Images • Maps • Species Lists • Family Descriptions • Species Descriptions

Robertus banksi (Kaston, 1946)

	FAMILY: THERIDIIDAE Sundevall, 1833     Genus: Robertus O. P.-Cambridge, 1879         Species: Robertus banksi (Kaston, 1946)
	Author: Hancock, John Page views: 720 Write a Review: Visitor Comments: (0)

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

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

Specimen Search Specimen list 7, 13

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, also from avlanche slopes.
Life & Natural History: (not yet recorded or unknown)

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 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 = 1.57 mm  A+B = 3 mm  C = 1.16 mm

Image of External Male Genitalia: Credit: Hancock, John

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 = 1.6 mm  A+B = 3.5 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.

Ctenium banksi Kaston 1946 urn:lsid:ubio.org:namebank:2028024

Robertus banksi Kaston 1946 urn:lsid:ubio.org:namebank:9736951

Ctenium banksi Kaston 1948 urn:lsid:ubio.org:namebank:2028025

Ctenium banksi Kaston 1972 urn:lsid:ubio.org:namebank:2028026

Robertus banksi Brignoli 1983 urn:lsid:ubio.org:namebank:9734439

Robertus banksi Paquin & Dupérré 2003 urn:lsid:ubio.org:namebank:2011662

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

Latest Literature from uBio: