Acanthopolymastia is a small genus of demosponges. These small, bristly, cushion-shaped sponges are only known from deep-sea sites (to a depth of 3400 m) in the southern oceans.
Species The genus Acanthopolymastia includes the following species: Acanthopolymastia acanthoxa (Koltun, 1964) Acanthopolymastia bathamae Kelly-Borges & Bergquist, 1997 Acanthopolymastia pisiformis Kelly-Borges & Bergquist, 1997 Acanthopolymastia villosa (Kelly-Borges & Bergquist, 1997)
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