Natural history observations and predatory behaviour of a long-legged jumping spider, Megaloastia mainae (Araneae: Salticidae)

Fernando G. Soley*, R. H. McGinley, S. R. Collins, P. W. Taylor

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The behaviour and natural history of Megaloastia mainae, a long-legged salticid spider that appears to be endemic to northwest Australia, was investigated under natural conditions in the Kimberley Region of Western Australia. Megaloastia mainae is commonly found on rock escarpments, where it spends most of its time on downward-facing horizontal surfaces of large rocks. The diet of M. mainae comprises a variety of insects and spiders, including other salticids and web-building spiders. Megaloastia mainae builds large nests on the surface of the rock escarpment, which are generally occupied for at least several weeks. Contrary to previous reports, we found no evidence that M. mainae builds a prey-capture web or uses its nest as a predatory device. Megaloastia mainae is active during the day, and usually remains within 2 m of its nest. Megaloastia mainae orients to face prey from up to 1.2 m, and can move very quickly across the rock escarpment. Hunting is generally by slow stalking approaches, followed by rapid attacks. The elongated legs of M. mainae may be the result of selection for rapid locomotion in inverted environments. We also found that M. mainae that built nests close to conspecifics were more likely to be missing legs, suggesting that agonistic interactions might be an important source of injury for these spiders.

Original languageEnglish
Pages (from-to)65-83
Number of pages19
JournalNew Zealand Journal of Zoology
Volume43
Issue number1
DOIs
Publication statusPublished - 2 Jan 2016

Keywords

  • Australia
  • endemic
  • Kimberley region
  • locomotion
  • salticid

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