Ascension Sac Spider

Fast Facts

Latin name: Hibana ascensionensis

Notable feature: First spider of this group ever found outside the New World.

Conservation Status: Not Evaluated

Where in the UK: Ascension Island.

Ascension Sac Spider (Hibana ascensionensis) © Danni Sherwood

The Ascension Sac Spider (Hibana ascensionensis) is probably native to Ascension Island. They are beige in colours with massive jars, armed with many teeth. The males have long palps with intricate structures for mating with females.

There is still much to learn about Ascension Sac Spider and the other invertebrates that can be found or are still to be discovered in UK Overseas Territories. Our Supporting Atlantic Territories Invertebrate Conservation project will look to support and strengthen invertebrate conservation in these regions.


  • Size: <5mm
  • Life span: Unknown.
  • Diet: Small invertebrates, generalist predator.
  • Reproduction: Unknown.
  • When to see: Year round, occurs in urban areas on Ascension.
  • Population Trend: Stable.
  • Threats: Non-native species.
  • Fun Fact: Only in 2023 when this species was described was the intricate structure of the chelicerae described and imaged in a scientific journal for the first time.

How you can help:

Buglife is working to increase awareness of invertebrates and the Ascension Sac Spider through specific projects like Supporting Atlantic Territories Invertebrate Conservation. Visit the project page for more information!


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