Six-Keyhole Sand Dollar

Leodia sexiesperforata

Leodia sexiesperforata is a flattened, radially symmetrical sand dollar, typically measuring between 4.8 and 14.5 cm in diameter. Its circular or semi-pentagonal shape is complemented by secondary bilateral symmetry. The upper surface features five short, petal-like areas that function as gills and six oval lunules, which contribute to its common name. The body is covered in small spines, giving it a velvety appearance, and it usually presents shades of yellowish-brown or pale brown. This species inhabits the tropical and sub-tropical regions of the western Atlantic Ocean, with a distribution stretching from North Carolina to Uruguay. It prefers sandy habitats with minimal seagrass or algal growth, typically found at depths up to 60 m, although it is most commonly encountered at shallower depths. Leodia sexiesperforata buries itself in soft sediment, often to a depth of about 2.5 cm, and can do so quickly, in approximately five to seven minutes. Feeding primarily on detritus and small organic particles, it uses its tube feet to collect food, which is then transported to its mouth via food grooves. Reproduction involves external fertilization, with brooding observed where eggs are held on the peristome or around the periproct. The species is not currently evaluated for conservation status.