Acanthopolymastia bathamae is a species of sea sponge belonging to the family Polymastiidae.

It is only known from the Papanui Submarine Canyon off Dunedin, South Island, New Zealand.

This is a small, cream-coloured hemispherical sponge up to 8 mm in diameter.

Its texture is soft and velvety with a single central papilla up to 7 mm in height.

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