Argiope keyserlingi

St Andrew's cross spider
Juvenile female Argiope keyserlingi from Brisbane
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Araneidae
Genus: Argiope
Species:
A. keyserlingi
Binomial name
Argiope keyserlingi
Karsch, 1878

Argiope keyserlingi is a species of orb-web spider found on the east coast of Australia, from Victoria to northern Queensland.[1] It is very similar in appearance to a closely related north Queensland species, Argiope aetherea. A. keyserlingi is commonly found in large populations in suburban parks and gardens, particularly among the leaves of Lomandra longifolia. Like many species of orb-web spiders, A. keyserlingi shows considerable sexual dimorphism, with the females being many times larger than the males. Mature females can be seen during the summer, and seeing multiple males on the web of one female is not uncommon.

A. keyserlingi is commonly known as the St. Andrew's cross spider, due to the construction of bands of silk forming the arms of an X-shaped cross, similar to the one upon which St. Andrew is traditionally said to have been crucified. Juveniles of this species sometimes build a spiral-shaped pattern of silk.[2] Referred to as web decorations or stabilimenta, these bands are thought to increase the species' prey capture rate, but as in other species, they have been found to protect the spider against predators.

A. keyserlingi is an important model species in studies of spider ecology and behaviour. Using this species, scientists have investigated sperm competition, sexual size dimorphism, cryptic female choice, the role of pheromones in mating behaviour, and the function and evolution of web decorations.

Its main predators in Sydney are mantids and birds.[3]

This type of orb-weaver is cathemeral.[4]

  1. ^ Levi H. W. (1983). "The Orb-Weaver Genera Argiope, Gea, and Neogea from the Western Pacific Region (Araneae: Araneidae, Argiopinae)" (PDF). MUSEUM OF COMPARATIVE ZOOLOGY. Harvard University. Retrieved 2018-02-27.
  2. ^ Whyte, Robert; Anderson, Greg (2017). A Field Guide to Spiders of Australia. Clayton South Vic. 3169: CSIRO publishing. p. 80. ISBN 978-0-643-10707-6.{{cite book}}: CS1 maint: location (link)
  3. ^ Blamires, Sean J.; Hochuli, Dieter F.; Thompson, Michael B. (2007). "Does decoration building influence antipredator responses in an orb-web spider (Argiope keyserlingi) in its natural habitat?". Australian Journal of Zoology. 55 (1): 1. doi:10.1071/ZO06098.
  4. ^ "St Andrew's Cross Spider - Argiope Keyserlingi". BrisbaneInsects. January 1, 2009. Retrieved November 13, 2020.