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". A Cork-lid Trapdoor Spider digs out a tunnel in the ground using its mouthparts and legs. It places it close to walkways frequently used by bugs, lizards and small mammals, increasing the likelihood of catching something. Using spider silk, it creates a hinged lid to cover the burrow. A hinge offers easy concealment for the retreat and ensures the burrow will not lose its lid if thrown open quickly. This trapdoor is made to fit the exact size of the opening, like a cork stopper. Once a spider inside the burrow senses the vibration or tremor of a passerby, it flips up the trapdoor, grabs its meal, and drags it into the retreat to consume it.
This family of spiders comprises smaller and less hairy spiders than Tarantulas, but they come from the same infraorder so they are distant relatives. Females also use the tunnel to lay eggs and raise young spiderlings. Unlike other types of spiders, the mother stays in the nursery, protecting her offspring from parasitic predators like wasps until the spiderlings are able to forge out on their own.
Scientific Name: Ummidia spp.
Size (Adult; Length): 15mm to 18mm (0.59in to 0.70in)
Colors: black, white
Descriptors: shiny, fast, round, rings, bands, hairy, divot, dimple, door
Note: 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 as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Legs: Spiders have four pairs of legs and these are attached to the cephalothorax.
Pedipalps: Small appendages near the mouth used as taste and smell organs.
Cephalothorax: Contains eyes, head, mouthparts, and legs.
Abdomen: Contains various organs related to digestion, reproduction, and web-making.
Spinnerets: Used in the production of spider silk for fashioning webs or catching prey.
NOTE: Unlike insects, spiders have both an endoskeleton (internal) and exoskeleton (external).