Schizocosa mccooki

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Current valid name

Schizocosa mccooki (Montgomery) (family Lycosidae)

Recognition and diagnostic features

Medium to large-sized brown spider, large PME, dark diamond shape over cardiac region.

Related or similar species

Pardosa ramulosa, Hololena nedra


Body lengths when mature: male: 9.1 to 15.5 mm, female: 9.60 to 22.7 mm

Immatures resemble miniature adults.

Egg sac

Wolf spiders carry their egg sacs around on the end of their abdomen until emergence of young, so one should not find a wolf spider egg sac in grapes.


In California: throughout the state

Elsewhere: entire western half of United States, upper Midwestern states, southernmost Canada

Native to North America

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


Wandering hunting spider. Can be found under grape vine bark, but mostly on ground.

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: minor, large enough to bite but pain due to mechanical fang penetration not venom toxicity

Common name

None for species, wolf spiders for family

Taxonomic history

Fairly stable

Selected references

Dondale, C. D., and J. H. Redner. 1978. Revision of the Nearctic wolf spider genus Schizocosa (Araneida: Lycosidae). Canad. Entomol. 110: 143-181.