According to his resume, 'slurking through the murky estuaries munching fishy and amphibious snacks, looking fearsome as all-get-out' was one of Listracanthus top skills. The sharp feathery denticles that ran along the top from nose to fin are up for some debate as to their function, ranging from protection to electronic signaling or hunting like modern day electric eels. We can't rule out fashion though, because think about it. In an age filled with weird lizard sharks and strange cartilaginous fish, having a feathered up-do will get you noticed...