Bony connexions of the petrosal bone of extant hippos
The Petrosal bone of Prodremotherium sp.
Donrussellia magna Holotype
Reconstruction of the extinct rodent Canariomys bravoi
The inner ear of Megatherium
This model corresponds to a virtually reconstructed bony labyrinth of the right inner ear of the skull MNHN-F-PAM 276, attributed to the extinct giant ground sloth Megatherium americanum. The fossil comes from Pleistocene deposits at Rio Salado (Prov. Buenos Aires, Argentina). The bony labyrinth of Megatherium shows semicircular canals that are proportionally much larger than in the modern two-toed and three-toed sloths. The cochlea in Megatherium shows 2.5 turns, which is a rather high value within Xenarthra. Overall, the shape of the bony labyrinth of Megatherium resembles more that of extant armadillos than that of its extant sloth relatives.
Data citation: Billet G., Germain D., Ruf I., de Muizon C., Hautier L., 2015. M3#14_MNHN.F.PAM276. doi: 10.18563/m3.sf14
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