I found this in a beach located at Magnisia District in Greece. I found many more like this stuck in rocks, this however was loose. It was a bit hard and very smooth to the touch. It didn't seem to move.

The date I found this was 3rd of August 2023.

The top view of the organism

The bottom view of the organism

  • $\begingroup$ What are your first thoughts? Your first guess? On the name of this marine organism? $\endgroup$ Aug 4 at 17:10
  • $\begingroup$ Looks like some kind of sponge or snail/mollusk type animal or plant? $\endgroup$ Aug 4 at 17:13
  • 2
    $\begingroup$ @BrendanDarrer I believe it's a kidney sponge, although I am not sure. $\endgroup$
    – GeorgeTsak
    Aug 4 at 17:29


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