Fig. 4. Landmark positions used for the bones of Dicraeosaurus and Amargasaurus. A. Left humerus in anterior aspect, 1. and 4. maximum width of proximal extremity, measured on medial and lateral margin of proximal extremity; 2. and 3. latero-medial width of articular surface of humeral head (3. is also proximal border of deltopectoral crest); 5. peak (highest elevation) of deltopectoral crest; 6. and 7. medial and lateral margin of shaft at distal end of deltopectoral crest; 8. and 11. maximum width of distal extremity, measured on medial and lateral margin of distal extremity; 9. distal medial ridge; 10 distal lateral ridge. B. Left humerus posterior aspect. 1. and 4. maximum width of proximal extremity, measured on medial and lateral margin of proximal extremity; 2. and 3. latero-medial width of articular surface of humeral head; 5. and 6. minimum shaft diameter measured at the medial and lateral margin of the shaft; 7. and 11. maximum width of distal extremity, measured on medial and lateral margin of distal extremity; 8–10. boundary of olecranon fossa. C. Left femur posterior aspect. 1. medial margin of femoral head; 2. lateral margin of femoral head; 3. greater trochanter; 4. lesser trochanter (lateral end); 5. peak (maximum elevation) of 4th trochanter; 6. and 7. minimum shaft diameter measured at the medial and lateral margin of the shaft (7. is also distal end of 4th trochanter); 8. and 12. maximum width of distal extremity, measured on medial and lateral margin of distal extremity; 9. centre of fibular condyle; 10. maximum elevation of lateral condyle; 11. maximum elevation of tibial condyle.