Sea Urchins are from the Phylum of Echinoderms, which also includes starfish, feather stars, brittle stars and sea cucumbers. Like the starfish, sea urchins have a five-fold symmetry and are made up of many spines. They walk slowly along the sea floor by moving their many tube feet. It is fantastic watching them walk along the sea floor as they hunt for food. Their skeletons are truly beautiful too and it can be lovely to see them decorating the sea floor.

Centrostephanus rodgersii (Rodger's sea urchin)
The most common sea urchin in Sydney, this black sea urchin has long spines  and lives mostly on white rocks so can easily be seen.

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Heliocidaris tuberculata (Tuberculate Sea Urchin)

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Phyllacanthus sp (Pencil Urchin)
This sea urchin is also known as the slate-pencil urchin. This sea urchin is often perched between rocks or deep in overhangs out of reach. I think it looks similar to a cartoon bomb.

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Pseudoboletia indiana (Indian Sea Urchin)
This white sea urchin with purple tipped spines is full of character as it walks along and hides itself with an array of hats made from shells, leaves and anything else it can get its many hundreds of hands on!

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Salmacis sphaeroides (Round sea urchin)