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Euctenizidae
	Aptostichus sp.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Mygalomorphae
Clade:	Avicularioidea
Family:	Euctenizidae; Raven, 1985
Diversity
	8 genera, 77 species

The Euctenizidae (formerly Cyrtaucheniidae subfamily Euctenizinae) are a family of mygalomorph spiders. They are now considered to be more closely related to Idiopidae.^{[citation needed]}

Etymology

The name comes from the Greek prefix εὖ- (eu-), meaning "valuable" or "good", which had been thought that the family Ctenizidae possess these traits.^[1]

Biology

Many, but not all, make wafer-like doors to their burrows, while others build the cork-like doors found commonly in the true^{[clarification needed]} trapdoor spiders. The biology of nearly all of the species is poorly known.

Distribution

The family occurs almost exclusively in the United States and Mexico. Common U.S. genera include Myrmekiaphila, Aptostichus and Promyrmekiaphila.

Genera

As of October 2020^[update], the World Spider Catalog accepts the following genera:^[2]

Apomastus Bond & Opell, 2002 — United States
Aptostichus Simon, 1891 — United States, Mexico
Cryptocteniza Bond & Hamilton, 2020 — United States
Entychides Simon, 1888 — United States, Mexico
Eucteniza Ausserer, 1875 — Mexico, United States
Myrmekiaphila Atkinson, 1886 — United States
Neoapachella Bond & Opell, 2002 — United States
Promyrmekiaphila Schenkel, 1950 — United States

Footnotes

^ Bond, J. E., B. E. Hendrixson, C. A. Hamilton & M. Hedin. (Bond et al., 2012b) - A reconsideration of the classification of the spider infraorder Mygalomorphae (Arachnida: Araneae) based on three nuclear genes and morphology
^ "Family: Euctenizidae Raven, 1985". World Spider Catalog. Natural History Museum Bern. Retrieved 2019-04-20.

References

{Raven, Robert J. (1985): The spider Infraorder Mygalomorphae (Araneae): cladistics and systematics. Bulletin of the American Museum of Natural History 182: 1–180.
Murphy, Frances & Murphy, John (2000): An Introduction to the Spiders of South East Asia. Malaysian Nature Society, Kuala Lumpur.
Bond, J. E. Phylogenetic treatment and taxonomic revision of the trapdoor spider genus Aptostichus Simon (Araneae, Mygalomorphae, Euctenizidae). ZooKeys 252: 1–209.
Bond, J. E., C. A. Hamilton, N. L. Garrison & C. H. Ray. Phylogenetic reconsideration of Myrmekiaphila systematics with a description of the trapdoor spider species Myrmekiaphila tigris (Araneae, Mygalomorphae, Cyrtaucheniidae, Euctenizinae) from Auburn, Alabama. ZooKeys 190: 94–109.
Bond, J. E., B. E. Hendrixson, C. A. Hamilton & M. Hedin. A reconsideration of the classification of the spider infraorder Mygalomorphae (Arachnida: Araneae) based on three nuclear genes and morphology. PLoS One 7(6): e38753.
Platnick, Norman I. (2014): The world spider catalog, version 14.5. American Museum of Natural History. doi:10.5531/db.iz.0001