Actinopterygii (AKA “ray-finned fish”) is a class of bony fish that comprise over 50% of all living vertebrate species. Most don’t look like these, though: this unidentified (so far!) species of fish belonging to the genus Gadomus have fabulous fins with a single elongated ray emanating outward. According to @NOAAOceanExploration, the order these fish belong to (Gadiformes) are “among the most diverse group of fishes inhabiting deep waters, and in some areas they are the dominant species in term