Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

Spider Sign - Webs, Egg Sacs & More

I'm going to start compiling diagnostic web photos... I'll work on the article portion later.


Webs For Hunting

Orb Webs

Orb Weavers (Araneidae)

Araneus


Larinia borealis - note the 'droopiness' of the web - not sure if this is diagnostic


Metepeira - above and to one side is an irregular tangle of threads called a barrier web, and this is where the spider builds its retreat. (1)


Zygiella - missing sections is diagnostic


Argiope aurantia - web usually has vertical zig zag bands also known as stabilimentum - may be more zig zags if made by a juvenile


Argiope argentata / florida (zig zag bands usually diagonal)


Argiope trifasciata - less zig zags noticed for this species


Mangora gibberosa - like the Argiopes I believe the stabilimentum is used more by juveniles


Spined Micrathena (Micrathena gracilis)


Gasteracantha cancriformis - note the tufts on the silk, and the green egg sac


Allocyclosa - vertical line of egg sacs above the spider, debris below.


Cyclosa - vertical line of debris


Ray Orb-weavers (Theridiosomatidae) - These spiders create a web that is attached to a twig in the center of the web creating an umbrella shape (2)
(photo of web needed)

Mecynogea lemniscata - Basilica Orbweaver


Bolas Spiders


Nephilidae
Golden Silk Orbweaver (Nephila clavipes)


Cribellate Orb Weavers (Uloboridae) (cribellate web)


Funnel Webs

Family Agelenidae - Funnel-Web Spiders

Grass Spiders (Agelenopsis)


Tubular Webs

Purseweb Spiders (Atypidae)


Sheet Webs

Sheetweb Spiders (Linyphiinae)

Sierra Dome Spider (Neriene litigiosa)


Bowl and Doily Weaver (Frontinella communis)


Crevice Webs

Family Filistatidae - Crevice Weavers

Kukulcania


Irregular Webs

Cobweb Spiders (Theridiidae)

Western Black Widow


Brown Widows


Theridion simile


N. trigonum       A. elevatus       Rhomphaea projiciens




Hacklemesh Weavers - Amaurobiidae

Mesh Web Weavers (Dictynidae)



Webs For Protection & Retreats

Nursery Webs

Nursery Web Spiders - Pisauridae - Webs for protecting egg sacs, not for hunting.

Dolomedes


Pisaurina



Folded Leaf Retreats

Trachelas


Clubiona? - could possibly be a Miturgidae


Miturgidae



Other Retreats

Pirata retreat


Marbled Cellar Spider (Holocnemus pluchei) - Females of this species make a spherical web around themselves and their egg sacs. (3)



No Webs

Wolf Spiders - Lycosidae - Wolf spiders are the only spiders to hold their egg sacs under their abdomen by the spinnerets and carry their babies on their backs. Many wolf spiders never create any type of web other than a drag line, though some create retreats (Pirata above) and others create silk lined retreats in the ground.



Pirate Spiders - Mimetidae - These spiders sometimes invade the webs of other spiders. They often eat the prey they find there. Their egg sacs are on a web stalk.


References:
1. The Insects and Arachnids of Canada, part 23. The Orb-Weaving Spiders of Canada and Alaska. Dondale, Redner, Paquin & Levi. (1)
2. Spiders and Their Kin by Levi & Levi. (2)
3. Tracks & Sign of Insects and Other Invertebrates by Eiseman & Charney. (3)

Look-a-likes

Ichneumon Wasp Cocoon



Mystery to solve:

Incredibly useful information
Incredibly useful information! Thank you!!

Nice job.
It was quite helpful to find all these images together. Well done. Tools for the next dewy morning.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.