File this under "not a dinosaur, but too cool not to share." Andrew Scott, known as Bugmaker at Flickr, creates wonderful trilobite models, including some "preserved" in jars.
Reminds me of my old crayfish, Sylvester. After I went fishing with a friend and her dad without permission, my parents had Sylvester, my only catch of the day, preserved in a jar. He stayed on the shelf above my bed for years.
When I look back on it, that was a really weird punishment. Check out Andrew's blog, too.