Spitting spider

Spitting spiders
Scytodes thoracica
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Scytodidae
Blackwall, 1864
Genera

See text.

Diversity[1]
5 genera, 232 species
Scytodes male, showing pedipalps
Scytodes.fusca.female

Spitting spiders are members of the spider family Scytodidae. There are several genera, of which Scytodes is the best-known. Over 150 species of scytodids have been described worldwide.

Scytodidae catch their prey by spitting a fluid that congeals on contact into a venomous and sticky mass. Remarkably, though it is produced in venom glands in the chelicerae, the fluid contains both venom and spider silk in liquid form. The venom-impregnated silk both immobilizes and envenoms prey such as silverfish. In high-speed footage the spiders can be observed swaying from side to side as they "spit", catching the prey in a crisscrossed "Z" pattern; it is criss-crossed because each of the chelicerae emits half of the pattern. The spider usually strikes from a distance of 10–20 mm and the whole attack sequence is over in a little under 1/700th of a second.[2] After making the capture, the spider typically bites the prey with venomous effect, and wraps it in the normal spider fashion with silk from the spinnerets.[3]

Like the Sicariidae and Diguetidae these spiders are haplogyne (having less complex female genitalia), and have six eyes arranged in three pairs. The Scytodidae differ from the Sicariidae and Diguetidae in having a dome-shaped carapace and in their characteristic flecked pattern of spots.

Some species exhibit presocial behaviour, in which mature spiders live together and assist the young with food.[4]

Genera

As of November 2015, the World Spider Catalog accepted the following genera:[5]

See also

References

  1. ↑ "Currently valid spider genera and species". World Spider Catalog. Natural History Museum Bern. Retrieved 2015-11-16.
  2. ↑ Piper, Ross (2007). Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals. Westport, Conn.: Greenwood Press. ISBN 978-0-313-33922-6.
  3. ↑ Gilbert, C.; Rayor, L.S. (1985). "Predatory behavior of spitting spiders (Araneae, Scytodidae) and the evolution of prey wrapping". Journal of Arachnology. 13: 231–241. JSTOR 3705028.
  4. ↑ Miller, Jeremy (2010). "Taxon page for Scytodes socialis Miller, 2006.". Archived from the original on 2012-03-31.
  5. ↑ "Family: Scytodidae Blackwall, 1864", World Spider Catalog, Natural History Museum Bern, retrieved 2015-11-16
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