Mangua secunda is a species of Physoglenidae spider endemic to New Zealand.

[1] This species was described in 1990 by Ray Forster from a female specimen.

The holotype is stored in Otago Museum.

[1] 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".

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