A bit more. . . .

Neptune fountain -- Bologna

Although the Boboli fountain is named everywhere "The Bacchus Fountain" and Pietro clearly liked to pose for the Bacchus bronzes, I agree with James Holderbaum that likely the pose on the turtle is a play on the Neptune theme favored at the time, rather than the Bacchus one. How early is the mixup? No way to know.

"But the real stroke of Florentine wit is the pose: The familiar gesture of a hundred fountain statues of Neptune who imperiously raises his hand to still the waters, the Vergilian Quos Ego; the Duke's ludicrous little jester travesties the mighty lord of the sea. This was a joke sure to amuse the sixteenth-century mind, and especially topical for Florentines in 1564, only three years after the great Neptune fountain competition which Ammannati had won -- at that moment he was completing the colossal marble for the Piazza -- and at a time when Giovanni Bologna was beginning his bronze giant for the Neptune fountain in Bologna."