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