Sitticus dorsatus

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Current valid name

Sitticus dorsatus (Banks) (family Salticidae)

Recognition and diagnostic features

Mature males are maroon or magenta colored with a white, central, longitudinal stripe on both the cephalothorax and the abdomen. Females are generic looking but have dark brown coloration that is not shared by other jumping spiders in the Central Valley in California.

Related or similar species

Females are nondescript and may be confused with those of the genus Habronattus.

Spider

Body lengths when mature: male: 2.2 mm, female: 3.0 mm

Immatures probably resemble miniature females.

Egg sac

Description: sac made in retreat under bark with female guarding

Number of eggs per sac: one egg sac listed as having 20 eggs

Size of egg: 0.92 ± 0.036 mm

Distribution

In California: southern half of state

Elsewhere: unknown

Native to North America

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

Biology

Solitary hunters. Make egg sacs under bark.

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, jumping spiders for family

Taxonomic history

Stable, but initially described as Sitticus absolutus.

Selected references

Gertsch, W. J., and S. Mulaik. 1936. Diagnosis of some new southern spiders. Amer. Mus. Novitates #863, 15pp.