TABLE 1.
Measurements of the bony labyrinth and estimation of the hearing range and best hearing frequency of the varanopids studied
| Mesenosaurus | Mycterosaurus | ROMVP86543 | ROMVP87043 | Aerosaurus | |
|---|---|---|---|---|---|
| Basicranial length (mm) | 15.90 | ‐‐ | 8.86 | 11.60 | 24.39 |
| Vestibule length (mm) | 3.00 | ‐‐ | 3.77 | 2.99 | 4.25 |
| Labyrinth length (mm) | 7.96 | ‐‐ | 8.84 | 8.86 | 11.25 |
| ASC height (mm) | 4.16 | 3.75 | 3.86 | 4.35 | 4.87 |
| ASC width (mm) | 5.34 | 5.51 | 5.43 | 5.57 | 8.16 |
| ASC length (mm) | 9.19 | 8.77 | 9.13 | 9.85 | 13.53 |
| ASC radius of curvature (mm) | 2.37 | 2.31 | 2.32 | 2.48 | 3.26 |
| ASC eccentricity | 0.73 | 0.82 | 0.80 | 0.81 | 0.80 |
| PSC height (mm) | 2.74 | 2.29 | 2.28 | 2.75 | 3.02 |
| PSC width (mm) | 4.61 | 4.02 | 4.37 | 4.56 | 6.28 |
| PSC length (mm) | 6.62 | 5.59 | 5.77 | 6.51 | 7.16 |
| PSC radius of curvature (mm) | 1.84 | 1.58 | 1.66 | 1.83 | 2.33 |
| PSC eccentricity | 0.88 | 0.90 | 0.90 | 0.87 | 0.88 |
| LSC height (mm) | 3.21 | 2.95 | 2.98 | 3.21 | 4.45 |
| LSC width (mm) | 4.67 | 4.87 | 4.29 | 4.94 | 6.13 |
| LSC length (mm) | 5.02 | 6.39 | 5.28 | 5.96 | 8.54 |
| LSC radius of curvature (mm) | 1.97 | 1.95 | 1.82 | 2.04 | 2.64 |
| LSC eccentricity | 0.42 | 0.65 | 0.53 | 0.49 | 0.57 |
| Hearing range (Hz) | 2545.15 | ‐‐‐ | 4806.60 | 3536.05 | 2398.67 |
| Mean best hearing frequency (Hz) | 1597.70 | ‐‐‐ | 2824.44 | 2135.22 | 1518.25 |
| ∠ ASC‐PSC (o) | 85 | 93 | 84 | 87 | 90 |
| ∠ ASC‐LSC (o) | 87 | 88 | 89 | 85 | 96 |
| ∠ PSC‐LSC (o) | 68 | 68 | 63 | 59 | 81 |
Measurements are averaged from both labyrinths, except in Mycterosaurus, where only the right labyrinth can be seen.