title: Evolutionary biology: Body plans and simple brains.
authors.forename: Thurston
authors.initials: T
authors.lastname: Lacalli
mesh_terms: D000818:Animals; D005075:Biological Evolution; D019521:Body Patterning; D002490:Central Nervous System / Q000196:embryology*; D007448:Invertebrates / Q000196:embryology*; D009415:Nerve Net / Q000196:embryology*; D014714:Vertebrates / Q000196:embryology*