One of the best things that can happen to a fossil is to get strained, and in such a way that the fundamental symmetry (if it once had it) is systematically altered. This is what has happened here. The distorted angles give insight regarding shear strain of not only the fossil, but the rock in which it was enclosed.
The Tucson Gem and Mineral Show. My student, friend, and professional colleague, Alex Bump, spotted it and gave it to me as a gift. I’d like to show it around.