The Holectypoida are an order of sea urchins related to the sand dollars. The order consists of just two living genera, but was once more diverse.
Holectypoida Temporal range: | |
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Echinoneus cyclostomus | |
Scientific classification | |
Kingdom: | |
Phylum: | |
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Order: | Holectypoida Duncan, 1889 |
Family: | Echinoneidae Agassiz, 1847 |
Genera | |
Echinoneus |
In appearance, the living holectypoids are similar to sand dollars, but with less flattened bodies and an oval outline. They also lack the petal-like patterns found on the bodies of sand dollars.
According to World Register of Marine Species :
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