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

Fall Fund Drive

The Larger Male Orb Weavers

I'm starting this to help us sort out the male orb-weavers. This is mainly for Araneus & Neoscona at this time.

FOUND BOTH IN WEST & EAST

Swollen Legs

Araneus diadematus - 8 mm, Tibia II strong with strong short spines
- No Dorsal Humps

Araneus diadematus


Araneus marmoreus - 6-8 mm, Tibia II swollen with many short stout macrosetae on the prolateral surface
- No Dorsal Humps
- males have black markings one edge of carapace, dorsal pattern very variable
- abdomen has dark posterior oblique marks

Araneus marmoreus


Araneus nordmanni - 8-10 mm, Tibia II swollen/bent with strong macrosetae

Araneus nordmanni


Araneus saevus - 12-14 mm, Tibia II swollen with macrosetae

Araneus saevus


Neoscona crucifera - 9-12 mm, Tibia II swollen prolatterally near base, with 2 uneven rows of short stout mactrosetae
- No Dorsal Humps
- mostly an eastern species, but found across the US in the south
- males have black bands on sides of carapace

Neoscona crucifera



No Swollen Legs

Araneus gemmoides - 5.5-8 mm, legs not modified
- only in the west are some specimens black

Araneus gemmoides


Araneus trifolium - 5-8 mm
- No Dorsal Humps
- abdomen usually white

Araneus trifolium


Eustala anastera - 4-6 mm, femur II with 3-5 ventral macrosetae
- No Dorsal Humps
- dorsal tubercle
- triangular abdomen

Eustala anastera


Neoscona arabesca - 4-9 mm, Tibia II usually curved in northern specimens
- The conspicuous presence of a large number of macrosetae on ventral surface of tibia II is characteristic
- No Dorsal Humps

Neoscona arabesca



MAINLY WEST


Swollen Legs

Araneus andrewsi - 11 mm, Tibia II strong and bent with macrosetae


No Swollen Legs

Araneus gemma - 6-8.5 mm, legs not modified

Araneus gemma


Araneus illaudatus - 5-9 mm, legs not modified
- anterior median white line (most confused with male gemma)

Araneus illaudatus


Neoscona oaxacensis

Neoscona oaxacensis


Eriophora edax - 8-12 mm, legs not modified
- very southern species (TX, AZ, CA)
- light brown with white pigment and tiny black spots at base of setae
- carapace with deep longitudinal groove
- distinct posterior hump

MAINLY EAST

Swollen Legs

Araneus bicentenarius

Araneus bicentenarius


Araneus corticarius - 5 mm, Tibia II swollen
- heavy black border, & mid-line on carapace
- eastern US, but wider dist. in Canada, also in Alaska

Araneus corticarius


Araneus washingtoni - 5 mm, Tibia II swollen with strong setae
- limited to the northern tip of eastern US

Eriophora ravilla - 9-13 mm, Tibia II swollen at base, and basitarsus curved
- very southern species, Gulf coast
- legs banded
- capapace with deep longitudinal groove

Eriophora ravilla



No Swollen Legs

Araneus cavaticus - 10-19 mm, no modified legs
- can easily be recognized by their huge size and long legs

Araneus cavaticus


Araneus iviei - 7 mm (resembles male trifolium)
- black border on carapace
- eastern US, but wider dist. in Canada

Eustala emertoni - 4-5 mm, Femur II lacking macrosetae
- No Dorsal Humps
- No posterior tubercle
- triangular abdomen

Eustala cepina - 3-4 mm, Femur II lacking macrosetae, per Kevin Pfeiffer - no ventral macrosetae on femur I.
- No Dorsal Humps
- Posterior tubercle
- triangular abdomen

Eustala cepina


Neoscona domiciliorum - 8-9 mm, Tibia II nearly straight with 3 rows of clasping spines
- No Dorsal Humps
- May not be brightly colored like females


Resources
(1) The Diadematus Group of the Orb-Weaving Genus Araneus North of Mexico, Levi, 1971.
(2) The Orb Weaver Genus Neoscona in North America by Berman & Levi, 1971. - PDF Here.
(3) The Insects and Arachnids of Canada Part 23, Dondale, Redner, Paquin & Levi, 2003.
(4) The Ravilla Group of the Orbweaver Genus Eriophora in North America by Levi, 1970. PDF Here

Wow! This is great.
You are really beginning to make sense of these males!

 
male orb-weavers
Well, I don't have them down yet. I figure sorting them out here will help me figure them out as I go. Any comments you have about any of the male orb-weavers will be appreciated. =]

 
How do you ...
make the bordered images with the centered text underneath? I can't edit these pages so I can't peek to see how it was done. Edit: Never mind, Lisa B. found it for me. :)

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