Simon-1897
Guides
Liocranidae
sac spiders
Liocranidae is a family of araneomorph spiders first described by Eugène Simon in 1897. They are commonly referred to as 'sac spiders' due to their habit of constructing silk retreats. The family contains 35 genera and approximately 357 species as of January 2026. The holarctic genus Agroeca is the best-known member, while many other genera remain poorly studied and lack formal diagnoses. Recent taxonomic work has significantly expanded the family, including the description of numerous new species from China, Vietnam, and other regions.