Erigone dentosa

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Current valid name

Erigone dentosa O. P. Cambridge (family Linyphiidae)

Recognition and diagnostic features

Tiny spider, dark magenta to black colored abdomen and cephalothorax, male carapace elevated and palpal tibia and femora with many large spines and hooks.

Related or similar species

Cryptachaea porteri, Phrurotimpus mateonus, Theridion melanurum, Zelotes nilicola

Spider

Body lengths when mature: male: 2 mm, female: 2.2 mm

Immatures resemble miniature adults.

Egg sac

Description: tiny sac, in depression, flimsy silk covering eggs which are visible through silk, female may guard eggs

Number of eggs per sac: 12.3 ± 6.3

Size of egg: 0.47 ± 0.015 mm

Time of year eggs are likely to be laid: early season to June

Distribution

In California: most of the state

Elsewhere: Washington, Utah

Native to North America

This species has been transported and become established outside of its range.

Biology

Tiny, web-spinning spider. May be very abundant in agroecosystems of various crops, but in grapes appears to disappear prior to harvest.

Status in table grapes

Level of Incidence: can be abundant

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, dwarf spiders for family

Taxonomic history

Stable

Selected references

Crosby, C. R., and S. C. Bishop. 1928. Revision of the spider genera Erigone, Eperigone, and Catabrithorax (Erigoneae). Bull. New York State Mus. 278: 3-74.