Original: 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 ( '' rays '' ) , as opposed to the fleshy , lobed fins that characterize the class Sarcopterygii .
Simplified: The ray-finned fishes get their name from the fact that they have lepidotrichia or '' fin rays '' . Their fins are webs of skin held by bony or horny spines ( '' rays '' ) .