Mamoea cooki is a species of Desidae that is endemic to New Zealand.
This species was described by Ray Forster and Cecil Wilton in 1973 from female specimens. The holotype is stored in Otago Museum.
The female is recorded at 6.10mm in length. The carapace is coloured reddish brow with some light shading. The abdomen is brown with a faint pale chevron pattern dorsally.
This species is only known from Marlborough and Stephens Island, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".