The Ball-like Sea Urchin (Salmacis sphaeroides) is found in the waters of the Indo – Pacific region and belongs to the echinoderm family Temnopleuridae. It has been recorded in the waters of Malaysia, Singapore, Papua New Guinea, Solomon Islands, Hong Kong and in Australia from northern Western Australia around to Eden in New South Wales. This species can be found from 0 to 90 metres however it is generally found in shallow waters, especially in amongst seagrass meadows. They are generally found to be solitary and they are known to feed on algae and seaweeds.
The Ball-like Sea Urchin (Salmacis sphaeroides) grows to a maximum width of approximately 10cm.