Clubiona rosserae, or Rosser's sac spider,[1] is a rare species of sac spider native to wetlands of Great Britain.

Though once feared to be extinct, a colony was discovered in 2010 at Chippenham Fen in Cambridgeshire.

[2] It can also be found at the Cavenham-Icklingham Heaths Site of Special Scientific Interest (SSSI) in north Suffolk.

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