Vogelsanger, 1944 ...............Palearctic
‡‡May also include species with Palearctic distribution
Page Reference:
Hancock, John. submitted. Taxonomic and natural history description of FAM: THERIDIIDAE, Robertus vigerens (Chamberlin & Ivie, 1933).
In: The Nearctic Spider Database. David P. Shorthouse (editor). World Wide Web electronic publication. Direct link: http://www.canadianarachnology.org/data/spiders/7998 (Accessed: 10/7/2008 2:36:16 PM).
Author Email Address: spidermanjohn@shaw.ca
Text Last Modified: 2006-03-05T01:45:46Z