Diamantinasaurus This titanosaur was recently discovered in Australia.

Diceratops Was this two-horned dinosaur really a specimen of Triceratops?

Dicraeosaurus A medium-sized, spiny-necked sauropod.

Dilong This "emperor dragon" may have been an ancestor of T. Rex.

Dilophosaurus This dino was distinguished by the bony crests on its noggin.

Dimetrodon This ancient synapsid had a huge sail on its back.

Diplodocus "Thin at one end, much thicker in the middle, and thin again at the far end."

Dollodon Named after the Belgian paleontologist Louis Dollo.