Brief notes on what I have learned and tracked down from various sources on the different kinds of dragons. Please take no offense if you disagree, dragons are imaginative beings and may fit into any form. If you believe I'm missing one or more, please feel free to comment, and I will update.
WYVERN
-no arms, long tail, long neck, strong powerful hind legs, short snout
WYRM
-no legs (back/front), long body, long bottom jaw
NAGA
-serpent body, human torso, single horn
DRAKE
-treasure hoarders, ice/fire, long bodies, short necks, spikes for ice, fans for fire, antlers/horns are predominant
HYDRA
-many heads, wingless, 3 short clawed t