title: Evolutionary biology: light on ancient photoreceptors.
authors.forename: Thurston
authors.initials: T
authors.lastname: Lacalli
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005123:Eye / Q000033:anatomy & histology / Q000648:ultrastructure; D009799:Ocular Physiological Phenomena; D017956:Photoreceptor Cells, Invertebrate / Q000502:physiology* / Q000648:ultrastructure; D011077:Polychaeta / Q000033:anatomy & histology / Q000502:physiology* / Q000648:ultrastructure