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There are about species of sand dollar. They are classified as echinoderms in the order Clypeasteroida. They are essentially extremely flattened, burrowing sea urchins.
Source(s): http://en.wikipedia.org/wiki/Sand_dollar
http://animaldiversity.ummz.umich.edu/accounts/Ech…
http://animaldiversity.ummz.umich.edu/accounts/Ech…
http://www.marinespecies.org/echinoidea/aphia.php?…
Species name? That all depends on which species you are referring to. Sand dollars are Echinoderms, like sea urchins.
Source(s): Biologist
The generic name is Echenis, specific name depends upon the particular species.
Source(s): Invertebrata by L.H.Hymen.