What are these 'trapdoor spiders' spotted around San Diego?

Sometimes mistaken for small tarantulas, ‘trapdoor spiders’ are native to Southern California.

Orb Weaver Spiders

Phylogenetic treatment and taxonomic revision of the trapdoor spider genus Aptostichus Simon (Araneae, Mygalomorphae, Euctenizidae)

California spider hi-res stock photography and images - Alamy

Mature Male Trapdoor Spider - Eucteniza

California spider hi-res stock photography and images - Alamy

Spooky-looking 'trapdoor spiders' spotted around San Diego

Scientists discovered a super-sized trapdoor spider that is haunting my nightmares

Spiders of North Carolina

Spooky-looking 'trapdoor spiders' spotted around San Diego

California trapdoor spider, Bothriocyrtum californicum

Species delimitation, biogeography, and natural history of dwarf funnel web spiders (Mygalomorphae, Hexurellidae, Hexurella) from the United States / Mexico borderlands