New Dinosaur Species Discovered!

Yes it was me! So call it a mark-osaurus! I found the specimen in a local budget store, treating my youngest son to a quality toy. £1.99 aint too much for my kids. Just about. Anyway, the label clearly says Natureworld, and the little fellah certainly always embraces a new creature, his bedroom is veritably full of sea creatures and dinosaurs...

So naturally he loves his new addition to his kiddies zoo. I'm just slightly at a loss as to explain what page in his dinosaur encyclopedia to turn to. Can anyone help us identify this particular specimen, as my edition seems to clearly miss a page or two...