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Xysticus alboniger Turnbull, Dondale & Redner, 1965

	FAMILY: THOMISIDAE Sundevall, 1833     Genus: Xysticus C. L. Koch, 1835         Species: Xysticus alboniger Turnbull, Dondale & Redner, 1965
	Author: Hancock, John Page views: 883 Write a Review: Visitor Comments: (0)

General Comments: Known to lay-in-wait on tree trunks and branches (Hancock, pers. obs.).

Family Common Name:  crab spiders
Genus Common Name:  ground crab spiders
Species Common Name:  none

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

Specimen Search Specimen list 1, 1

Feeding Guild:^† ambushers
^†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: Both the ground and field layer of riparian sites, also old spruce stands (Hancock, pers. obs.). Collections have also been made by pitfall traps in bogs, and by sweep nets in grasses, shrubs, and trees.
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 red-black to black. Legs red-black basad, yellow with few white spots and streaks distad. Dorsum of abdomen off-white or gray. Uniformly dark carapace and off-white to gray abdomen. The embolus arises mid-length on the tegulum on the prolateral side (Dondale & Redner, 1978).

Male Dimensions: A = 2.06 mm  A+B = 3.6 mm  C = 1.9 mm

Image of External Male Genitalia: Credit: Hancock, John

Description: Carapace red-black to black. Legs red-black basad, yellow with few white spots and streaks distad. Dorsum of abdomen off-white or gray. Atrium of the epigynum is narrow and elongate (Dondale & Redner, 1978).

Female Dimensions: A = 2.35 mm  A+B = 4.7 mm  C = 2.2 mm

Image of Epigynum: email an image

Descriptions Source:
Dondale, C. D. & J. H. Redner. 1978. The insects and arachnids of Canada, Part 5. The crab spiders of Canada and Alaska, Araneae: Philodromidae and Thomisidae. Research Branch, Agriculture Canada, Publ. 1663: 1-255.

Synaema bicolor Keyserling 1884 urn:lsid:ubio.org:namebank:2107070

Xysticus inornatus Emerton 1892 urn:lsid:ubio.org:namebank:2107071

Synema bicolor Dahl 1907 urn:lsid:ubio.org:namebank:2107072

Synema bicolor Comstock 1912 urn:lsid:ubio.org:namebank:2107073

Synema bicolor Gertsch 1939 urn:lsid:ubio.org:namebank:2107074

Synema bicolor Kaston 1948 urn:lsid:ubio.org:namebank:2107075

Xysticus alboniger Turnbull, Dondale & Redner 1965 urn:lsid:ubio.org:namebank:2012194

Xysticus alboniger Dondale & Redner 1978 urn:lsid:ubio.org:namebank:2107077

Xysticus alboniger Paquin & Dupérré 2003 urn:lsid:ubio.org:namebank:9736747

Comstock, J. H. 1912. The spider book; a manual for the study of the spiders and their near relatives, the scorpions, pseudoscorpions, whipscorpions, harvestmen and other members of the class Arachnida, found in America north of Mexico, with analytical keys for their classification and popular accounts of their habits. Garden City, New York, pp. 1-721

Dahl, F. 1907. Synaema marlothi, eine neue Laterigraden-Art und ihre Stellung in System. Mitt. zool. Mus. Berlin 3: 369-395.

Dondale, C. D. & J. H. Redner. 1978. The insects and arachnids of Canada, Part 5. The crab spiders of Canada and Alaska, Araneae: Philodromidae and Thomisidae. Research Branch, Agriculture Canada, Publ. 1663: 1-255.

Emerton, J. H. 1892. New England spiders of the family Thomisidae. Trans. Connect. Acad. Arts Sci. 8: 359-381.

Gertsch, W. J. 1939. A revision of the typical crab spiders (Misumeninae) of America north of Mexico. Bull. Amer. Mus. Nat. Hist. 76: 277-442.

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

Keyserling, E. 1884. Neue Spinnen aus America. V. Verh. zool.-bot. Ges. Wien 33: 649-684.

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

Turnbull, A. L., C. D. Dondale & J. H. Redner. 1965. The spider genus Xysticus C. L. Koch (Araneae: Thomisidae) in Canada. Can. Ent. 97: 1233-1280.

^‡Nomenclature and taxonomic references from the World Spider Catalog

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