Mangua caswell is a species of Physoglenidae spider endemic to New Zealand.Forster, R. R., Platnick, N. I. & Coddington, J. (1990). A proposal and review of the spider family Synotaxidae (Araneae, Araneoidea), with notes on theridiid interrelationships. Bulletin of the American Museum of Natural History 193: 1-116
Taxonomy This species was described in 1990 by Ray Forster from male and female specimens. The holotype is stored in Te Papa Museum under registration number AS.000108.
Description The male is recorded at 3.49mm in length whereas the female is 3.61mm.
Distribution This species is only known from Fiordland, New Zealand.
Conservation status Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size" and "Data Poor: Trend".
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