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

Upcoming Events

BugGuide is a National Moth Week Partner. How to add your National Moth Week 2021 photos. July 17-25.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

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

Previous events


Species Eriophora edax

Spider - Eriophora edax Which spider is this? - Eriophora edax spider - Eriophora edax Eriophora edax - female Large spider with distinctive genitalia - Eriophora edax Araneus diadematus spider? - Eriophora edax - female maybe eriophora edax (has the dimples) - Eriophora edax Araneidae - Eriophora edax
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Araneidae (Orb Weavers)
Genus Eriophora
Species edax (Eriophora edax)
Synonyms and other taxonomic changes
Explanation of Names
Eriophora edax (Blackwall, 1863)
Adult female body length 12-16mm.(1)
Adult male body length 8-12mm.(1)
A nocturnal orbweaver(2) that is variable in color and somewhat variable in shape, too:

"Some specimens have the cephalothorax red-brown and abdomen almost black; others have the cephalothorax yellowish-brown and the abdomen white or yellow-brown. The abdomen may have a folium-like patch or may be almost completely white as in a specimen from Peru. The posterior dorsal hump is distinct in all specimens, but there may be two posterior humps in a row and other humps." "Clypeus dark brown, as is median eye area not including the posterior median eyes but including the anterior lateral eyes."-from Levi 1970(1)


Southwestern United States: mainly southern border of California and Arizona, but also the extreme south of Texas. Also continues south into Peru and Brazil.(1)
Page creation based on the identification of these images by Dr. Lenny Vincent.
See Also
Juvenile specimens of Eustala and Eriophora are often confused.
Works Cited
1.The Ravilla group of the orbweaver genus Eriophora in North America (Araneae: Araneidae)
Herbert W. Levi. 1970. Psyche 77: 280-302.
2.Foraging strategies of Eriophora edax (Araneae, Araneidae): A nocturnal orb-weaving spider
Leonor Ceballos, Yann Hénaut, & Luc Legal. 2005. Journal of Arachnology 33: 509-515.