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Members of this genus include small to moderately-sized mygalomorphs that build subterranean burrows with silken trapdoor entrances (Coyle, 1974; Coyle & Icenogle 1994). Of the 11 described species, 10 are restricted to California, with a single geographically-isolated species (A. isolatus) from mountains in central Arizona. These spiders are found in many different types of habitats, ranging from redwood forest to mesic oak woodland to xeric chaparral or high (Mojave) desert. Within these broader habitat types, spiders are generally found building burrows in sheltered microhabitats, including north-facing banks, ravines, shaded roadcuts, etc.