Dictyna calcarata
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adult female, live |
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adult male, live |
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female genitalia; epigynum |
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female genitalia; epigynum |
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male genitalia; palp, ventral view |
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grape size comparison with adult spiders; male (left), female (right) |
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spiderling, live |
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spiderlings, dead; dorsal (left), ventral (right) |
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egg sac, dome shaped |
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egg sac with scale (cm) |
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egg sac, suspended in silk |
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diagnostic feature; cephalic hairs |
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.
