Sea Urchin

Sea Urchin are also known as sand dollars. As an echinoderm, these have a pentameral (five-fold) symmetry to their body organisation, a water vascular system, and an endoskeleton made of calcite plates. They live in shallow marine environments just below the low tide line, buried in the sand or mud.

Country of Origin: Lowbank, Murray River South Australia
Size: 
Small 27mm x 24mm
Medium 30mm x 28mm
Large 37mm x 36mm
Species: Monostychia
Age: Early to Middle Miocene (Batesfordian to Balcombrian)

We only have these three, so you would get the one pictured in the size you order.