Other genera of Oligocene indricotheres , such as Baluchitherium , Indricotherium , and Pristinotherium , have been named .
No complete specimens exist , making comparison and classification difficult .
Other genera of Oligocene indricotheres , such as Baluchitherium , Indricotherium , and Pristinotherium , have been named , but no complete specimens exist , making comparison and classification difficult .