Figure1.Tree suggesting possible evolutionary relationships among fossil and recent acipenseriforms. See text for explanation and
discussion. Biogeographic areas are keyed to the map in Figure 3, and our scheme of provinces is explained in the biogeography section of
the text. Fossils are preceded by dagger symbols; continents from which fossils were recovered are indicated. Life history pattern is keyed
as follows: A-anadromous; P-potamodromous; FWA-freshwater amphidromous. These terms are defined in the life history section of
the text. Data for relationships among acipenserines (Acipenserplus Huso) based on preliminary analyses by Birstein & DeSalle (1997).
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