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A sand dollar digging into the sand on the Playa Novillero beach at low tide on the Pacific coast of Mexico Spines on the underside of a sand dollar on the beach at Hilton Head Island, South Carolina. Sand dollars can be found in temperate and tropical zones along all continents. [6]
Dendraster excentricus, also known as the eccentric sand dollar, sea-cake, biscuit-urchin, western sand dollar, or Pacific sand dollar, is a species of sand dollar in the family Dendrasteridae. It is a flattened, burrowing sea urchin found in the north-eastern Pacific Ocean from Alaska to Baja California .
Echinarachnius parma, the common sand dollar, is a species of sand dollar native to the Northern Hemisphere. [1] Subspecies. Echinarachnius parma obesus H.L. Clark, 1914; Echinarachnius parma parma (Lamarck, 1816) Echinarachnius parma sakkalinensis Argamakowa, 1934
Keyhole sand dollar refers to five living species of sand dollars in the genus Mellita, plus the extinct †Mellita aclinensis.They are found on the Atlantic coasts of the Americas, ranging across the Caribbean Islands (e.g. Bermuda, Jamaica and Puerto Rico), from the southern United States at the north, to the southeastern coast of Brazil at the south.
Encope emarginata has a thick test, or shell, that often remains intact and preserved. [1] Tests are oval-shaped, centrally domed, typically greenish-brown colored, and have 6 lunules, or notches, as well as large bowed petaloids [2] Young E. emarginata can be mistaken for its sibling, E. michelini, because of the presence of open lunules as juveniles, although closed as adults.
Leodia sexiesperforata, commonly known as the six-holed keyhole urchin, [2] is a species of sand dollar, in the echinoderm order Clypeasteroida. It is native to tropical and sub-tropical parts of the western Atlantic Ocean where it buries itself in soft sediment in shallow seas.
Dendraster is a genus of sand dollars of the family Dendrasteridae [2] within the order Clypeasteroida. The extant species in this genus are found in the northeast Pacific Ocean from Alaska to Baja California. [3] The best-known, most common and widespread species is D. excentricus. [3]
Heliophora orbicularis, also known as the West African Sand Dollar, is a small sand dollar in to the family Rotulidae, and the only species in the genus Heliophora. It, and other members of Rotulidae have been found in West African marine strata from the Late Miocene onward. Like the related Rotula , it is still extant.