Polymastia echinus

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Polymastia echinus
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Hadromerida
Family: Polymastiidae
Genus: Polymastia
Species: P. echinus
Binomial name
Polymastia echinus
Kelly-Borges & Bergquist, 1997

Polymastia echinus is a species of demosponge belonging to the family Polymastiidae. It is only known from shallow subtidal habitats off Goat Island in the far north of North Island, New Zealand.

This is an encrusting sponge with an extraordinary appearance. The sponge is always largely covered in sand, grit and fragments of shells apart from smooth, cylindrical, peach-coloured papillae up to 15 mm in height which are always free of such material. The specific name refers to this rather hedgehog-like appearance.

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