Diplodocus
- When: Late Jurassic
(154–152 mya) - Where: North America
- What: Sauropod
- Weight: 10–16 tons
- Length: 24–27 meters
- Diet: Herbivorous
- Discovered: 1878
di
Two
(Greek)
Dimetrodon
- When: Permian
(295–272 mya) - Where: North America
- What: Synapsid
- Weight: 250–300 kg
- Length: 3–4.6 meters
- Diet: Carnivorous
- Discovered: 1878
Dimorphodon
- When: Early Jurassic
(200–190 mya) - Where: Europe
- What: Pterosaur
- Weight: 1–2 kg
- Length: 1.4 meters
- Diet: Insectivorous and piscivorous
- Discovered: 1859
Eudimorphodon
- When: Late Triassic
(210 mya) - Where: Europe
- What: Pterosaur
- Weight: 1 kg
- Length: Wingspan 1 meter
- Diet: Carnivorous
- Discovered: 1970