Nelson cave spider (Spelungula cavernicola)

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Nelson cave spider suspended from cave on silk
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Nelson cave spider fact file

Nelson cave spider description

KingdomAnimalia
PhylumArthropoda
ClassArachnida
OrderAraneae
FamilyGradungulidae
GenusSpelungula (1)

As New Zealand’s largest spider, with an enormous 13 cm leg-span, this species is a startling sight in the limestone caves of the Nelson region where it lives (2) (3). These long-legged spiders are a mottled light brown colour and have very long claws on the first two pairs of legs (2) (4). Extremely rare, the Nelson cave spider is New Zealand's only protected species of spider (3).

Size
Leg-span: 13 cm (2)
Body length: 2.4 cm (2)
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Nelson cave spider biology

These sizeable spiders are hunters that feed on cave weta (Gymnoplectron spp.), large grasshopper-like insects (4). Secured to the wall or ceiling via a drag line, the spider locates its prey and then drops down on top of it, before whisking it away in its grasp (4).

The Nelson cave spider produces large, almost spherical egg sacs that it suspends from the cave ceiling on silk threads (2) (4). Apparently long-lived, these spiders take three to five years to reach mature size, and have a low reproductive rate (5).

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Nelson cave spider range

Known only from a few limestone caves in northwest Nelson, New Zealand (2).

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Nelson cave spider habitat

Found in limestone caves, mainly in complete darkness, usually within 10 to 20 m of the cave entrance, but sometimes much deeper (2).

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Nelson cave spider status

Classified as Data Deficient (DD) on the IUCN Red List 2006.

IUCN Red List species status – Data Deficient

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Nelson cave spider threats

Although classified as Data Deficient (DD) on the IUCN Red List 2006 due to a lack of sufficient information, this spider is believed to be critically endangered and facing a high risk of extinction in the wild (6). The population size is estimated to number fewer than 250 mature individuals (6), and its rarity and restricted habitat mean that the Nelson cave spider occupies an extremely precarious existence (4). No major threats are known, but minor possible threats include rats, cave usage and disturbance, and the collection of egg sacs by cave visitors (2).

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Nelson cave spider conservation

The Nelson cave spider is New Zealand’s only spider legally protected by the Wildlife Act 1953 (3).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For more information on the Nelson cave spider see:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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References

  1. IUCN Red List (October, 2006)
    http://www.iucnredlist.org
  2. McGuinness, C.A. (2001) The conservation requirements of New Zealand’s nationally threatened invertebrates. Threatened Species Occasional Publication 20. New Zealand Department of Conservation, New Zealand. Available at:
    http://www.doc.govt.nz/Conservation/001~Plants-and-Animals/001~Native-Animals/Invertebrates/Conservation-Requirements-of-NZs-Nationally-Threatened-Invertebrates/
  3. Ministry for the Environment: The nature of New Zealand's biodiversity (October, 2006)
    http://www.mfe.govt.nz/publications/ser/ser1997/html/chapter9.5.html
  4. Museum of New Zealand (October, 2006)
    http://www.tepapa.govt.nz/TePapa/English/CollectionsAndResearch/Collections/InsectsSpidersAndSimilar/Spiders/Spiders_Web/What/Nelsoncave.htm
  5. New Zealand Ecology Society Conference, Lincoln University, Canterbury, New Zealand. 30 June – 4 July 1996 (October, 2006)
    http://www.nzes.org.nz/conferences/programmes/NZESconf1996Lincoln.pdf
  6. Mongabay.com (October, 2006)
    http://biodiversity.mongabay.com/animals/s/Spelungula_cavernicola.html
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Image credit

Nelson cave spider suspended from cave on silk  
Nelson cave spider suspended from cave on silk

© Paddy Ryan

Paddy Ryan
Ryan Photographic
2802 East 132nd Circle
Thornton
CO
80241
USA
Tel: +01 (303) 457 9795
paddyaryan@aol.com
http://www.ryanphotographic.com/

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