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What exactly were these enigmatic fossils, often called the Ediacaran biota? By comparing members of the Ediacaran biota to a range of other groups in a computer analysis of evolutionary relationships, we found that Stromatoveris psygmoglena provides a crucial link between the older period and the animals which appeared in startling number and diversity during the Cambrian period.

Fossils of Stromatoveris psygmoglena are found in only one place in the world: Chengjiang county, China. This region is known for exceptionally well-preserved Cambrian fossils from m years ago.

While the fossil record most often preserves only hard shells or bones, some special sites like Chengjiang preserve the remains of soft-bodied animals, such as Stromatoveris psygmoglena. Originally described in from eight known specimens, we examined over new fossils of the organism that have since been discovered by researchers from Northwest University, China, and dated to the Cambrian period.

The way in which fossils of the Ediacaran Period were preserved has been another of their mysteries. These fossils often show signs of bending, twisting and tearing, suggesting that they preserve soft-bodied organisms without hard parts.

However, there is rarely anything left of the soft tissues themselves. Instead, they left moulds in the surrounding sediment, a little like a footprint on the beach. In contrast, the newly examined Cambrian fossils of Stromatoveris psygmoglena retain carbon-based tissue, allowing us to see the detailed and internal anatomy of the body itself. During a research fellowship at the Tokyo Institute of Technology and the University of Cambridge, the new Cambrian period fossils of Stromatoveris psygmoglena were compared to earlier Ediacaran fossils in a computer analysis of anatomy and evolutionary relationships.

This was also the first analysis to test the relationships between the Ediacaran biota and a range of other organisms, covering single-celled creatures called protozoans, algae, fungi, and nine types of animals, including Stromatoveris psygmoglena. This analysis used over 80 photographs of individual fossil specimens to compare anatomical features across these groups.

The analysis showed that Stromatoveris psygmoglena and seven key members of the Ediacaran biota share very similar anatomies, including multiple, branched fronds which radiate outwards like seaweed, uniting them all in a new group of early animals called Petalonamae.

Uniting these members of the Ediacaran biota and Stromatoveris psygmoglena in a single group of animals has major implications for animal origins. In light of this new evidence, some older ideas on early animal evolution may need to be revised. Because members of the Ediacaran biota can now be classed as animals, we can date the origin of the animal kingdom to at least the time when these fossils appeared. This means that animal species were diversifying well before the Cambrian explosion.

It may also mean that the search for animal origins should now focus on the time before this, in the early Ediacaran and even more ancient geological periods. Based on this, animals may have originated much earlier than the traditional reading of the fossil record had suggested.

The closest analogy I can come up with is Yahoo Answers. Quora aims to be the best place to find answers or knowledge about a topic.

They do this by having the community ask questions, and having the community answer it. A particular feature is that certain people have expertise in an area, so their answer should be given more weight. The analogy Quora likes to use is if Michael Jordan answers a question about basketball, its not the same if you or I answer the question though I do claim to know a lot about bball! Clearly, an expert that answers a question knows a lot more about the topic.

In addition, the community can vote up the answer similar to a forum. The community can also edit the question, summarize answers, categorize, etc…similar to wikipedia. Quora tries to use people with real profiles and real names. Right now, there a lot of interesting questions and insightful answers being posed like the above pic.

Mostly, they have a tech skew because these are generally the first adopters of these kind of websites. The quality of the answers and the experts answering them are also really good.

You can see in the example above, one of the original co-founders of Firefox answered, then the current CEO, and a bunch of people that use to work there or developers that have worked with it.

So much of the web is uncategorised. When you search in google, you are presented with web pages that best match your keywords. What Quora is trying to do is create some sense of order in the web by having the community organise it, and giving priority to experts. The community also help shapes the answers by giving feedback. Here is an example of a question I answered on Yammer.

I corrected the person below who answered Blellow as a competitor. Yes, most people would see it as a competitor but its actually a different service.



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