Observed burrow in desert scrub. Maybe A. montanus.
Observed at resting on mat of leaves over water, at the stream edge in forested wetland-stream complex.
This turret is the burrow entrance for the California Turret Spider Antrodiaetus riversi (family Antrodiaetidae). These were found along the East Ridge Trail at Armstrong Woods State Park in Sonoma Co., CA. This makes them part of the "Bay Area clade", a genetically distinct group of turret spiders found through the Coast Range mountains from Santa Cruz County to southern Humboldt County.
This is the burrow entrance of a California Turret Spider (Antrodiaetus riversi, family Antrodiaetidae). Relative of the tarantulas and trapdoor spiders, scattered colonies of turret spiders are found in wooded and chaparral covered areas across much of central and northern California.
Based on their location, these are part of the Valley clade, a genetically distinct collection of spiders found on both sides of Central Valley and in the Sutter Buttes. Oddly, these individuals appear to build conspicuously shorter "turrets" than members of the nearby Monterey and Bay Area clades, even when similar construction materials are available.
This individual was part of a colony on the Moses Springs Trail at Pinnacles National Monument, San Benito Co., CA.
These burrows belong to the California Turret Spider (Antrodiaetus riversi, family Antrodiaetidae). This is part of an ancient group of spiders in the same suborder as the tarantulas and trapdoor spiders (Mygalomorphae). Based on research by Starrett and Hedin (2007) these individuals are part of the Monterey clade, a geographically and genetically isolated population of these fascinating spiders.
They are nocturnal hunters, waiting at night at the entrance of their turrets. When an insect walks across one of pine needles or other debris woven into their turret, it acts as a trigger, signaling to the spider the prey's location and size.
This one used lichen in its turret construction, a choice that we endorsed whole-heartedly. Also, Trent is the best turret tickler ever.