The forelimbs of Mierasaurus exhibit many shared (synapomorphic) turiasaurian traits.
In the shoulder girdle of Mierasaurus, the articulation with the scapula on the coracoid is about half the bone's length.
The humerus is slender, with an HRI (humerus robustness index) of only 0.27; the maximum width of the bottom end, similarly, measures only 40% of the bone's total length.
A T-shaped/Y-shaped profile is present at the top end of the ulna due to the strong development of the rear-projecting process.
Besides the depression for articulating with the radius, there is a second deep depression like Moabosaurus, Turiasaurus, Losillasaurus, Zby, and Dystrophaeus.
The top end of the radius is large, being at least half the length, of the bottom end.

Unlike the rounded margins seen titanosauriforms, the front margin of the ilium is triangular in Mierasaurus.
Uniquely, Moabosaurus also has a very short ischium compared to its pubis; the former measures only 75% of the length of the latter, otherwise seen only among titanosaurs.
However, the bulge on the side of the femur is missing, which differentiates Mierasaurus from both titanosauriforms and Moabosaurus (which has a slight bulge).
The fourth trochanter of the femur is only located 40% of the way down from the top of the bone, compared to halfway for most other sauropods, and the condyles at the bottom end are, unusually, roughly the same size.
Synapomorphic of turiasaurs, the cnemial crest of the tibia points forwards.
The inner surface of the astragalus in the ankle narrows to form a triangular process, like Turiasaurus.
On the five-digited foot, the number of phalanges is 2, 3, 3, 2, and possibly 0.
Unlike most other sauropods, with the exception of Vulcanodon and Sanpasaurus, the claws on the second and third digits are compressed vertically, not horizontally.
The forelimbs of Mierasaurus exhibit many shared (synapomorphic) turiasaurian traits. In the shoulder girdle of Mierasaurus, the articulation with the scapula on the coracoid is about half the bone's length. The humerus is slender, with an HRI (humerus robustness index) of only 0.27; the maximum width of the bottom end, similarly, measures only 40% of the bone's total length. A T-shaped/Y-shaped profile is present at the top end of the ulna due to the strong development of the rear-projecting process. Besides the depression for articulating with the radius, there is a second deep depression like Moabosaurus, Turiasaurus, Losillasaurus, Zby, and Dystrophaeus. The top end of the radius is large, being at least half the length, of the bottom end.
Unlike the rounded margins seen titanosauriforms, the front margin of the ilium is triangular in Mierasaurus. Uniquely, Moabosaurus also has a very short ischium compared to its pubis; the former measures only 75% of the length of the latter, otherwise seen only among titanosaurs. However, the bulge on the side of the femur is missing, which differentiates Mierasaurus from both titanosauriforms and Moabosaurus (which has a slight bulge). The fourth trochanter of the femur is only located 40% of the way down from the top of the bone, compared to halfway for most other sauropods, and the condyles at the bottom end are, unusually, roughly the same size. Synapomorphic of turiasaurs, the cnemial crest of the tibia points forwards. The inner surface of the astragalus in the ankle narrows to form a triangular process, like Turiasaurus. On the five-digited foot, the number of phalanges is 2, 3, 3, 2, and possibly 0. Unlike most other sauropods, with the exception of Vulcanodon and Sanpasaurus, the claws on the second and third digits are compressed vertically, not horizontally.
Mierasaurus