Rapetosaurus: my what a big pubis you have!!

Rapetosaurus krausei
(Curry, Rogers & Forster, 2001) is a Late Cretaceous titanosaur sauropod that is known from several bits and pieces from 3 adults, plus the majority of a juvenile specimen (Fig. 1). Adult lengths are estimated up to 15 m.

Figure 1. Rapetosaurus in traditional quadrupedal and imagined bipedal poses. Here that giant pubis is carrying a big gut.

Figure 1. Rapetosaurus in traditional quadrupedal and imagined bipedal poses. Here that giant pubis is carrying a big gut.

In the large reptile tree (LRT, 1293 taxa) Rapetosaurus nests with the much taller and longer Diplodocus. Rapetosaurus has a much larger pubis for no better reason than to help support its guts when bipedal.

Figure 2. Rapetosaurus skull compared to other sauropods.

Figure 2. Rapetosaurus skull compared to other sauropods. That long antorbital fenestra on Rapetosaurus appears to be a combination of the maxillary fenestra seen in Tapuiasaurus. Note: every facial bone has less bone in Rapetosaurus.

The down-turned snouts here
reflect their angle relative to the occiput and probably the semi-circular canals.

References
Curry Rogers K and Forster CA 2001. The last of the dinosaur titans: a new sauropod from Madagascar. Nature. 412: 530–534. doi:10.1038/35087566

https://en.wikipedia.org/wiki/Rapetosaurus

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