Dictyna calcarata

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Current valid name

Dictyna calcarata Banks (family Dictynidae)

Recognition and diagnostic features

Small spider, white hairs on cephalic region of dark cephalothorax, male with massive tibial apophysis on pedipalp, chelicera bowed in middle, mottled abdomen.

Related or similar species

Oecobius navus

Spider

Body lengths when mature: male: 3 mm, female: 2.5 to 4.5 mm

Immatures resemble miniature adults.

Egg sac

Description: small sac, either suspended in silk or attached to surface, angular, eggs typically visible through silk

Number of eggs per sac: 17.7 ± 4.9

Size of egg: 0.56 ± 0.034 mm

Time of year eggs are likely to be laid: May through June

Distribution

In California: throughout the state

Elsewhere: west of a diagonal line drawn from Washington state to Texas, Mexico

Native to North America

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

Biology

Level of Incidence: common

Level of Concern in New Zealand: WPNZ (May 2010) nr, BORIC (DEC 2011) R, MAF-BPRA (2002) nr (coding definition)

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

Level of Medical importance: none

Status in table grapes

Level of Incidence: common

Level of Concern in New Zealand: WPNZ (May 2010) nr, BORIC (DEC 2011) R, 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, meshweb weavers for family

Taxonomic history

Stable

Selected references

Chamberlin, R. V., and W. J. Gertsch. 1958. The spider family Dictynidae in America north of Mexico. Bull. Amer. Mus. Nat. Hist. 116: 1-152.