[1] Their bodies are about 2 millimetres (0.079 in) long, and they build extremely delicate webs in the form of a sheet that does not lead to a retreat.

The silk used in these webs is so fine that they are difficult to spot unless they are coated with dew.

[2] They greatly favor locations near water or near moss, and are often found in leaf litter and detritus or on the leaves of shrubs and trees.

[2] The family is named after the type genus Hahnia, which is dedicated to German zoologist Carl Wilhelm Hahn.

[1] As of November 2024[update], the World Spider Catalog accepts the following genera:[3]