The complete femur that was assigned to Argentinosaurus is 2.5 metres (8.2 ft) long.
The femoral shaft has a circumference of about 1.18 metres (3.9 ft) at its narrowest part.
Mazzetta and colleagues used regression equations to estimate its original length at 2.557 metres (8.39 ft), which is similar to the length of the other femur, and later in 2019 Paul gave a similar estimate of 2.575 metres (8.45 ft).
By comparison, the complete femora preserved in the other giant titanosaurs Antarctosaurus giganteus and Patagotitan mayorum measure 2.35 metres (7.7 ft) and 2.38 metres (7.8 ft), respectively.
While the holotype specimen does not preserve a femur, it preserves a slender fibula (originally interpreted as a tibia) that is 1.55 metres (5.1 ft) in length.
When it was identified as a tibia, it was thought to have a comparatively short cnemial crest, a prominent extension at the upper front that anchored muscles for stretching the leg.
However, as stated by Mazzetta and colleagues, this bone lacks both the proportions and anatomical details of a tibia, while being similar in shape to other sauropod fibulae.
The complete femur that was assigned to Argentinosaurus is 2.5 metres (8.2 ft) long. The femoral shaft has a circumference of about 1.18 metres (3.9 ft) at its narrowest part. Mazzetta and colleagues used regression equations to estimate its original length at 2.557 metres (8.39 ft), which is similar to the length of the other femur, and later in 2019 Paul gave a similar estimate of 2.575 metres (8.45 ft). By comparison, the complete femora preserved in the other giant titanosaurs Antarctosaurus giganteus and Patagotitan mayorum measure 2.35 metres (7.7 ft) and 2.38 metres (7.8 ft), respectively. While the holotype specimen does not preserve a femur, it preserves a slender fibula (originally interpreted as a tibia) that is 1.55 metres (5.1 ft) in length. When it was identified as a tibia, it was thought to have a comparatively short cnemial crest, a prominent extension at the upper front that anchored muscles for stretching the leg. However, as stated by Mazzetta and colleagues, this bone lacks both the proportions and anatomical details of a tibia, while being similar in shape to other sauropod fibulae.
Argentinosaurus