title: EVOLUTION. One era you are in—the next you are out.
authors.affiliation: Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA. wagnerpj@si.edu.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Wagner
mesh_terms: D000818:Animals; D005075:Biological Evolution; D049628:Body Size; D005399:Fishes / Q000033:anatomy & histology*