sulzeri, Jince formation, Czechoslovakia. Pete Lawrance
collection. Although eyes are normally an extremely important
survival feature, there are situations under which loss of eyes
might occur. For example, trilobites that took advantage of
deep-water benthic (bottom-feeding) habitats where light was
dim or lacking might have gradually lost their eyes without
suffering an adaptive disadvantage. Such eyeless trilobite assemblages
are called atheloptic.