Riva, the iconic Italian boat builder and a subsidiary of the Ferretti Group, launched its new flagship model, the Riva Mythos, in mid-March. In terms of design, the 122-foot yacht is a larger-scale continuation of Riva’s Domino 86 model, which debuted in 2009. The Mythos is only the brand’s second new model since the launch of the Riva Iseo in mid-2011. (The Riva 63 Virtus launched in 2012.) The new yacht, whose hull and superstructure are made entirely from aluminum, features a design from Mauro Micheli, the…