The spider family Leptonetidae includes 271 described species in Europe, Asia, and North and Central America (Platnick 2013), including 40 that occur in North America north of Mexico (Ledford et al. 2005). Many additional species are known that have not yet been formally described (Ledford 2004; Bradley 2013). These tiny spiders are found in damp, dark microhabitats under rocks, in log and leaf litter, and in caves. The web built by some is a small tangle or tightly woven sheet beneath which the spider hangs. When disturbed, it drops from the web and folds its legs close to the body. (Ledford et al. 2005; Bradley 2013)
Leptonetids have six eyes (the anterior median eyes are absent), either in a tight cluster or with one pair set well behind the others; some cave-dwelling species lack eyes altogether.The males of many species have relatively long palps and the female reproductive structures are not visible externally. An unusual feature of this family is that if a spider loses a leg, it usually separates at the joint between the patella and tibia, rather than farther toward the base, between the coxa and trochanter, as in most spiders. (Ledford et al. 2005; Bradley 2013)
Two leptonetids, Tayshaneta microps (=Neoleptoneta microps) and T. myopica (=N. myopica=Leptoneta myopica) are among the handful of spider species listed as endangered under the U.S. Endangered Species Act (Ledford et al. 2012) (Ledford et al. [2011] concluded that Neoleptoneta was paraphyletic and segregated the species in the genus into several different genera).
Ledford (2004) reported on the morphology, distribution, and natural history of Calileptoneta, including an account of courtship and mating in Calileptoneta ubicki.
Leptonetidae is a family of small spiders adapted to live in dark and moist places such as caves.[1] The family is relatively primitive having diverged around the Middle Jurassic period.[2] They were first described by Eugène Simon in 1890.[3]
Leptonetids are small, with most falling between 2 and 5mm in total length.[2] They are generally pale in color and feature a greenish or bluish shine due to microscopic texture on the cuticle of their exoskeleton.[1] Those species which have retained their eyes, have 6 eyes set in a distinctive pattern, with posterior pair set back from the others. If a spider from this family looses a leg, it usually separates between the patella and tibia rather than at the coxa/trochanter joint. [4]
Many live in caves or in leaf litter around the Mediterranean, and in Eurasia, Japan and southern North America.[5]
As of April 2022, the World Spider Catalog accepted the following genera:[5]
Two genera have been moved to the family Archoleptonetidae:[6]
{{cite book}}: CS1 maint: others (link) Leptonetidae is a family of small spiders adapted to live in dark and moist places such as caves. The family is relatively primitive having diverged around the Middle Jurassic period. They were first described by Eugène Simon in 1890.
