Deinopidae

Deinopidae, also known as net casting spiders, is a family of cribellate[1] spiders first described by Carl Ludwig Koch in 1850.[2] It consists of stick-like elongated spiders that catch prey by stretching a web across their front legs before propelling themselves forward. These unusual webs will stretch two or three times their relaxed size, entangling any prey that touch them. The posterior median eyes have excellent night vision, allowing them to cast nets accurately in low-light conditions. These eyes are larger than the others, and sometimes makes these spiders appear to only have two eyes. Ogre-faced spiders (Deinopis) are the best known genus in this family. The name refers to the perceived physical similarity to the mythological creature of the same name. This genus also includes the humped-back spiders (Menneus).[3]

Deinopidae
Temporal range: Cretaceous–present
Deinopis sp. with web
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Deinopidae
C. L. Koch, 1850
Genera
Diversity
2 genera, 68 species

They are distributed through tropics worldwide from Australia to Africa and the Americas. In Florida, Deinopis often hangs upside down from a silk line under palmetto fronds during the day. At night, it emerges to practice its unusual prey capture method on invertebrate prey. Its eyes are able to gather available light more efficiently than the eyes of cats and owls, and are able to do this despite the lack of a reflective layer (tapetum lucidum); instead, each night, a large area of light-sensitive membrane is manufactured within the eyes, and since arachnid eyes do not have irises, it is rapidly destroyed again at dawn.[4]

Genera
Main article: List of Deinopidae species

Two genera formerly included in this family, Avella O. P-Cambridge, 1877 and Avellopsis Purcell, 1904, are now placed in Menneus. As of April 2019, the World Spider Catalog accepts the following genera:[3]

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See also

References
  1. Coddington, J.A.; Levi, H.W. (1991). "Systematics and Evolution of Spiders (Araneae)". Annu. Rev. Ecol. Syst. 22: 565–592. doi:10.1146/annurev.es.22.110191.003025.
  2. Koch, C. L. (1850). Übersicht des Arachnidensystems. doi:10.5962/bhl.title.39561.
  3. "Family: Deinopidae C. L. Koch, 1850". World Spider Catalog. Natural History Museum Bern. Retrieved 2019-04-20.
  4. "How spiders see the world". Australian Museum. 2018-11-16. Retrieved 2019-01-21.
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