TimeTree is a public knowledge-base for information on the evolutionary timescale of life. A search utility allows exploration of the thousands of divergence times among organisms in the published literature. A tree-based (hierarchical) system is used to identify all published molecular time estimates bearing on the divergence of two chosen taxa, such as species, compute summary statistics, and present the results . . . For those interested in published summaries of relationships and divergence times of major groups of organisms (family level and above), see the authoritative synthesis The Timetree of Life.

Here are some examples to get you started: Humans and Chimpanzees diverged 6.3 MYA; Giraffes and Dolphins diverged 58.3 MYA; Cats and Mice diverged 95.2 MYA; and Dogs and Fleas diverged 777.8 MYA. [more inside]
posted by troll on Oct 27, 2011 - 18 comments

"The ability to design and create new forms of life marks a turning-point in the history of our species and our planet." - Freeman Dyson, on the J.C. Venter Institute's creation of a cell controlled by a synthetic genome. We are now in the business of engineering life.
posted by BoatMeme on May 20, 2010 - 62 comments

How much life could you find in one cubic foot? With a 12-inch green metal-framed cube, photographer David Liittschwager (of the Endangered Species Project) surveyed biodiversity in land, water, tropical and temperate environments around the globe for National Geographic. At each locale he set down the cube and started watching, counting, and photographing with the help of his assistant and many biologists. The goal: to represent the creatures that lived in or moved through that space. The team then sorted through their habitat cubes and tallied every inhabitant, down to a size of about a millimeter. [more inside]
posted by zarq on Feb 2, 2010 - 25 comments

The Encyclopedia of Life [previously] is E.O. Wilson's dream become reality. It has been online since February of 2008, aiming to catalog the currently known 1.9 million species on our planet. You can also add text, images, video, comments, and tags. [ FAQ • Video Introduction • Tutorials ]
posted by not_on_display on Jan 30, 2010 - 10 comments

The amazing story of the coelacanth is one of the wonders of the living world that inspires marine biologists such myself. Coelacanths, part of the offshoot lineage of fishes known as "lobed finned ", are very different from typical "ray finned" fishes that you usually think of. Their bizarre lobed fins are thought to be an intermediate step between fish fins and amphibian legs. Scientists had known that these weird fish existed because of fossils for over a century, but we believed that they went extinct 65 million years ago... until a South African fisherman caught one in 1938. [more inside]
posted by WhySharksMatter on Sep 7, 2009 - 49 comments

What Invasive Species Are Trying to Tell Us. "Walking snakeheads, carnivorous snails, and the superpredator from the reef: The invasion has begun." [Via]
posted by homunculus on Feb 16, 2009 - 46 comments

What Is A Species? "To this day, scientists struggle with that question. A better definition can influence which animals make the endangered list."
posted by homunculus on Jun 8, 2008 - 11 comments

Dude, there are some fucked up creatures crawling around on the ocean floor.
posted by goodnewsfortheinsane on Dec 5, 2006 - 66 comments

The Endangered Species Act marked its 30th anniversary this December. Some say we need it while others say we need to change it. Whatever its faults, many species have benefited from it.
posted by homunculus on Dec 30, 2003 - 5 comments

The All Species Inventory is a non-profit organization dedicated to the complete inventory of all species of life on Earth within the next 25 years - a human generation. It's an interesting project, based on open-source ideology (check out their "Principles") but seems to be limiting itself to strictly Linnaean methods.
posted by Irontom on Sep 23, 2002 - 10 comments

We're finding new fauna in some of the most heavily-populated areas on earth. It sort of makes you wonder what how many species we never even know about as we slash and burn great hunks of the rain forests, wooded areas, and other biodiverse areas of the world. (And good grief, those bugs are huge!)
posted by mrmanley on Apr 5, 2002 - 9 comments