Mamoea cantuaria is a species of Desidae that is endemic to New Zealand.
This species was described by Ray Forster and Cecil Wilton in 1973 from a female specimen. The holotype is stored in Otago Museum.
The full length of the female is not given because the abdomen is damaged.
This species is only known from Canterbury, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size", "Data Poor: Trend" and "One Location".