A newly-described genus and species of trilobite is a unique example of an animal changing the form and apparent function of one of its morphological features to overcome a problem, while modifying the form and function of another feature to satisfy the function of the original feature. The Silurian trilobite Waukeshaaspis eatonae, from the Silurian Waukesha Biota of Wisconsin, USA. Image credit: Kenneth Gass, specimen deposited in the University...
