Saurischia

Characters: "lizard-hipped"

*subnarial foramen

*elongation of cervical vertebrae

*large thumb supported by a very broad metacarpal bone

*second finger is longest in manus

Sauropodomorpha (Prosauropods)

Characters: *1. Relatively small skull

*2. Laceolate teeth with serrated crown

*3. At least 10 neck vertebrae

4. Enormous thumb equipped with large claw

*5. Very large foramen in pubis (obturator foramen)

6. Reduction of fifth digit on manus

Genera: Plateosaurus

Sauropoda

Characters: *1. Shortening of rear portion of skull with lower temporal opening situated beneath eye socket.

2. Reduced post orbital bone

*3. 12 or more neck vertebrae

*4. Four or more sacral vertebrae

5. Massive and vertical limbs and solid bones

*6. Pleurocoels or depressions which are not fully developed into hollow spaces.

7. Five toed hands and feet.

Genera: Early Form Vulcanodon

Camarasauridae/Brachiosauridae Camarasaurus, Brachiosaurus

Diplodocidae Diplodocus, Apatosaurus, Mamenchisaurus

Titanosauridae Alamosaurus