By the way, are any Titanosauria known from Africa, or was it the
exclusive domain of more basal forms?
Aside from basal forms like _Malawisaurus_, there is _Aegyptosaurus_. This
is a more derived (and possibly indeterminate) titanosaur from the Late
Cretaceous of Egypt. _Algoasaurus_ from South Africa has been called a
titanosaur too; the genus it is probably a nomen dubium. _Janenschia_ has
been called a Late Jurassic titanosaur; but a more recent appraisal suggests
it is actually a camarasaurid (Bonaparte et al., 2000). This last study
also removed the vertebrae from _Janenschia_, and limited this taxon solely
to limb elements; this study also erected the new sauropod genus
_Tendaguria_.
If you include Madagascar, there is the derived titanosaur _Rapetosaurus_
and at least one other (unnamed) form.
Tim
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