Figure 2: Hachured regions show the distribution of modern marine waters with dissolved O2 < 0~4 mL/L (After Deuser, 1975). Shaded areas show characteristic species endemic to oxygen-poor waters in the eastern tropical Pacific (After Brinton, 1980). E. exima (vertical lines). E.distinguenda (slanted lines). Projection is Goode's Homosline equal-area, copyright, University of Chicago. (Prom Berry et al., 1987, with permission of Geological Society of Denmark, copyright, 1987).