A brainless and faceless fish

A brainless "fish" without a face, the elusive Amphioxus was seen in the waters off Tankerness in Orkney.

According to marine ecologist, the rarely seen species is not a true fish; it's an evolutionary step between invertebrates and vertebrates. It has a nerve cord running down its back, a precursor to a proper backbone.

The white structure that resembles a spine is actually the species' gonads, which are located in its belly.

(Source)