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Name: Cidaris urchin
Echinoids, or Sea Urchins as they are better known, have been present in our seas for around 450 million years, and are still largely present today. Their name derives from the Greek ‘Echin’ (‘Spiny’), referring to their protective spines, and ‘Ooid’ (Egg-Like) in reference to their globular shell, or ‘test’ as it is known. Echinoids are part of a much larger group known as the Echinoderms (‘Spiny-Skins’), which also includes the Asteroids (Starfish), Holothurians (Sea Cucumbers), Crinoids (Sea Lilies and Feather Stars) and the Ophiuroids (Brittle Stars). Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae.SIMILAR TO SEEN: The image shows an example of the single specimen you will receive. This will be picked from our stock box graded and with a size within the minimum and maximum size range indicated. It will not be the exact specimen in the photo, the colours, shape, size and style may vary as with any natural item.