Whales are divided into two groups: the odontoceti, which have teeth, and the mysticeti, or baleen whales. There are 12 species of Baleen Whales including the Bowhead Whale (Balaena mysticetus), Humpback Whale (Megaptera novaeangliae), Blue Whale (Balaenoptera … The bristles of baleen whales are often said to resemble the teeth found on a comb and can be very thin and fine depending on the species of whale. These bristly baleen plates filter, sift, sieve or trap the whales’ favourite prey from seawater inside their mouths. Like the emergence of baleen, tooth loss in whales is evidence of adaptability, suggesting that whales might be able to adapt to challenges posed in the ocean today.

If the website Science News Daily is to be believed, “a living baleen whale (e.g., blue whale, fin whale, humpback, bowhead) has lost its teeth and must sift zooplankton and small fish from ocean waters with baleen or whalebone, a sieve-like structure in the upper jaw that filters food from large mouthfuls of seawater,” (Science News Daily, 2010).

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Baleen whales feed in an entirely different way. Did the Baleen Whales Really Lose their Teeth? Whale ancestors probably never had teeth and baleen at the same time, and only developed baleen after trying toothlessness and sucking in prey. It's much more likely that baleen whales simply lost teeth than that all of those different groups independently evolved teeth. As the new research shows, the ancestors of baleen whales featured sharp, widely spaced teeth and measured about 26 feet long, which is actually quite huge for the time and for a toothed whale. All baleen whales have baleen instead of teeth which they use to collect shrimp-like krill, plankton and small fish from the sea. They are cetaceans. Second, scientists studying whale development have discovered that, in the womb, baleen whales develop teeth and then reabsorb them.

They even beat the largest of the dinosaurs. There are 12 baleen whale species divided into 4 families, each of which has a slightly different feeding method. This strongly suggests that the ancestors of modern baleen whales had teeth and lost them over the course of evolution. There are about 65 different species of toothed whales.Toothed whales, including all dolphins and porpoises, have teeth, only one blowhole (baleen whales have two) and are generally smaller than most baleen whales.The only toothed whale longer than 13 metres is the sperm whale … Baleen Whales (suborderMysticeti) are large marine (saltwater) mammals in the Cetacea family of whales, porpoises, and dolphins. Instead of pearly whites, baleen whales have plates with coarse broomlike bristles. These teeth never erupt and are resorbed as the fetus grows (Talk Origins, 2010).

Full Transcript Baleen whales …

As we shall see, what is often assumed to be evidence from embryology of common descent, can be misleading, i.e. Baleen Whale teeth. The baleen of the bowhead whale can be be 4 metres long. Baleen whale fetuses have teeth and fetal calves have upper front teeth; adult (and probably newborn) baleen whales are toothless (baleen is not teeth), and cows lack upper front teeth. In Greek, mysteceti means "mustachioed whale," while, as you might guess, odontoceti means "whale with teeth." Baleen is made out of keratin, the same protein that makes up our fingernails and hair. Now, Smithsonian scientists have discovered an important intermediary link in the evolution of this innovative feeding strategy: an ancient whale that had neither teeth nor baleen. Baleen whales were named for the long plates of baleen that hang in a row (similar to the teeth of a comb) from their upper gumline. Whales lost their teeth before evolving hair-like baleen in their mouths: Newly described fossil whale in museum collections reveals a surprising intermediate step in their evolution.

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