Nearctic States & Provinces: AB
Collection Locales Mapped by Year Collected:
The Nearctic Spider Database, http://www.canadianarachnology.org/data/spiders/7958
Robertus banksi (Kaston, 1946)
FAMILY: THERIDIIDAE Sundevall, 1833
Genus: Robertus O. P.-Cambridge, 1879
Species: Robertus banksi (Kaston, 1946)
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
Nearctic States & Provinces:
AB
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, also from avlanche slopes.
Life & Natural History:
(not yet recorded or unknown)
Seasonality of Specimen Records:
Image(s) of Habitus:
Credit: Hancock, John
Details About Males
Description:
Carapace glabrous, orange, somewhat darker on the head and with eyes ringed with black. Legs yellow to orange, lighter on femora, darkest distally. Abdomen gray with four dorsal sigillum. The cymbium is provided with three stout apical setae (Kaston, 1946).
Male Dimensions:
A+B = 3 mm
A = 1.57 mm
C = 1.16 mm
Image of External Male Genitalia:
Credit: Hancock, John
Details About Females
Description:
Carapace glabrous and higher than male, orange, somewhat darker on the head and with eyes ringed with black, furrow is more marked than male. Legs yellow to orange, lighter on femora, darkest distally. Abdomen gray with four dorsal sigillum. U-shaped anterior median lobe of the epigynum, with minute openings on either side (Kaston, 1946).
Female Dimensions:
A+B = 3.5 mm
A = 1.6 mm
C = 1.24 mm
Image of Epigynum:
Credit: Hancock, John
Descriptions Source:
Kaston, B. J. 1946. North American spiders of the genus Ctenium. Am. Mus. Novit. 1306: 1-19.
Synonyms and Chresonyms†
| Ctenium banksi Kaston 1946 |
| Robertus banksi Kaston 1946 |
| Ctenium banksi Kaston 1948 |
| Ctenium banksi Kaston 1972 |
| Robertus banksi Brignoli 1983 |
| Robertus banksi Paquin & Dupérré 2003 |
Taxonomic References†
Brignoli, P. M. 1983. A catalogue of the Araneae described between 1940 and 1981. Manchester Univ. Press, 755 pp.
Kaston, B. J. 1972. How to know the spiders, second ed. Dubuque, pp. 1-289.
Kaston, B. J. 1948. Spiders of Connecticut. Bull. Conn. St. geol. nat. Hist. Surv. 70: 1-874.
Kaston, B. J. 1946. North American spiders of the genus Ctenium. Am. Mus. Novit. 1306: 1-19.
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 accessible at http://research.amnh.org/entomology/spiders/catalog/THERIDIIDAE.html
Other Nearctic Members of Genus Robertus O. P.-Cambridge, 1879‡‡
R. arcticus (Chamberlin & Ivie, 1947) ...............Alaska
R. arundineti (O. P.-Cambridge, 1871) ...............Palearctic
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
R. vigerens (Chamberlin & Ivie, 1933) ...............USA, Canada, Alaska
‡‡May also include species with Palearctic distribution
Page Reference:
Hancock, John. submitted. Taxonomic and natural history description of FAM: THERIDIIDAE, Robertus banksi (Kaston, 1946).
In: The Nearctic Spider Database. David P. Shorthouse (editor). World Wide Web electronic publication. Direct link: http://www.canadianarachnology.org/data/spiders/7958 (Accessed: 10/7/2008 5:33:52 PM).
Author Email Address: spidermanjohn@shaw.ca
Text Last Modified: 2006-03-05T01:50:08Z