Figure 15:
Scatterplot
of Xm versus Pwm for Jamaican dataset and selected other
populations (Drooger, 1952, 1993; Raju, 1974). This scatterplot
considers only morphology and not age of populations. Note the broad
Miogypsina field, with populations from the Americas occupying the whole
width of the field, yet those from Jamaica (a single carbonate platform) only
occupy the right-hand side of the field). Similar restrictions to parts of the
fields for Miogypsina
and Miogypsinoides are shown for populations from different
geographical areas (e.g., India and Neotethys).