An American paleontologist and a team of Egyptians have found the most nearly complete fossilized skeleton of the primitive whale Basilosaurus isis in Egypt's Western Desert, a university spokesman said on Monday.

　　Philip Gingerich of the University of Michigan excavated the well-preserved skeleton, which is about 40 million years old, in a desert valley known as Wadi Hitan (the Valley of the Whales) southwest of Cairo, spokesman Karl Bates told Reuters.

　　"His feeling is that it's the most complete -- the whole skeleton from stem to stern," said Bates.

　　The skeleton, which is 50 feet long, could throw light on why there are so many fossilized remains of whales and other ancient sea animals in Wadi Hitan and possibly how the extinct animal swam, he said.

　　Basilosaurus isis is one of the primitive whales known as archaeocetes, which evolved from land mammals and later evolved into the two types of modern whale.

　　But it looks like a giant sea snake and the paleontologists who found the first archaeocetes thought they were reptiles.

　　Modern whales swim by moving their horizontal fluke up and down in the water, while fish swim by lateral undulations.

　　"The research team will use the new skeleton to study how it lived and swam, and possibly to learn why it so abundant in Wadi Hitan," Gingerich said in a statement.

　　The statement said the skeleton will go to Michigan for preservation and replication. The original will then come back to Egypt for display.