![]() They have rigid bonelike plates instead of scales, they mainly have cartilage where other fish would have bone, and they have Alien-like protrusible jaws. A member of the group Chondrostei, green sturgeons resemble in some striking ways the ancestors of modern bony fish. The green sturgeon, one of the Bay Delta's largest fish, is emphatically among them. Still, some species seem so similar to their ancestors of millions of years ago that it's hard not to reach for the term. Want to get an evolutionary biologist to roll her eyes at you? Here's one way: refer to a wildlife species as a "living fossil." It's a bit of popular jargon that obscures the fact that every living thing, person or palm tree or protozoan, has gone through the same 3.8 billion years of evolution. Stay with /baydelta for all the project's stories. ![]() And at its core is the Sacramento-San Joaquin Bay Delta. An explanatory series focusing on one of the most complex issues facing California: water sharing.
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