I need some help figuring it out. (Iguana iguana)

I know for a fact there is the regular green iguana. then the red iguana (which is considered what?)

but, here is where I'm lost.

There are blue green iguanas, considered axanthic? which is lack of red and yellow coloring? Then the albino green iguana. Now, another iguana has made an appearance, and is being named Anetherystic... lack of red? but it makes no sense to me. the "Anetherystic" Iguana has a brown back and face, golden brown eyes, and a white belly. Is it really anetherystic? or would it be considered leucistic? also, what would a xanthic possibly look like?

Can someone break this down, and explain to me what these Iguanas are.

Sure!

Axanthic means a lack of yellow pigment. So, if you take a green iguana and take out the yellow, the color that's left is blue.

I haven't heard of a anerythristic green iguana before, but in snakes the animal tends to be black and white. Leucistic would be a lack of all skin pigments, although eye pigment would still remain, giving you an animal that is all (or mostly) white with dark eyes.