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Home » Guide » Arthropods (Arthropoda) » Chelicerates (Chelicerata) » Arachnids (Arachnida) » Spiders (Araneae) » Mygalomorphs (Mygalomorphae) » Cork-lid trapdoor spiders (Halonoproctidae) » Cyclocosmia » Cyclocosmia truncata
Photo#43659
Trap door spider? - Cyclocosmia truncata - female
Copyright © 2006 Isaac Neeley

Trap door spider? - Cyclocosmia truncata - Female
New Market, Madison County, Alabama, USA
February 24, 2006
Size: 1 1/2 inches
This is a large spider I found in my front yard yesterday in a burrow. I was able to draw it out of the burrow today and capture it so I could take a picture. I will set it free tomorrow. Anyway I believe it is a trap door spider. It had a large abdomen as you can see. The back of its abdomen is flat and harder than the rest of the abdomen. I felt how hard it was when I picked it up(I recommend that nobody ever picks any spider up), but since it was cold outside it wasn't moving around much. I brought it inside and sat it on my floor for a few pictures. What's unusual is that it did not have a covering over the burrow so is it a trap door spider of some kind?
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Contributed by Isaac Neeley on 25 February, 2006 - 9:35pm
Last updated 25 February, 2006 - 11:47pm

I'm thinking Cyclocosmia truncata
See comparison photo here. There is a very cool series of images in the book, Spiders of the Eastern United States, where they show the spider using the end of its abdomen to black the entrance to its burrow.
… Lynette Elliott, 25 February, 2006 - 9:45pm login or register to post comments

 
it is
the striated grooves on the abdomen are distinctive of this genus. two species exist in the USA. C. truncata has 24 rib. i cant remember the species of the other one but it has only 22 ribs
… Omar Fahmy, 25 February, 2006 - 10:20pm login or register to post comments

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