Figure 5
From: The evolutionary history of manatees told by their mitogenomes
Schematic figure to show the evolution of the Amazon drainage pattern, based on Albert et al. (2018). (a) Early and Middle Miocene (20.4–9.0 Ma): Potamosiren (P) present in Magdalena basin based on Domning (1982), and fossil described during this period66; (b) Late Miocene (9.0–5.3 Ma): Trichechus-like sirenians (T) presumed to be present in the Amazon basin and South America Coast as suggested by Domning (1982), and fossil described by Beatty et al. (2012); (c) Middle Pliocene—Recent (c. 4.5–0 Ma): the possible occurrence of modern Trichechus species T, and a new species of Trichechus described recently by Perini et al. (2020).
