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. Basilosaurus had a complete set of leg bones. The 17 meters (56 feet) long, snake-like Basilosaurus (or “king lizard”) became widespread in the world’s oceans. It is believed that the basilosaurid family in general swam in the manner of modern whales. When compared to other basilosaurids, the vertebrae of B. cetoides are highly elongated and massive; this is the origin of its great length. Describe how otters swim, whales swim, and land mammals run? It had a vertical spinal that would have been quite flexible in life. ‘Basilosaurus was a very strange animal, very long and snakelike,’ says Gingerich. 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. The upper and lower molars and second to fourth premolars are double rooted and high-crowned. Ungulating its spines up and done. The swimming style of basilosaurus has been studied more in recent years. Though similar in girth to today’s killer whales, Basilosaurus was more than twice their length (15 to 18 metres). While some cryptzoologists note that features of hairy sea monsters maybe evidence for a Basilosaurid whale, Basilosaurus is said to … Basilosaurus near to the surface. Months later, with the erratic currents causing major disarray in the fish stocks, the female Basilosaurus had resorted to searching for food in shallow mangrove swamps. The dental formula for Basilosaurus isis is 3.1.4.2 3.1.4.3 . Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period. Describe the theory of transformation from the sinonyx (wolf like) to whale? The rear legs have continued to reduce in size, and are no longer used for locomotion. First described in 1834, it was the first archaeocete and prehistoric whale known to science. What are tetrapods. What Vestigial structure did the basilosaurus have that modern whales do not? It was first discovered during the 19th century in the United States and was originally thought to have been some kind of prehistoric reptile. There are many unknowns about Basilosaurus cetoides despite a strong fossil record; primarily how it swam. 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). If a zeuglodon did have nostrils and a flexible neck, while it might not swim perfectly vertically.. it wouldn't necessarily have to swim perfectly horizontally either, and might be able to keep just it's head on the surface without revealing the body. 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