Figure 5 in The beetles of the Lesser Antilles (Insecta, Coleoptera): diversity and distributions

Figure 5. The larger and sometimes connected paleo-islands of the eastern West Indies at times of maximum low sea levels during the last glacial, about 26,000 to 20,000 yBP. Some of the present islands of the Lesser Antilles thus had considerably larger areas and were joined with other islands on their marine bank as continuous land, and the islands were closer to each other. The glacial low sea levels approximated the insular shelf margins. The isobath (depth) line is shown here at -200 m below the present sea level. The evidence for sea level depression in the last glacial is for a decrease of as much as -150 m (Clark et al. 2009). The larger island areas are the exposed submarine banks that represent the true biogeographic islands that were isolated from each other. Note that some of the islands paralleling the north coast of South America were still isolated by seawater and were thus oceanic islands, even though they lie on or near the continental shelf of South America.