Waterea is a genus of intertidal spiders endemic to New Zealand containing the single species, Waterea cornigera.
This species was described by Ray Forster and Cecil Wilton in 1973 from a female specimen. The holotype is stored in Te Papa Museum under registration number AS.000018.
The female is recorded at 5.3mm in length.
This species is only known from East Cape, 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".