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Limb heterochrony in the thylacine. Relative lengths of thylacine forelimb and hindlimb elements throughout development, shown as shaded grey bars. The thylacine forelimbs begin larger and longer than the hindlimbs, before being overtaken within the first half of pouch development. Limbs are divided into proximal and distal segments: the stylopod (humerus and femur), zeugopod (ulna/radius and tibia/fibula) and autopod (carpals, metacarpals, tarsals metatarsals and digits).
