Do You Know Your Dinosaurs???

Before you read on...

Do you know what kind of dinosaur this is?

OK, so I was playing with Maletch and his dinosaurs (5 minutes ago) and I decided that I would tell/teach him about the 4 kinds of dinosaurs that I know, or at least I thought I knew!!
First, I grabbed the T-Rex, and Maletch said "T- Rex" at the same time as me. John and I looked at each other and we figured he must have learned this from his dinosaur cartoon, 'Dinosaur Train', so that's great!...
I then showed him a Stegosaurus, and Maletch named it, and he also pointed out his 'spikes'.
Then I grabbed this one (in the pic above) ,

and I said, "This is a Pterodactyl."

Maletch said, "It's a Pteranodon."
I thought he couldn't pronounce what I said, so I thought, "good try"... BUT John was falling on the floor laughing- so I asked, "What is so funny?"
John said, "I wasn't going to correct you, I think that is fine that you told him that was a pterodactyl, BUT Maletch is right- it is a Pteranodon!"
Oh my goodness, I just got schooled! I will be buying some dinosaur books, and I will be studying!! I had better learn the different species BEFORE I teach him, and I had better know what I am talking about- because he obviously pays very close attention!