Lanthanotherium observatum (extinct)
Found in one sample
United States: Observation Quarry (Middle Miocene)
Size measurements:
| M1 length | 2.38 mm | N = 5 | Korth and Evander 2016 |
| M1 width | 2.62 mm | N = 5 | Korth and Evander 2016 |
| M2 length | 2.02 mm | N = 2 | Korth and Evander 2016 |
| M2 width | 2.55 mm | N = 1 | Korth and Evander 2016 |
| P4 length | 2.50 mm | N = 2 | Korth and Evander 2016 |
| P4 width | 1.85 mm | N = 1 | Korth and Evander 2016 |
| m1 length | 2.87 mm | N = 29 | Korth and Evander 2016 |
| m1 width | 1.81 mm | N = 29 | Korth and Evander 2016 |
| m2 length | 2.39 mm | N = 26 | Korth and Evander 2016 |
| m2 width | 1.72 mm | N = 26 | Korth and Evander 2016 |
| p3 length | 0.99 mm | N = 5 | Korth and Evander 2016 |
| p3 width | 0.83 mm | N = 5 | Korth and Evander 2016 |
| p4 length | 2.21 mm | N = 25 | Korth and Evander 2016 |
| p4 width | 1.43 mm | N = 25 | Korth and Evander 2016 |
See also Lanthanotherium, Lanthanotherium sanmigueli, Lanthanotherium sansaniense