Podilymbus

Podilymbus is a genus of birds in the Grebe family, containing the extinct Atitlán grebe ("Podilymbus gigas") and the pied-billed grebe ("Podilymbus podiceps"). The genus name is derived from Latin "Podilymbus", a contraction of "podicipes" ("feet at the buttocks", from "podici-", "rump-" + "pes", "foot")—the origin of the name of the grebe order—and Ancient Greek "kolymbos", "diver".
There are also several prehistoric taxa of "Podilymbus" described from fossil remains: