The Mygalomorphae, or mygalomorphs, are an infraorder of spiders, and comprise one of three major groups of living spiders with over 3,000 species, found on all continents except Antarctica. Many members are known as trapdoor spiders due to their creation of trapdoors over their burrows. Other prominent groups include Australian funnel web spiders and tarantulas, with the latter accounting for around one third of all mygalomorphs.
Ctenizidae is a small family of mygalomorph spiders that construct burrows with a cork-like trapdoor made of soil, vegetation, and silk. They may be called trapdoor spiders, as are other, similar species, such as those of the families Liphistiidae, Barychelidae, and Cyrtaucheniidae, and some species in the Idiopidae and Nemesiidae. The name comes from the distinctive behavior of the spiders to construct trapdoors, and ambush prey from beneath them.
The family Cyrtaucheniidae, known as wafer-lid trapdoor spiders, are a widespread family of Mygalomorphae spiders.
Idiopidae, also known as armored or spiny trapdoor spiders, is a family of mygalomorph spiders first described by Eugène Simon in 1889.
Nemesiidae is a family of mygalomorph spiders first described by Eugène Simon in 1889, and raised to family status in 1985. Before becoming its own family, it was considered part of "Dipluridae". The family is sometimes referred to as wishbone spiders due to the shape of their burrows.
Barychelidae, also known as brushed trapdoor spiders, is a spider family with about 300 species in 39 genera.
Aliatypus is a genus of North American folding trapdoor spiders first described by C. P. Smith in 1908. They resemble members of Ctenizidae in morphology and behavior, but this is due to convergent evolution rather than direct relation. They are most closely related to members of Antrodiaetus, which build collar doors. It is likely that the shift from using collar doors to using trapdoors is what allowed them to survive in hot, dry conditions where their closest relatives could not.
Antrodiaetus is a genus of American and Japanese folding trapdoor spiders first described by Anton Ausserer in 1871. The name is a combination of the Greek "antrodiaitos" (αντροδιαιτος), meaning "living in caves", "antron" (αντρον), meaning "cave", and "diaita (διαιτα), meaning "way of life, dwelling".
Atypoides is a genus of North American folding trapdoor spiders. It was first described by Octavius Pickard-Cambridge in 1883, and it has only been found in United States. It was synonymized with the genus Antrodiaetus in 2007, but was restored to its former independent status in 2019. As of November 2021, it contains only three species: A. gertschi, A. hadros, and A. riversi.
Atypoides riversi, known as turret spider, is a species of mygalomorph spider in the family Antrodiaetidae. It is a medium-sized spider native to Northern California that constructs a burrow with a turret made of soil, vegetation and silk. This spider's length is 13 to 18 millimetres long, though females are larger than males.
The Euctenizidae are a family of mygalomorph spiders. They are now considered to be more closely related to Idiopidae.
Hexura is a genus of American folding trapdoor spiders that was first described by Eugène Louis Simon in 1884. As of September 2019 it contains two species, found in the United States: H. picea and H. rothi. Originally placed with Mecicobothriidae, it was moved to Antrodiaetidae in 2019.
Antrodiaetus pacificus is a species of mygalomorph spiders native to the Pacific Northwest. Both male and female were first described by French arachnologist Eugène Louis Simon in 1884 under the name Brachybothrium pacificum. The genus name is a combination of the Greek "antrodiaitos" (αντροδιαιτος), meaning "living in caves", "antron" (αντρον), meaning "cave", and "diaita (διαιτα), meaning "way of life, dwelling". The specific epithet refers to its geographical distribution along the pacific coast of North America, between San Francisco Bay and Alaska. It is the northernmost mygalomorph spider in North America.
Antrodiaetus pugnax is a species of folding-door spider in the family Antrodiaetidae. It is found in the United States.
Antrodiaetus hageni is a species of folding-door spider in the family Antrodiaetidae. It is found in the United States.
Antrodiaetus unicolor is a species of folding-door spider in the family Antrodiaetidae. It is found in the United States.
Antrodiaetus montanus is a species of folding-door spider in the family Antrodiaetidae. It is found in the United States.
Atypoides gertschi is a species of folding-door spider in the family Antrodiaetidae. It is found in the United States.
