The ray-finned fishes are so called because they possess lepidotrichia or `` fin rays '' , their fins being webs of skin supported by bony or horny spines -LRB- `` rays '' -RRB- , as opposed to the fleshy , lobed fins that characterize the class PERSON@1 .

Their fins are webs of skin held by bony or horny spines -LRB- `` rays '' -RRB- .
