The flat centifin split off from it's deep-sea ancestor, the centifin. When it adapted to live in the BigL Coast, it developed fine hairs on the jaws so they can filter out edible particles in the sand. The first jaw develops a distinctive "horn" with chemoreceptive hairs so it can detect the sealplent. The many fins have moved to the underside as the flat centifin moves on the sand. It has changed color to match that of the sand so it can remain unseen in the water. It has been given the name "flat centifin" because it is flat. It is about five centimeters wide.