Xysticus californicus

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Current valid name

Xysticus californicus Keyserling (family Thomisidae)

Recognition and diagnostic features

Crab-like in appearance with front two pairs of legs much longer than hind two pairs, dark brown coloration.

Related or similar species

Xysticus locuples, Bassaniana utahensis


Body lengths when mature: male: 4.0 - 5.0 mm, female: 6.5 - 7.0 mm

Immatures resemble miniature adults.

Egg sac

No egg or egg sac information is available for this species


In California: throughout much of state

Elsewhere: Canada

Native to North America

This species has not been transported or become established outside of its range.


Sit-and-wait predator. Collected from March to July.

Status in table grapes

Level of Incidence: uncommon

Level of Concern in New Zealand: WPNZ (May 2010) nr, BORIC (Dec 2011) nr (not listed), MAF-BPRA (2002) nr (coding definition)

Level of Concern in Australia: WPAU (2006) nr (coding definition)

Level of Medical importance: none

Common name

None for species, crab spiders for family

Taxonomic history


Selected references

Dondale, C. D., and J. H. Redner. 1978. The insects and arachnids of Canada, part 5: The crab spiders of Canada and Alaska (Araneae: Philodromidae and Thomisidae). Agriculture Canada, Ottawa.

Schick, R. X. 1965. The crab spiders of California (Araneida, Thomisidae). Bull. Am. Mus. Nat. Hist. 129: 1-180.