Table 1. Coefficients of variation (CV) of 12 linear measurements for 18 Phocoena phocoena specimens, along with the mean CV of these measurements from previous odontocete studies (see Table S3 for raw data), the number of studies featuring each measurement (N), and the maximum number of individuals in each of these previous studies.
SSL, length of secondary spiral lamina; W2, Width of basal turn perpendicular to cochlear width; ITD, Inter-turn distance, maximum distance between turns; FC, area of fenestra cochlearis (FC). No previous studies measured intraspecific variation in SSL or extent of SSL.
| This study | Previous studies | |||
|---|---|---|---|---|
| Measurement | CV (%) | Mean CV (%) | N | maximum number of individuals |
| cochlea height | 7.783 | 6.793 | 8 | 12 |
| cochlea width | 4.842 | 3.364 | 4 | 12 |
| number of turns of the cochlear canal | 3.394 | 2.478 | 7 | 5 |
| cochlear volume | 8.015 | 10.23 | 1 | 2 |
| cochlear canal length | 6.189 | 3.401 | 4 | 12 |
| SSL | 6.619 | – | – | – |
| basal ratio | 8.846 | 0.000 | 1 | 2 |
| axial pitch | 8.688 | 8.736 | 5 | 4 |
| extent of SSL | 3.089 | – | – | – |
| W2 | 7.612 | 2.544 | 2 | 5 |
| ITD | 11.93 | 12.622 | 2 | 5 |
| FC | 26.80 | 9.838 | 2 | 5 |