The Japanese Pinecone fish isn’t hard on the eyes. It is, however, hard on the teeth. The pinecone appearance not only comes from its color but also from the way the scales on its body overlap. It ends up looking like heavy platemail armor.
On its sides are spikes running down the length of its body. The spikes apparently are not just superficial scales, but also form part of its skeleton.
In a 2017 study by Stephanie Pappas of the University of Washington published in Livescience, a computed tomography scan done on a Pinecone fish showed that the skeleton was actually one big bony armor. The spikes were divided into small sections called scutes.