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Cork-Lid Trapdoor Spider (Ummidia spp.)

Detailing the identifying qualities of the Cork-Lid Trapdoor Spider, including physical features and territorial reach.

 Updated: 8/8/2017; Authored By Staff Writer; Content ¬©

  Cork-Lid Trapdoor Spider  
Picture of Cork-Lid-Trapdoor-Spider

Shallow bunkers covered with spider silk and debris hide stealthy Cork-Lid Trapdoor Spiders from unsuspecting nearby prey.

The 'hider' also does the seeking in this life-and-death game of "What's for Dinner". Cork-Lid Trapdoor Spiders dig out tunnels in the ground close to walkways used by bugs, lizards and small mammals using their mouthparts and legs. This increases the likelihood of catching something. They use their silk to create a lid to cover it. The lid is made to fit the exact size of the opening, like a cork in a bottle. The spider also gives it a hinge so it can run out to attack or chase down and insect without losing it. The lid closes on its own, concealing the retreat. Once the spider senses the presence of a passerby (likely by vibration or tremors), it flips up the trapdoor, grabs its meal, it returns to the retreat to consume it.

This family of spiders are smaller and less hairy than Tarantulas, but they come from the same infraorder so they are distant relatives. Females use the tunnel to lay eggs and raise young spiderlings. Unlike other types of spiders, the mother stays in the nursery, protecting them from parasitic predators like wasps until the spiderlings are able to forge out on their own.

Cork-Lid Trapdoor Spider Information

Category: Spider
Common Name: Cork-Lid Trapdoor Spider
Scientific Name: Ummidia spp.

Taxonomy Hierarchy

 Arrow graphic Kingdom: Animalia
  Arrow graphic Phylum: Arthropoda
   Arrow graphic Class: Arachnida
    Arrow graphic Order: Araneae
     Arrow graphic Family: Ctenizidae
      Arrow graphic Genus: Ummidia
       Arrow graphic Species: spp.

Size, Identifying Tags and Territorial Reach

Size (Adult, Length): Size (Adult, Length): 15 mm to 18 mm (0.585 inches to 0.702 inches)
Identifying Colors: black, white
Additional Descriptors: shiny, fast, round, rings, bands, hairy, divot, dimple, door

North American Territorial Reach (Though Not Limited To): Alabama; Arizona; Arkansas; Florida; Georgia; Louisiana; Mississippi; New Mexico; Texas; Virginia; West Virginia; Mexico

A Note About Territorial Reach: Keep in mind that an insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above. Insects are driven by environmental factors, food supplies and mating patterns and do not nescessarily work within hard-and-fast territorial lines like we humans do.

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