The Purple Sea Urchin
Walk along the rocky shores of Cyprus and look carefully into a clear tidal pool. Hidden among the stones, you may notice a dark purple sphere covered in long spines. This is the Purple Sea Urchin, one of the most familiar and important marine animals of the Mediterranean Sea. Although it looks like a simple ball of spines, this remarkable creature belongs to an ancient group of animals that has been shaping marine ecosystems for hundreds of millions of years. More Than Just a Sea Creature The Purple Sea Urchin (Paracentrotus lividus) is a marine invertebrate belonging to the echinoderms, the same group that includes sea stars, brittle stars, and sea cucumbers. Unlike fish, sea urchins have no backbone. Instead, they possess a hard shell made of fused calcium plates called a "test," covered with movable spines. These spines help protect the animal from predators and allow it to move slowly across the seabed. In Cyprus, Purple Sea Urchins are commonly found along rocky coastlines from shallow water down to depths of about 20 metres, although they can live much deeper. Survivors from Ancient Seas Sea urchins are among the oldest animal groups still living today. Their ancestors appeared more than 450 million years ago, long before dinosaurs walked the Earth. During this immense span of time, sea urchins witnessed mass extinctions, changing continents, and the…
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