Lepidotrichia - bony skin rays supporting the fin blade, usually soft, branched, can be shaped like spines and barbs (perch, coelacanth, some catfish).
Lepidotrichia are bony, bilateral paired, segmented fin rays found in bony fish. They develop around actinotrichiae as part of the dermal exoskeleton. Lepidotrichia may have cartilage or bones in their composition. In fact, they are segmented and look like a series of disks stacked one on top of the other. The genetic basis for the formation of fin rays is believed to be the genes encoding the proteins actinodine 1 and actinodine 2.