. . "Litopterna (from Ancient Greek: \u03BB\u1FD1\u03C4\u03AE \u03C0\u03C4\u03AD\u03C1\u03BD\u03B1 \"smooth heel\") is an extinct order of fossil hoofed mammals (ungulates) from the Cenozoic period that displayed toe reduction \u2013 three-toed forms developed; there was even a one-toed horselike form."@en . . . "Litopterna"@en . . . .