| 1. | Observations about Cetacea have been recorded since at least classical times.
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| 2. | :The discussion seems to be in the Cetacea article instead.
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| 3. | The group excludes the ralated group of whales ( Cetacea ).
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| 4. | The infraorder Cetacea includes whales, dolphins and porpoises.
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| 5. | The order Cetacea includes whales, dolphins and porpoises.
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| 6. | The order Cetacea is monophyletic; all cetaceans share a common evolutionary ancestor.
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| 7. | Harbor porpoises are the most frequently sighted cetacea.
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| 8. | The traditional order Artiodactyla and infraorder Cetacea are therefore now subsumed into the Cetartiodactyla taxon.
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| 9. | Even the highest estimate is about a third lower than the speed of extant Cetacea.
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| 10. | :As an update, I have run through the cetacea, putting the results here.
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