What Sponge Am I

Stock Photo: Purple blue sponge with beautiful 3-D structure

I have no idea what kind of sponge this is. When I found it on the bottom of Mahurangi Harbour, I was attracted by its colour, shape and especially the translucency that made the supporting structure (endoskeleton) visible. Anyway, so far I could not find out what its name is.

Keywords: sponge purple blue structure translucent underwater undersea temperate Pacific ocean current tidal flow Mahurangi Harbour