Ickeridae

Ickeridae is a family of spiders in the order Araneae. The family currently includes two genera, Ickerus and Ickera, with about a dozen described species. It was erected in 1999 to accommodate species previously placed in other families that share a distinctive set of traits. Members range from small to medium size, typically 5–12 mm in body length, and display coloration and patterning that help conceal them in leaf litter and understory habitats. Diagnostic features include a distinctive arrangement of eyes and the structure of the male palp and female genitalia, which differentiate Ickeridae from closely related families.

Distribution and habitat: Ickeridae species are found in tropical and subtropical forests across Southeast Asia, parts of Africa, and the Neotropics. They occupy leaf litter, fallen wood, and low vegetation, often in undisturbed habitats, though some species tolerate secondary forests and disturbed habitats.

Ecology and behavior: Like many spiders, they are predators of small insects and other arthropods. Some members are ground-dwellers, while others construct short, inconspicuous silk retreats. Several species exhibit maternal care, with females guarding egg sacs and early instars for extended periods.

Taxonomy and relationships: Molecular analyses have variably placed Ickeridae within Entelegynae, and its closest relatives remain uncertain. Some studies suggest affinities with Corinnidae or Pholcidae, while others propose a more distant relationship. Ongoing taxonomic work aims to clarify its placement and to assess the diversity within the two genera.

Fossil record and etymology: The fossil record for Ickeridae is sparse; the oldest described specimens date from the Miocene, offering limited insight into early diversification. The name derives from the type genus Ickerus, described in 1999, with the standard -idae suffix for spider families.