This was a special find of a Euprotomus bulla as they normally have only 2 eyes whereas this one has 4 eyes. The 2 middle eyes are superfluous or anomaly.
This picture was requested by someone who specialises in them for use in their publication paper for the anomaly.
Encountered snorkelling at 2 meters
Ivan Smeets/Guylian Seahorses of the World 2005