(no subject)
It's such a pretty fossil.
Here are some nifty tidbits about it, courtesy of Pharyngula.
Age. It's 47 million years old. That's interestingly old…it puts us deep into the primate family tree.
Preservation. This is an awesome fossil: it's almost perfectly complete, with all the bones in place, preserved in its death posture. There is a halo of darkly stained material around it; this is a remnant of the flesh and fur that rotted in place, and allows us to see a rough outline of the body and make estimates of muscle size. Furthermore, the guts and stomach contents are preserved. Ida's last meal was fruit and leaves, in case you wanted to know.
Life stage. Ida is a young juvenile, estimate to be right on the transition from requiring parental care to independent living. That means she has a mix of baby teeth and adult teeth - she's a two-fer, giving us information about both.
Phylogeny. A cladistic analysis of the fossil revealed another interesting point. There are two broad groups of primates: the strepsirrhines, which includes the lemurs and lorises, and the haplorhines, which includes monkeys and apes…and us, of course. Ida's anatomy places her in the haplorhines with us, but at the same time she's primitive. This is an animal caught shortly after a major branch point in primate evolutionary history.
For those interested, here is its' internet publication.
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0005723
Has more pictures, too. :)