| Dendrasteridae | |
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Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Clypeasteroida |
| Suborder: | Scutellina |
| Family: | Dendrasteridae |
Dendrasteridae is a family of echinoderms belonging to the order Clypeasteroida. [1]
Genera: [1]
Sand dollars are species of flat, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. Sand dollars can also be called "sand cakes" or "cake urchins".
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.
Dendraster ashleyi is an extinct species of sand dollars of the family Dendrasteridae. Fossil of this species have been found in the Pliocene of California, about 5 Mya. They reach a diameter of about 3.5 cm.
Dendraster gibbsii is an extinct species of sand dollars of the family Dendrasteridae. Fossil of this species have been found in the Pliocene of California. They reach a diameter of about 3.5 cm.
The Neognathostomata are a superorder of sea urchins.
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