Martians?

There are features in the Martian soil which look like sea creatures to me.

The large area points to the one that seems most clear: a radially arranged creature, having a central opening. It looks most like a shell from a limpet. I enlarged it at A.

The other enlargement shows what could be the underside of "it," if it were a shell. The arrangement of both radial and concentric elements looks very much like a creatures structure.

The smaller arrows point to features which are similar, but less distinct.

I really wish the image released weren't so compressed. It makes it hard to tell what's real and what's artifact.