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Family Trachelidae

Sac Spider - Trachelas tranquillus Trachelas - female spider - Trachelas Black & gray spider - Meriola arcifera T. pacificus - Trachelas pacificus - female Meriola decepta - female Meriola decepta - female Spider - Trachelas tranquillus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Trachelidae
Other Common Names
Ground Sac Spiders
Synonyms and other taxonomic changes
Meriola and Trachelas were transferred from Corinnidae to the new family Trachelidae by Ramírez, 2014.(1)
11 species in 2 genera found in North America:
Meriola - 3 species
Trachelas - 8 species
Cephalothorax red and abdomen yellow/tan. Legs without spines.

When distinguishing Trachelas from Meriola, it is helpful to look at the posterior row of eyes.

In Meriola, the posterior row of eyes is more closely spaced and straighter.

In Trachelas, they are more widely spaced and the PLEs are set further back - the resulting recurved appearance of the posterior row is easiest seen in a view from above
Exact distribution within these countries will be added when time permits.

under construction

Meriola arcifera (Simon, 1886) - Chile, Bolivia, Argentina. Introduced to USA (California, Hawaii)
Meriola californica (Banks, 1904)- USA, Mexico
Meriola decepta Banks, 1895 * - USA to Guatemala, Colombia, Ecuador, Peru, Brazil

Trachelas huachucanus Gertsch, 1942 - USA, Mexico
Trachelas mexicanus Banks, 1898 - USA, Mexico
Trachelas organatus Platnick & Shadab, 1974 - USA, Mexico
Trachelas pacificus Chamberlin & Ivie, 1935 - USA, Mexico
Trachelas similis F. O. Pickard-Cambridge, 1899 - USA to Costa Rica
Trachelas sinuosus Platnick & Shadab, 1974 - USA
Trachelas tranquillus (Hentz, 1847) - USA, Canada
Trachelas volutus Gertsch, 1935 - USA, Mexico
See Also
Dysdera crocata - Woodlouse Hunter
Print References
The morphology and phylogeny of dionychan spiders
By Ramírez, Martín J.(1)
Internet References
World Spider Catalog (2014). World Spider Catalog. Natural History Museum Bern, online at, version 15.5, accessed on 11/19/2014(2)
Works Cited
1.The morphology and phylogeny of dionychan spiders
Ramírez, Martín J. 2014. Bulletin of the American Museum of Natural History.
2.World Spider Catalog