This is a polyclad flatworm, a type of marine flatworm from the order Polycladida.

Its glass-like, translucent body reveals a striking tree-like network of highly branched digestive structures running throughout its body. These structures help distribute digested material, since flatworms lack a specialized circulatory system.

It lives on the seafloor and can glide across surfaces using tiny cilia and muscular movements, creating its graceful, rippling motion.

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