Leodia sexiesperforata, commonly known as the six-holed keyhole urchin,[2] is a species of sand dollar, in the echinoderm order Clypeasteroida.

Like other sand dollars, Leodia sexiesperforata is radially symmetrical and flattened dorso-ventrally, having a circular or semi-pentagonal shape, but it also displays secondary, front-to-back bilateral symmetry.

On the aboral (upper) surface of the test are five short, petal-like areas which are used as gills and six oval lunules (slots) which give the species its name "sexiesperforata".

[2] The purpose of the lunules may be to equalise pressure above and below the sand dollar, thus reducing lift and helping prevent it from being washed away by strong currents.

[5] It feeds on detritus and small organic particles, picking them up with the tube feet on the oral surface, moving them to the food grooves and thence to the mouth, where they are ground up by the teeth.