Number of Species

[paux]

Hi, my zoology prof is giving a small amount of extra credit to any student in his class that can find a diagram (like the one shown below) with updated species counts. I can't find anything quite as thorough as the original diagram, so I was hoping to simply update the numbers. Does anyone know a good source for finding this information (the number of species in the major classes of chordata)?

Hope you can help. Thanks so much!


Larger image here: http://i161.photobucket.com/albums/t234/pauxcide/chordates.jpg

[Francis73]

Let me tell you, the recent report says that, There are 8.7 million eukaryotic species on our planet — give or take 1.3 million. The latest biodiversity estimate, based on a new method of prediction, dramatically narrows the range of 'best guesses', which was previously between 3 million and 100 million. It means that a staggering 86% of land species and 91% of marine species remain undiscovered.