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For Insects, Spiders & Their Kin
For the United States & Canada
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Genus Ummidia

Unidentified spider - Ummidia Found in NC Goldfish Pond - Ummidia Missouri trapdoor spider - Ummidia - male Two spiders about 50 mm in length - two within a yard of each other - Ummidia Pre-Ballooning Trapdoor Spiderlings - Ummidia Ground Spider? - Ummidia Trap Door Spider - Ummidia Ummidia sp. - Ummidia - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Mygalomorphae (Mygalomorphs)
Family Ctenizidae (Cork-lid trapdoor spiders)
Genus Ummidia
Explanation of Names
Perhaps named for a famous Roman Woman, Ummidia Quadratilla.

Gender: Feminine
Circa 17 mm
saddle-like depression in outer surface of tibia of third leg is a distinctive feature (see example)
Virginia south to Florida, west to California, also neotropics.
Predatory on terrestrial invertebrates
Life Cycle
Dig tunnel in ground and seal with a silk-hinged lid. They hide under this lid and make forays out when prey is sensed, presumably by vibration. Males are often found wandering in late spring, presumably looking for mates.
Guide TBA--PC (print refs, esp.)
Print References
Natural History of the Sonoran Desert ref TBA
How to Know the Spiders ref TBA
Brimley ref TBA