Trilobites are extinct arthropods that dominated the faunas of the Paleozoic Era. Since their appearance 523 million years ago, they were equipped with elaborate compound eyes. While most of them possessed apposition compound eyes, comparable to the compound eyes of many crustaceans and insects living today, trilobites of the suborder Phacopina that lived 390 million years ago developed the so-called schizochroal eyes — atypical large eyes with...
