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Trap Door Spider

Ummidia sp.


A robust medium sized spider, 2.3 cm in body length and looking much bigger with those stocky long legs. All black with a brownish abdomen on which faint darker brown stripes are visible. It was walking fast right down the middle of the street and went under a cement overhang on the curb. It is probably a male out looking for a female. The palpi are long, hairy on the tips, as are all 4 pairs of tarsi. These hairy tarsi (scopulae) are supposed to be a male characteristic. He also has several small pale mites scattered about on his body and legs, maybe hitchhiking. They are supposed to have 6 eyes instead of 8, but the eyes didn't show clearly. This is the first Trap Door Spider I have ever seen and I didn't even think we had them in our area. Family Halonoproctidae.


Found late at night, semi-rural residential area, San Cristobal de Las Casas, Chiapas, Mexico 2,200 meters.


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LaurenZarate a year ago

Thank you Neil and Michael. I had never seen one before at all! I'll have to go out looking for the trap doors now. In all the pictures of these guys, they hold the long palpi in a lyre-shaped position.

Michael Strydom
Michael Strydom a year ago

Wow great spot!! Never seen one out in the open before!

Neil Ross
Neil Ross a year ago

Awesome spider. Well spotted, Lauren.

Spotted by

San Cristóbal, Chiapas, Mexico

Spotted on Apr 7, 2019
Submitted on Jun 17, 2019

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