Cidaris Sea Urchin (No.87)

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Cidaris Sea Urchin (No.87)Cidaris Sea Urchin
Middle Jurassic, 150 Million Years Old

Measurements Approx.
Height - 2 cm
Width - 3.6 cm
Length - 3.6 cm

The Echinoids possess a rigid, globular skeleton made up of columns of thin, calcite plates (ambulacrals and interambulacrals). The plates known as ambulacrals have small pores for tube feet. All plates have swollen tubercles for the ball-and-socket articulation of spines, which are used for defence and some-times for walking. Regular Echinoids, which forage on the sea bed show radial symmetry; irregular Echinoids, which usually burrow in soft sea beds, show bilateral symmetry.


Cidaris sea urchin is a species of urchin that is some times referred to as a pencil sea urchin because of its long spines which would protrude from the body.

Species of Cidaris still live today and can be found in regions of the Atlantic Ocean and Mediterranean.