About a centimeter in width, it is home to the turret spider, who only comes out at night
Turret spider nest
At the base of a Doug Fir. Can't remember What makes these?
22 Mar 2014.
Susquehanna State Park - Lapidum Landing, Harford Co, MD.
5.9 mm head-abdomen.
Found in a shallow chamber in the earth under a rock in the woods.
ID courtesy of Laura P.:
I guess this is a spider burrow: a conical silk-lined structure incorporating forest debris. Seen in a forest of Douglas Fir and Coast Redwood.
Several others were nearby with smaller apertures; the fourth photo is one of these.
Similar structures with the Foldingdoor Spider Anthrodiaetus riversi have been posted from Pepperwood.
Richard showed us a whole bunch of these structures.
California Turret Spider Burrow
Most of my attempts to illicit strike responses from turret spiders end in failure, but for whatever reason Trent was able to get this one to cooperate. I tried to reciprocate but again without luck. Trent was gently stroking the edge of the turret with a twig, whereas I was poking it, so maybe the key is to immitate a smaller insect. There's anecdotal evidence to suggest that they eat ants, so maybe think ant-sized movements. Also, you need to do it under cover of full darkness for them to be staged near the burrow entrance (though they seemed willing to strike under flashlight illumination).
Note the deep, transverse foveal groove and the sclerite on the abdomen, both indicative of the former genus Atypoides (Adams 2014).