Huda:

Would you kindly furnish details about the collection locality and the associated fauna of this sea Urchin?

Best

Syed 

Dear Dr. Syed, 

Thank you for your response, the urchin species was collected from coral reef region in the North West of Arabian Gulf.

best wishes 

Dear Huda Kadhim Ahmed,

Most probably a spatangid, mayhap Spatangus cf. purpureus

Best wishes,

Huda:

Some affinity suggested with genus Spatangus, but it does not match with S. purpureus. 

Best

Syed