Holectypoida
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: | |
|---|---|
| Echinoneus cyclostomus | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Superorder: | |
| Order: | Holectypoida Duncan, 1889 |
| Family: | Echinoneidae Agassiz, 1847 |
| Genera | |
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Echinoneus | |
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