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Darwin 200: the celebration continues... read more

Explore the ToL links Explore the root of the Tree of Life Explore fungi Explore terrestrial vertebrates (amphibians, reptiles, birds, mammals, etc.) Explore animals Explore flowering plants Explore organisms with nucleated cells Explore arthropods (insects, spiders, crustaceans, etc.)

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Angiosperms (flowering plants) image info

The angiosperms, or flowering plants, are one of the major groups of extant seed plants...read more

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The Tree of Life Web Project (ToL) is a collaborative effort of biologists and nature enthusiasts from around the world. On more than 10,000 World Wide Web pages, the project provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny).

Each page contains information about a particular group, e.g., salamanders, segmented worms, phlox flowers, tyrannosaurs, euglenids, Heliconius butterflies, club fungi, or the vampire squid. ToL pages are linked one to another hierarchically, in the form of the evolutionary tree of life. Starting with the root of all Life on Earth and moving out along diverging branches to individual species, the structure of the ToL project thus illustrates the genetic connections between all living things.

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portrait of Charles Darwin at age 72

"The affinities of all the beings of the same class have sometimes been represented by a great tree... As buds give rise by growth to fresh buds, and these if vigorous, branch out and overtop on all sides many a feebler branch, so by generation I believe it has been with the great Tree of Life, which fills with its dead and broken branches the crust of the earth, and covers the surface with its ever branching and beautiful ramifications."

Charles Darwin, 1859
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Image of rose © 1999 Nick Kurzenko. Image of annelid worm © 2001 Greg W. Rouse.

The Tree of Life Web Project is hosted by The University of Arizona College of Agriculture and Life Sciences and The University of Arizona Library