Megalops atlanticus (Cuvier and Valenciennes 1847; up to 2.5m) is the extant Atlantic tarpon. Traditionally considered a relative of eels, here Megalops nests between Amia , the bowfin, and Thunnus, the tuna.
Megalops has large eyes, numerous tiny teeth and large fins. Like Amia, sometimes Megalops uses its swim bladder as a lung by gulping air
The growth series (left) appears to recapitulate the evolution of Megalops from an Amia-like ancestor. Note the late appearance of pectoral and pelvic fins.
The two bones on top of the maxilla evolved from former gill bars.
This is the first bony fish in this lineage, convergent with bony fish in the lobe fin line. The maxilla is loose, as in Amia. |
