What are tetrapods. First described in 1834, it was the first archaeocete and prehistoric whale known to science. Basilosaurus (meaning "king lizard") is a genus of large, predatory, prehistoric archaeocete whale from the late Eocene, approximately 41.3 to 33.9 million years ago (mya). Describe how otters swim, whales swim, and land mammals run? Basilosaurus had a complete set of leg bones. What Vestigial structure did the basilosaurus have that modern whales do not? [9] The head of Basilosaurus did not have room for a melon like modern day toothed whales, and the brain was smaller in comparison as well. The upper and lower molars and second to fourth premolars are double rooted and high-crowned. As whales began to swim by undulating the whole body, other changes in the skeleton allowed their limbs to be used more for steering than for paddling. Describe the theory of transformation from the sinonyx (wolf like) to whale? Though similar in girth to today’s killer whales, Basilosaurus was more than twice their length (15 to 18 metres). The streamlined body, elongated snout, pectoral fins, and fluke made the Basilosaurus and efficient swimming mammal. The dental formula for Basilosaurus isis is 3.1.4.2 3.1.4.3 . ‘Basilosaurus was a very strange animal, very long and snakelike,’ says Gingerich. The rear legs have continued to reduce in size, and are no longer used for locomotion. When compared to other basilosaurids, the vertebrae of B. cetoides are highly elongated and massive; this is the origin of its great length. Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period. It was first discovered during the 19th century in the United States and was originally thought to have been some kind of prehistoric reptile. It had a vertical spinal that would have been quite flexible in life. Because the sequence of these whales' tail vertebrae matches those of living dolphins and whales, it suggests that early whales, like Dorudon and Basilosaurus, did have tailfins. There are many unknowns about Basilosaurus cetoides despite a strong fossil record; primarily how it swam. While some cryptzoologists note that features of hairy sea monsters maybe evidence for a Basilosaurid whale, Basilosaurus is said to … Perhaps because even trained scientists have a hard time accepting a fully terrestrial mammal as the ancestor of all whales, for a while after its discovery in 1983, Pakicetus was described as having a semi-aquatic lifestyle. The 17 meters (56 feet) long, snake-like Basilosaurus (or “king lizard”) became widespread in the world’s oceans. 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how did the basilosaurus swim

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