Table 1.
Comparisons among cochlear ‘types’ (Ketten & Wartzok, 1990; Ketten, 1992b). Calculations for Balaenopteridae (NC) (from Pliocene of North Carolina) and Tursiops truncatus (this study) were based on data from Ekdale (2013)
| Taxon | Type | Turns | Pitch | Basal | Slope | Height | Source |
|---|---|---|---|---|---|---|---|
| Basilosauridae | |||||||
| Zygorhiza kochii | – | 2.50 | 2.60 | 0.50 | 0.08 | 6.50 | This study |
| Odontoceti | |||||||
| Inia geoffrensis | I | 1.50 | 1.50 | 0.27 | – | 2.30 | Ketten (1992b) |
| Phocoena phocoena | I | 1.50 | 0.98 | 0.28 | 0.04 | 1.47 | Ketten & Wartzok (1990) |
| Physeter macrocephalus | I | 1.75 | 1.78 | 0.22 | 0.03 | 3.12 | Ketten & Wartzok (1990) |
| Grampus griseus | II | 2.50 | 2.14 | 0.61 | 0.05 | 5.35 | Ketten & Wartzok (1990) |
| Lagenorhynchus albirostris | II | 2.50 | 2.11 | 0.60 | 0.06 | 5.28 | Ketten & Wartzok (1990) |
| Stenella attenuata | II | 2.50 | 1.75 | 0.51 | 0.05 | 4.36 | Ketten & Wartzok (1990) |
| Tursiops truncatus | II | 2.25 | 2.24 | 0.53 | 0.05 | 5.03 | Ketten & Wartzok (1990) |
| Tursiops truncatus | II | 1.70 | 3.60 | 0.50 | 0.10 | 6.20 | This study |
| Mysticeti | |||||||
| Balaena mysticetus | M | 2.00 | 4.30 | 0.50 | 0.08 | 8.50 | This study |
| Balaenoptera acutorostrata | M | 2.50 | 4.00 | 0.70 | 0.07 | 9.90 | This study |
| Balaenopteridae† | M | 2.00 | 4.10 | 0.50 | 0.08 | 8.10 | This study |
| Balaenopteridae (NC)† | M | 2.40 | 5.00 | 0.50 | 0.08 | 12.10 | This study |
| Eschrichtius robustus (neonate) | M | 2.20 | 5.00 | 0.50 | 0.08 | 11.00 | This study |
| Eschrichtius robustus (adult) | M | 2.10 | 4.50 | 0.50 | 0.07 | 9.50 | This study |
| Eschrichtiidae† | M | 2.40 | 4.40 | 0.60 | 0.08 | 10.60 | This study |
| Eubalaena glacialis | M | 2.40 | 3.80 | 0.60 | 0.07 | 9.10 | This study |
| ‘Megaptera’ miocaena† | M | 2.70 | 3.60 | 0.70 | 0.06 | 9.60 | This study |
| Megaptera novaeangliae | M | 2.20 | 4.20 | 0.50 | 0.07 | 9.20 | This study |
Daggers (†) indicate extinct taxa.