New research reaches back half-a-billion years to reveal the history of the tunicate, one of the most alien-looking creatures on Earth
was a source of endless fascination. But while the dinosaur and mastodon skeletons were fun to look at, it was always the weirder and more ancient specimens that caught his eye.
At the centre of the work is an early and remarkably well-preserved fossil of a tunicate, also known as a sea squirt, which appears to be surprisingly similar to those that live in the ocean today. Exactly how they relate is a harder question to answer because tunicates lack bones, teeth, shells or exoskeletons that would allow them to show up in the fossil record.
It also shows that the tunicate body design, and the survival strategy that goes with it, was already in place during the Cambrian period, when all of the major animal groups such as vertebrates, arthropods, molluscs and others, appeared.El Niño, the climate wild card, is back. Scientists are racing to predict its impact on Canada
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