Boffins discover oldest jellyfish fossils dating back 500 mln yearsNovember 14th, 2007 - 8:09 am ICT by admin
“The fossil record is full of circular shaped blobs, some of which are jellyfish. That’s one of the reasons the fossils we describe are so interesting, because you can see a distinct bell-shape, tentacles, muscle scars and possibly even the gonads,” she said.
Co-researcher Bruce Lieberman said, this discovery offered insights into the puzzle of rapid species diversification and development that occurred during the Cambrian radiation, a time when most animal groups appeared in the fossil record 540 million years ago.
She said the fossil record revealed much less about the origin and early evolution of animals such as jellyfish than it did about animals with hard shells or bones.
“The fossil record is biased against soft-bodied life forms such as jellyfish, because they leave little behind when they die. That means that we are still working to solve the evolutionary development of many soft-bodied animals,” said Lieberman.
The researchers said the discovery of the four different types of jellyfish in the Cambrian, provided further evidence that they could be related to the modern orders and families of jellyfish.
The specimens showed the same complexity, which meant that either the complexity of modern jellyfish developed rapidly roughly 500 million years ago, or that the group was even older and was in existence from an earlier date. (ANI)
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Tags: 300, bell shape, bodied animals, cambrian radiation, complexity, discovery, evolution of animals, evolutionary biology, evolutionary development, fossil record, fossils, gonadsmal groups, jellyfish, kansas university, million years, mln, said lieberman, that means that, which meant that