[@DashingHeights] I was thinking dimetrodon as well. I do really like Carnotaurs though. (Although I know them from the movie Dinosaur, not the Jurassic Park books my Michael Chricton.) I have so many ideas buzzing around now. I love Anchylosaurus, but I like certain aquatic reptiles like Mosasaur and Leptopterygius, but I don't think there'd be that much in playing aquatic reptiles. I'd be amped to play an archeopteryx, so I think if gorgonopsid doesn't pan out, I may do Archeopteryx and Carnotaur, Carnotaur and Anchylosaur, or a contract organism and one of the aforementioned. Deinonychus could be cool to run into, and at first is what I thought when you said dimetrodon.
But to be fair, seafaring reptiles and flying reptiles aren't technically dinosaurs either, but are in Park/World.