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Heteraster Sea Urchin, from France (No.7)

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Heteraster Sea Urchin, from France (No.7)Heteraster Sea Urchin, from France
120 Million Years, Lower Cretaceous

Measurements Approx.
Height - 3.5 cm
Width - 1.8 cm
Length - 3.2 cm



Echinoids (Sea Urchins)
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.

  

Heteraster is an extinct genus of Sea Urchin, a slow moving urchin which lived during the Cretaceous period, approximately 120 million years  





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