It seems to has some morphological characteristics of Arbacia lixula, but it has also some differences. Do you know what it might be?
It was taken photo in the last days of August 2019, in a sea cave of a remote beach in South Pelion, Central Greece.
In 2006, two living specimens of Diadema setosum were found in waters off the Kaş peninsula in Turkey. The discovery and subsequent collection of these individuals makes D. setosum the first invasive Erythrean sea urchin in the Mediterranean.Several hypotheses have been proposed for the finding of these individuals. Larvae of the species may have traveled through the Suez Canal (Lessepsian migration) into the Mediterranean from the Gulf of Suez, where the species has a thriving natural population. Another proposed vector is that of foreign ships bringing in individuals via their ballasts.
Thanks for your answer Mostafa A. Khaled . But certain, it is not Diadema setosum.
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